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september 2008 rev 6 1/27 1 L9352B intelligent quad (2 x 5a / 2 x 2.5a) low-side switch features quad low-side switch 2 x 5 a designed as conventional switch 2 x 2.5 a designed as switched current- regulator low on-resistance 4 x 0.2 (typ.) powerso-36 - package with integrated cooling area integrated free-wheeling and clamping z- diodes output slope control short circuit protection selective overtemperature shutdown open load detection ground and supply loss detection external clock control recirculation control regulator drift detection regulator error control status monitoring status push-pull stages electrostatic discharge (esd) protection description the L9352B is an integrated quad low-side power switch to drive inductive loads like valves used in abs systems. two of the four channels are current regulators with current range from 0 ma to 2.25 a. all channels are protected against fail functions. they are monitored by a status output. powerso-36 table 1. device summary order code package (1) 1. ecopack? package (see section 6: package information ). packing L9352B-lf powerso-36 tray L9352B-tr-lf powerso-36 tape and reel www.st.com www.datasheet.net/ datasheet pdf - http://www..co.kr/
contents L9352B 2/27 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.3 operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 input circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.3 output stages (not regulated) channel 1 and 2 . . . . . . . . . . . . . . . . . . . . 13 4.4 current-regulator-stages channel 3 and 4 . . . . . . . . . . . . . . . . . . . . . . . . 13 4.5 protective circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.6 error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.7 drift detection (regulated channels only) . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.8 other test modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 4.9 diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 5 timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.1 non regulated channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 5.2 regulated channels (timing diagrams of diagnostic with 2khz pwm input signal) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 7 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B list of tables 3/27 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 5. operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 6. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 7. error detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 8. special test mode functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 9. diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 10. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 www.datasheet.net/ datasheet pdf - http://www..co.kr/
list of figures L9352B 4/27 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. pins connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. input pwm to output current range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 4. current accuracy according to the input and clock frequency ratio . . . . . . . . . . . . . . . . . . 14 figure 5. output slope, resistive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 6. overload switch-off delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 7. normal condition, resistive load, pulsed input signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 8. current overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 figure 9. diagnostic status output at different open load current conditions . . . . . . . . . . . . . . . . . . . 21 figure 10. pulsed open load conditions (regulated and non-regulated channels) . . . . . . . . . . . . . . . . 22 figure 11. normal condition, inductive load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 figure 12. current overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 13. recirculation error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 14. current regulation error (e.g. as a result of voltage reduction) . . . . . . . . . . . . . . . . . . . . . . 24 figure 15. over temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 16. test mode 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 17. powerso-36 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . 25 www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B block diagram 5/27 1 block diagram figure 1. block diagram 99at0059 logic overload open load gnd-det. overtemperature channel 1 overtemperature channel 4 logic & da overload open load gnd-det. ipd ipd logic overload open load gnd-det. overtemperature channel 2 overtemperature channel 3 logic & da overload open load gnd-det. ipd ipd drift-det. vs vcc vdd q1 d4 q4 q2 d3 q3 gnd test st3 in3 st2 in2 st4 in4 st1 in1 clk en internal supply www.datasheet.net/ datasheet pdf - http://www..co.kr/
pins description L9352B 6/27 2 pins description figure 2. pins connection (top view) table 2. pins description n pin description 1 gnd logic ground 2, 3 pgnd3 power ground - channel 3 4, 5 q3 power output - channel 3 6, 7 d3 free-wheeling diode - channel 3 8, 9 q1 power output - channel 1 10, 11 q2 power output - channel 2 12, 13 d4 free-wheeling diode - channel 4 14, 15 q4 power output - channel 4 16, 17 pgnd4 power ground - channel 4 18 nc not connected 19 vcc 5 v supply 20 vdd 5 v supply 21 st4 status output - channel 4 22 in2 control input - channel 2 23 in4 control input - channel 4 24 st2 status output - channel 2 25 en enable input for all four channels 36 n.c. 35 in3 st4 34 pgnd3 33 32 pgnd3 q3 31 q3 30 29 d3 d3 28 q2 27 26 q2 pgnd2 25 pgnd2 24 23 vs vdd 22 vcc 21 20 in2 st1 19 gnd 1 in4 2 3 st3 pgnd4 4 pgnd4 5 6 q4 q4 7 d4 8 9 d4 q1 10 q1 11 12 pgnd1 pgnd1 13 en 14 15 clk in1 16 st2 17 18 test 99at0060 www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B pins description 7/27 26 test enable input for drift detection 27, 28 pgnd2 power ground - channel 2 29 vs supply voltage 30, 31 pgnd1 power ground - channel 1 32 st1 status output - channel 1 33 in3 control input - channel 3 34 in1 control input - channel 1 35 st3 status output - channel 3 36 clk clock input table 2. pins description (continued) n pin description www.datasheet.net/ datasheet pdf - http://www..co.kr/
electrical specifications L9352B 8/27 3 electrical specifications 3.1 absolute maximum ratings the absolute maximum ratings are the limiting values for this device. warning: damage may occur if this device is subjected to conditions which are beyond these values. table 3. absolute maximum ratings symbol parameter test co nditions min typ max unit e q switch off energy for inductive loads 50 mj voltag es v s supply voltage -0.3 40 v v cc , v dd supply voltage -0.3 6 v v q output voltage static 40 v v q output voltage during clamping t < 1ms 60 v v in , v en input voltage in1 to in4, en i i < |10|ma -1.5 6 v v clk input voltage clk -1.5 6 v v st output voltage status -0.3 6 v v d recirculation circuits d3, d4 40 v v drmax max. reverse breakdown voltage of free wheeling diodes d3, d4 55 v currents i q1/2 output current for q1 and q2 >5 internal limited a i q3/4 output current for q3 and q4 >3 internal limited a i q1/2 , i pgnd1/2 output current at reversal supply for q1 and q2 -4 a i q3/4 , i pgnd3/4 output current at reversal supply for q3 and q4 -2 a i st output current status pin -5 5 ma esd protection esd electrostatical discharging gnd, pgnd, qx, dx, clk, st, in, test, en mil883c 2 kv www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B electrical specifications 9/27 3.2 thermal data 3.3 operating range vs, vcc,vdd supply pins vs. gnd and pgnd 1 kv esd output pins (qx, dx) vs. common gnd (pgnd1-4 + gnd) 4 kv table 3. absolute maximum ratings (continued) symbol parameter test co nditions min typ max unit table 4. thermal data symbol parameter test conditions min typ max unit t j junction temperature t j -40 150 c t jc junction temperature during clamping (life time) t = 30min t = 15min 175 190 c t stg storage temperature t stg -55 150 c t th over temperature shutdown threshold (1) 175 200 c t hy over temperature shutdown hysteresis (1) 10 c r th j-case thermal resistance junction to case 2 k/w 1. this parameter will not be tested but assured by design. table 5. operating range symbol parameter test conditions min. typ. max. unit v s supply voltage 4.8 18 v v cc , v dd supply voltage 4.5 5.5 v dv s /dt supply voltage transient time -1 1 v/ s v q output voltage static -0.3 40 v v q output voltage induced by inductive switching voltage will be limited by internal z-diode clamping 60 v v st output voltage status -0.3 6 v i st output current status -1 1 ma t j junction temperature -40 150 c t jc junction temperature during clamping = 30min = 15min 175 190 c www.datasheet.net/ datasheet pdf - http://www..co.kr/
electrical specifications L9352B 10/27 3.4 electrical characteristics table 6. electrical characteristics (v s = 4.8 to 18v; t j = -40 to 150c unless otherwise specified) symbol parameter test condition min. typ. max. unit power supply i son supply current v s 18v (outputs on) 5ma i soff quiescent current v s 18v (outputs off) 5ma i cc supply current vcc (analog supply) v cc = 5v 5 ma i dd supply current vdd (digital supply) v dd = 5v f clk =0hz 5 a i dd supply current vdd (digital supply) v dd = 5v f clk =250khz 5 ma general diagnostic functions v qu open load voltage v s 6.5v (outputs off) 0.3 0.33 0.36 x v q v thgnd signal-gnd-loss threshold v cc = 5v 0.1 1 v v thpgl power-gnd-loss threshold v cc = 5v 1.5 2.5 3.5 v f clk,min clock frequency error 10 100 khz dc clke_low clock duty cycle error detection low f clk = 250 khz 33,3 45 % dc clke_high clock duty cycle error detection high f clk = 250 khz 55 66,6 % vs loss supply detection v cc = v dd = 5v 2 4.5 v additional diagnostic functions channel 1 and channel 2 (non regulated channels) i qu1,2 open-load current channel 1, 2 v s 6.5v 50 300 ma i qo1,2 over-load current channel 1, 2 v s 6.5v 5 7.5 9 a additional diagnostic functions channe l 3 and channel 4 (regulated channels) dc out output duty cycle error filtered with 10ms 90 100 % i qo3,4 overload current channel 3,4 v s 6.5v 2.5 5 8 a v rerr recirculation error shutdown threshold (open d3/d4) iout > 50ma 45 50 60 v pwm dout output pwm ratio during drift comparison v in3 = v in4 = pwm in v test = h -14.3 +14.3 % digital inputs (in1 to in4, ena, clk, test). the valid pwm-ratio for in3/in4 is 10% to 90% v il input low voltage -0.3 1 v v ih input high voltage 2 6 v v ihy input voltage hysteresis (1) 20 500 mv www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B electrical specifications 11/27 i i input pull down current v in = 5v, v s 6.5v 8 20 40 a digital outputs (st1 to st4) v stl status output voltage in low state (2)) i st 40 a00.4v v sth status output voltage in high state (2)) i st - 40 a2.53.45v i st -120 a23.45v r diagl r out + r dson in low state 0.3 0.64 1.5 k r diagh r out + r dson in high state 1.5 3.2 7.0 k power outputs (q1 to q4) r dson static drain-source on-resistance i q = 1a; v s 9.5v 0.2 0.4 w v f_250ma forward voltage of free wheeling path d3, d4 @250ma i d3/4 = -250ma 0.5 1.5 v v f_2.25a forward voltage of free wheeling path d3, d4 @2.25a i d3/4 = -2.25a 2.0 4.5 v r sens sense resistor = (v f_2.25a- v f_250ma )/2a 1w v z z-diode clamping voltage i q 100ma 45 60 v i pd output pull down current v en = h, v in = l 10 150 a i qlk output leakage current v en = l; v q = 20v 5 a timing t on output on delay time i q = 1a 0 5 20 s t off output off delay time channel i q = 1a 0 10 30 s t in3/4min minimum input register on time (3) 2 s t offreg output off delay time regulator 528 s t r output rise time i q = 1a 0.5 1.5 8 s t f output fall time i q = 1a 0.5 1.5 8 s t sf short error detection filter time f clk = 250khz dc = 50% (3) 48 s t lf long error detection filter time f clk = 250khz dc = 50% (3) 16 32 s t scp short circuit switch-off delay time (3) 430 s t d status delay time (3) 896 1024 s t re regulation error status delay time (3) (reg. channels only) 10 ms t dreg output off status delay time (3) (reg. channels only 528 s reg. current accuracy (reg. channels only) i q3/q4 maximum current dc = 90% 2 2.25 2.5 a table 6. electrical characteristics (continued) (v s = 4.8 to 18v; t j = -40 to 150c unless otherwise specified) symbol parameter test condition min. typ. max. unit www.datasheet.net/ datasheet pdf - http://www..co.kr/
electrical specifications L9352B 12/27 i q3/q4 current resolution input duty cycle 0.4% - 99% f clk = 2khz@ 0.00a i q3/q4 0.25a 0.25a i q3/q4 0.40a 0.40a i q3/q4 0.80a 0.80a i q3/q4 2.25a -8 25 10 6 6 ma % % % i q3/q4 min. quant. step 5 ma frequencies clk frequency crystal-controlled 250 khz input pwm frequency (reg. channels only) 2 khz 1. this parameter will not be tested but assured by design. 2. short circuit between two digital output s (one in high the other in low state) will lead to the defined result "low". 3. digital filtered with external clock, only functional test. table 6. electrical characteristics (continued) (v s = 4.8 to 18v; t j = -40 to 150c unless otherwise specified) symbol parameter test condition min. typ. max. unit www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B functional description 13/27 4 functional description 4.1 overview the L9352B is designed to drive inductive loads (relays, electromagnetic valves) in low side configuration. integrated active zener-clamp (for channel1 and 2) or free wheeling diodes (for channel 3 and 4) allow the recirculation of the inductive loads. all four channels are monitored with a status output. all wiring to the loads and supply pins of the device are controlled. the device is self-protected against short circuit at the outputs and over temperature. for each channel one independent push-pull status output is used for a parallel diagnostic function. channel 3 and 4 work as current regulator. a pwm signal on the input defines the target output current. the output current is controlled through the output pwm of the power stage. the regulator limit of 90% is detected and monitored with the status signal. the current is measured during recirculation phase of the load. a test mode compares the differences between the two regulators. this ?drift? test compares the output pwm of the regulators. by this feature a drift of the load during lifetime can be detected. 4.2 input circuits the input, clk, test and enable inputs, are active high, consist of schmidt triggers with hysteresis. all inputs are connected to pull-down current sources. 4.3 output stages (not re gulated) channel 1 and 2 the two power outputs (5a) consist of dmos-power transistors with open drain output. the output stages are protected against short circuit. via integrated zener-clamp-diodes the overvoltage of the inductive loads due to recirculation are clamped to typ. 52v for fast shut off of the valves. parallel to the dmos transistors there are internal pull-down current sources. they are provided to assure an open load condition in the off-state. with en=low this current source is switched off, but the open load comparator is still active. 4.4 current-regulator-stages channel 3 and 4 the current-regulator channels are designed to drive inductive loads. the target value of the current is given by the duty cycle (dc) of the 2 khz pwm input signal. the following figure shows the relation between the input pwm and the output current and the specified accuracy . www.datasheet.net/ datasheet pdf - http://www..co.kr/
functional description L9352B 14/27 figure 3. input pwm to output current range the on period of the input signal is measur ed with a 1mhz clock, synchronized with the external 250khz clock. for requested precision of the output current the ratio between the frequencies of the input signal and the external 250khz clock has to be fixed according to the graph shown in figure 4 . figure 4. current accuracy according to the input and clock frequency ratio the theoretical error is zero for f clk / f in = 125. if the period of the input signal is longer than 132 times the period of the clock the regulator is switched off. for a clock frequency lower than 100khz the clock control will also disable the regulator. for high precision applications the clock frequency and the input frequency have to be correlated. the output current is measured during the recirculation of the load. the current sense resistor is in series to the free wheeling diode . if this recirculation path is interrupted the regulator stops immediately and the status output remains low for the rest of the input cycle. the output period is 64 times the clock period. with a clock frequency of 250khz the output pwm frequency is 3.9khz. the output pwm is synchronized with the first negative edge of the input signal. after that the output and the input are asynchronous. the first period is 250 10 16 32 90 400 800 2250 io (ma) input pwm(%) 25 ma 10% 6% -8% to +6% d03at513 a -10% 5.6% 112.5 132 125 f clk / f in 0% current accuracy regulator switched off www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B functional description 15/27 used to measure the current. this means the first turn-on of the power is 256 s after the first negative edge of the input signal. as regulator a digital pi-regulator with the transfer function for: ki: and kp: 0.96 for a sampling time of 256s is realized. to speed up the current settling time the regulator output is locked to 90% output pwm until the target current value is reached. this happens also when the target current value changes and the output pwm reaches 90% during the regulation. the status output gets low if the target current value is not reached within the regulation error delay time of t re =10ms. 4.5 protective circuits the outputs are protected against current overload, over temperature, and power-gnd-loss. the external clock is monitored by a clock watchdog. this clock watchdog detects a minimal frequency f clk,min and wrong clock duty cycles. the allowed clock duty cycle range is 45% to 55%. the current-regulator stages are protected against recirculation errors, when d3 or d4 is not connected. all these error conditions shut off the power stage and invert the status output information. 4.6 error detection the status outputs indicate the switching state under normal conditions (status low = off; status high = on). if an error occurs, the logic level of the status output is inverted, as listed in the diagnostic table below. all external errors, for example open load, are filtered internally. the following table shows the detected errors, the filter times and the detection mode (on/off). 0.126 z1 ? -------------- - table 7. error detection on state en &in = high off state en &in = low filter time reset done by short circuit of the load x t sf en & in = ?low? for t d or t dreg open load (under voltage detection) xt lf timer t d open load (under current detection) xt sf timer t d overtemperature x t sf en & in = ?low? for t d or t dreg power-gnd-loss x x t lf in on: en & in = ?low? for t d or t dreg in off: timer t d signal-gnd-loss x x t lf timer t d www.datasheet.net/ datasheet pdf - http://www..co.kr/
functional description L9352B 16/27 en&in = low means that at least one between enable and input is low. for the inputs in=low means also no input pwm. for the regulator input period longer than t dreg and for the standard channel input period longer than t d . a detected error is stored in an error register. the reset of this register is made with a timer t d . with this approach all errors are present at the status output at least for the time t d . all protection functions like short circuit of the output, over temperature, clock failure or power-gnd-loss in on condition are stored into an internal ?fail? register. the output is then shut off. the register must be reset with a low signal at the input. a ?low signal? means that the input is low for a time longer than t d or t dreg for the related channel, otherwise it is interpreted as a pwm input signal and the register is left in set mode. signal-gnd-loss and vs-loss are detected in the active on mode, but they do not set the fail register. this type of error is only delayed with the standard timer t lf function. open load is detected for all four channels in on- and off-state. open load in off condition detects the voltage on the output pin. if this voltage is below 0.33 * vs the error register is set and delayed with t d . a sink current stage pull the output down to ground, with en high. with en low the output is floating in case of openload and the detection is not assured. in the on state the load current is monitored by the non-regulated channels. if it drops below the specified threshold value i qu an open load is detected and the error register is set and delayed with t d . a regulated channel detects the open load in the on state with the current regulator error detection. if the output pwm reaches 90% for a time longer than t re than an error occurs. this could happen when no load is connected, the resistivity of the load is too high or the supply voltage too low. a clock failure (clock loss) is detected when the frequency becomes lower than f clk,min . all status outputs are set on error and all power outputs are shut off. the status signals remain in their state until the clock signal is present again. a clock failure during power on of v cc is detected only on the regulated channels. the status outputs of the channel 1 and 2 are low in this case. supply-vs-loss x x t lf timer t d clock control x x no in on: en & in = ?low? for t d or t dreg in off: timer t d output voltage clamp active x (regulated channels) no in on: en & in = ?low? for t d or t dreg in off: timer t d table 7. error detection (continued) on state en &in = high off state en &in = low filter time reset done by www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B functional description 17/27 4.7 drift detection (regulated channels only) the drift detection is used to compare the tw o regulated channels during regulation. this ?drift? test compares the output pwm of the regulators. the resistivity of the load influences the output pwm. the approximated formula for the output current below shows the dependency of the load resistor to the output pwm. in this formula the energy reduction during the recirculation is not taken into account. the real output pwm is higher. the testmode is enabled with in, en and test high. with an identical 2khz pwm-signal connected to the in-inputs the output pwm must be in a range of 14.3%. if the difference between the two on-times is more than 14.3% of the expected value an error is detected and monitored by the status outputs, in the same way as described above, but a drift error will not be registered and also not delayed with t d as other errors. drift definition: drift = pwm(1+e) - pwm (1-e) = 2pwm e drift * 4 < pwm (1+e) with e >14.3% a drift is detected e.. not correlated error of the channels %pwm ... corresponding ideal output pwm to a given input pwm a 7bit output-pwm-register is used for the comparison. the register with the lower value is subtracted from the higher one. this result is multiplied by four and compared with the higher value. 4.8 other test modes the test pin is also used to test the regulated channels in the production. with a special sequence on this pin the power stages of the regulated channels can be controlled direct from the input. no status feedback of the regulated channels is given. the status output is clocked by the regulator logic. the output sequence is a indication of a proper logic functionality. the following table shows the functionality of this special test mode. for more details about the test condition four see timing diagram. iout vbat rl ron + --------------------------- - pwm ? = table 8. special test mode functionality en in test out status note 1 x x x x disable test mode 1 1 1 on 1 drift mode 0 x off test pattern test condition one 0 x off test pattern test condition two 0 x off test pattern test condition three 0 0 off test pattern test condition four 0 1 on test pattern test condition four www.datasheet.net/ datasheet pdf - http://www..co.kr/
functional description L9352B 18/27 4.9 diagnostic the status follows the input signal in normal operating conditions. if any error is detected the status is inverted. table 9. diagnostic operating condition test input test enable input ena control input non-reg./reg. in power output/ current reg. q status output st normal function l l l l l l h h l h/pwm l h/pwm off off off on l l l h open load or short to ground l l l l l l h h l h/pwm l h/pwm off off off on x x h l overload or short to supply latched overload reset latch reset latch l l l l h h h ?> l h h/pwm h/pwm x h/pwm ?> l off off off off l l l l overtemperature latched overtemperature reset latch reset latch l l l l h h h ?> l h h/pwm h/pwm x h/pwm ?> l off off off off l l l l recirculation error (reg.chn.) latched error reset latch reset latch l l l l h h h ?> l h pwm pwm x pwm ?> l off off off off l l l l clock failure (clock loss) (1) l l l l l l h h l h/pwm l h/pwm off off off off h h h l drift (2) failure no failure h h h h l l h h l h/pwm h/pwm h/pwm off off on on x x l h 1. during power on sequence only detect ed on channel 3 and 4 (see description). 2. this input combination is also used for an internal chip-test and must not be used. www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B timing diagrams 19/27 5 timing diagrams 5.1 non regulated channels figure 5. output slope, resistive load figure 6. overload switch-off delay 99at0061 t v i v ih v il t v q t on t f v s t off t r 15% v s 85% v s 00rs0001 t i q i qo i qu t v st t d t scp t sf www.datasheet.net/ datasheet pdf - http://www..co.kr/
timing diagrams L9352B 20/27 figure 7. normal condition, resist ive load, pulsed input signal figure 8. current overload 99at0063 v in v q i q i qu t d v st t d 99at0064 v in v q i q i qo v st t d t d reset fail register set fail register www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B timing diagrams 21/27 figure 9. diagnostic status output at different open load current conditions 99at0065 v in v q i qu v st t d i q t d under current condition followed by normal operation 99at0066 v in v q i q i qu v st t d t d open load condition in the case of pulsed input signal followed by normal operation www.datasheet.net/ datasheet pdf - http://www..co.kr/
timing diagrams L9352B 22/27 figure 10. pulsed open load conditions (regulated and non-regulated channels) 5.2 regulated channels (timing diagrams of diagnostic with 2khz pwm input signal) figure 11. normal condition, inductive load 99at0067 v in v q 0.33 x v s v st t d i q t lf t lf 99at0068 v in v q i q t dreg v st 500 s target current 256 s 256 s www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B timing diagrams 23/27 figure 12. current overload figure 13. recirculation error 99at0069 v in v q i q v st i qo set fail registor reset fail register t dreg 500 s t sf 99at0070 v in v q i q v st target current set fail register reset fail register t dreg 500 s www.datasheet.net/ datasheet pdf - http://www..co.kr/
timing diagrams L9352B 24/27 figure 14. current regulation error (e.g. as a result of voltage reduction) figure 15. over temperature figure 16. test mode 4 99at0071 v in v st 500 s t re target current pwm ratio = 90% v q i q 99at0072 v in v st 500 s target current v q t dreg reset fail register overtemperature condition set fail register i q 99at0073 v test v in3/4 v q3/4 test mode 4 v en low www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B package information 25/27 6 package information in order to meet environmental requirements, st (also) offers these devices in ecopack ? packages. ecopack ? packages are lead-free. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com. figure 17. powerso-36 mechanical data and package dimensions outline and mechanical data dim. mm inch min. typ. max. min. typ. max. a 3.60 0.1417 a1 0.10 0.30 0.0039 0.0118 a2 3.30 0.1299 a3 0 0.10 0.0039 b 0.22 0.38 0.0087 0.0150 c 0.23 0.32 0.0091 0.0126 d 15.80 16.00 0.6220 0.6299 d1 9.40 9.80 0.3701 0.3858 e 13.90 14.5 0.5472 0.5709 e1 10.90 11.10 0.4291 0.4370 e2 2.90 0.1142 e3 5.80 6.20 0.2283 0.2441 e 0.65 0.0256 e3 11.05 0.4350 g 0 0.10 0.0039 h 15.50 15.90 0.6102 0.6260 h 1.10 0.0433 l 0.8 1.10 0.0315 0.0433 n 10? (max) s 8? (max) note: ?d and e1? do not include mold flash or protusions. - mold flash or protusions shall not exceed 0.15mm (0.006?) - critical dimensions are "a3", "e" and "g". powerso-36 0096119 c www.datasheet.net/ datasheet pdf - http://www..co.kr/
revision history L9352B 26/27 7 revision history table 10. document revision history date revision changes 20-feb-2004 5 initial release. 05-sep-2008 6 document reformatted. updated the order codes in table 1: device summary . www.datasheet.net/ datasheet pdf - http://www..co.kr/
L9352B 27/27 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2008 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com www.datasheet.net/ datasheet pdf - http://www..co.kr/

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