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Ordering number : EN5657
Monolithic Digital IC
LB1862M
Single-Phase Full-Wave Driver for Fan Motors
Overview
The LB1862M is a single-phase full-wave driver provided in a miniature package that is optimal for driving miniature fans such as CPU cooling fans. It provides motor drive with low switching noise and high efficiency.
Package Dimensions
unit: mm 3086A-MFP10S
[LB1862M]
Functions
* Supports both 5- and 12-V power supplies. * Allows the use of reverse connection prevention diodes by including a regeneration circuit on chip. * On-chip Hall amplifier with hysteresis characteristics (Supports commutator-free cores.) * Lock protection and automatic recovery circuits * Lock detection pin (Latch type - Low: drive, High: stopped) * Supports low current drain in standby mode by providing a Hall bias pin and a start/stop pin. * Thermal shutdown circuit
SANYO: MFP10S
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Supply voltage Output current Output voltage RD output voltage RD output current HB output current ST input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IOUT max VOUT max VR max IR max IB max VST max Pd max Topr Tstg When mounted on the specified board * Conditions Ratings 17 0.5 15 15 5 10 15 850 -20 to +75 -55 to +150 Unit V A V V mA mA V mW C C
Note: * Specified board: 114.3 x 76.2 x 1.5 mm epoxy glass laminate board
Allowable Operating Ranges at Ta = 25C
Parameter Supply voltage ST input high-level voltage ST input low-level voltage Hall input common-mode input voltage range Symbol VCC STH STL VICM Conditions Ratings 3.8 to 16.8 3 to 14 -0.3 to +0.4 0.2 to VCC -1.5 Unit V V V V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73097HA(OT) No. 5657-1/6
LB1862M Electrical Characteristics at Ta = 25C, VCC = 5 V
Parameter Symbol Conditions During drive operation (CT = low, ST = low) Current drain ICC ICT1 ICT2 RCT VCT1 VCT2 VOL VOH VHN VRD IRDL VHBL IST IO = 200 mA IO = 200 mA Zero peak value (Including the offset and hysteresis.) IRD = 5 mA VRD = 15 V IHB = 5 mA VST = 5 V 1.0 75 3.9 RCD = ICT1/ICT2 During lock protection (CT = high, ST = low) Standby mode (ST = high) Lock detection capacitor charge current Capacitor discharge current Capacitor charge/discharge current ratio CT charge voltage CT discharge voltage Output low-level voltage Output high-level voltage Hall input sensitivity RD output pin low-level voltage RD output pin leakage current HB output low-level voltage ST pin input current 1.9 0.32 5.0 2.55 1.6 Ratings min typ 6.5 2.2 110 2.8 0.46 6.0 2.75 1.8 0.2 4.1 7 0.1 15 0.3 30 1.3 100 max 9.1 3.1 150 3.7 0.60 7.0 2.95 2.0 0.3 V V V V mV V A V A Unit mA mA A A A
Truth Table
ST H IN- -- H L L IN+ -- L H L H CT -- OUT1 off H L off OUT2 off L H off L off L L Drive Lock protection RD off HB off Mode Standby
The RD output is a latch-type output; Low: drive, High: stopped
Pin Assignment
Top view
No. 5657-2/6
LB1862M Block Diagram
Charge/discharge circuit 0.47 to 1 F
Discharge pulse
Delay circuit Control circuit
Amplifier with hysteresis
Delay circuit
Thermal shutdown circuit
Start/stop
Sample Application Circuit
0.47 to 1 F
No. 5657-3/6
LB1862M Startup
Power applied
Lock Protection/Automatic Recovery
Lock Output on Lock cleared
Output off
Output off
Start/Stop
Output off
No. 5657-4/6
LB1862M Design Notes 1. VCC pin This pin provides power for motor drive and the control circuits. The LB1862M supports a wide range of operating voltages, from 3.8 to 16.8 V, and thus can be used in applications that support both 5-V and 12-V systems. 2. OUT1 and OUT2 pins Single-phase coil outputs. The output is a high side inverted, low side single bipolar output. Since a regeneration circuit is included on chip, the kickback current is regenerated across the low side NPN output even if a diode is used to protect the circuit against being destroyed by reversed polarity connection. 3. IN- and IN+ pins Hall element inputs. The Hall signal is amplified to be a square wave by the Hall amplifier, which has hysteresis characteristics. A hysteresis of 3.5 mV (typical) is applied. A Hall input signal amplitude of 70 mV or higher is recommended. 4. CT pin The capacitor connected between this pin and ground forms a protection circuit that prevents coil burnout if the motor locks. If the motor load returns to an appropriate level, the automatic recovery circuit will restart motor rotation. The lock detection time can be set by changing the value of the capacitor. If a 0.47 F capacitor is used: Lock detection time: About 0.5 second Lock protection time/automatic recovery time: About 0.16 second (output on) About 1 second (output off) This pin should be tied to ground if the lock protection function is not used. 5. RD pin This is an open collector output that is low while the motor is turning and high impedance when the locked state is detected. This is a latch type output that holds the output high-impedance state if motor rotation is not restarted by the automatic recovery circuit. 6. ST and HB pins ST pin: Stops motor drive when a high level is input. When ST is high, the RD pin output will go to the high-impedance state indicating lock protection mode. HB pin: Switches the Hall bias. When a high level is input to the ST pin, applications should switch the Hall bias to suppress standby mode current drain. Both these pins should be left open if unused. 7. Thermal shutdown circuit This circuit protects the IC by limiting the output current if the IC internal temperature reaches Tj = 180C.
No. 5657-5/6
LB1862M
Allowable power dissipation, Pdmax - mW
Ambient temperature, Ta - C
Current drain, ICC - mA
Supply voltage, VCC - V
Low side saturation output voltage, VO(sat)L - V
Output current, IO -- mA
Input current, IIN - A
Supply voltage, VST - V
VRD, VHB - IRD, IHB
HB
High side saturation output voltage, VO(sat)H - V
Output current, IO - mA
VRD, VHB - V
IRD, IHB - mA
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice. No. 5657-6/6

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