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| NJM2367 5.5A HIGH POWER DC/DC CONVERTER CONTROLLER IC sGENERAL DESCRIPTION The NJM2367 is a high power DC/DC converter controller inducing basic function of DC/DC converter controller, which consists precision reference voltage, fixed frequency oscillator, high gain error amplifier, precision output switch, cycle-by-cycle current limit, under voltage lockout, and thermal shutdown circuit. The NJM2367 is suitable for step-down converter with few external parts, and realize low power stand-by mode. sPACKAGE OUTLINE 12345 NJM2367TA2050 sFEATURES qOperating Voltage (7.5V to 40V) qPWM form Switching Power Supply Control qInternal High Power Transistor 5.5A (min.) qFixed Frequency Oscillator 72kHz (typ.) qInternal Current Sense Amplifier qInternal Under Voltage Lockout qInternal Thermal Shutdown Circuit qBipolar Technology qPackage Outline TO-22O(5PIN) NJM2367TLA2050 PIN FUNCTION 1:VFB 2:SW OUT 3:GND 4:V+ 5:STBY (VCOMP) sBLOCK DIAGRAM 5.5A Power Transistor Current Sense Amplifier Current Circh Transistor 4 2 Thermal Shutdown Reference Voltage ON/OFF VREF Oscillator S R Ratch Circuit Q Under Voltage Lockout Standby Circuit PWM Comparator VREF 1 Error Amplifier 5 3 Ver 2.1 - 1 - NJM2367 sABSOLUTE MAXIMUM RATINGS (Ta=25C ) PARAMETER SYMBOL Maximum Supply Voltage V+ Switch Output Voltage Vo (SWITCH) Voltage Feedback and VFB,VCOMP Compensation Input Voltage Range Power Dissipation PD Operating Junction Temperature Operating Temperature Range Storage Temperature Range Tj Topr Tstg RATINGS 40 -0.5 +Vin -0.3 +7.0 TO-220 (5PIN) 16(TC 46C) -40 +150 -40 +85 -50 +150 UNIT V V V W C C C sTHERMAL CHARACTERISTICS Junction-to-Ambient Temperature Thermal Resistance Junction-to-Case ja jc 70 6.5 C/W sPOWER DISSIPATION vs. AMBIENT TEMPERATURE (Topr=-40~+85C, Tj= ~+150C, PD=16W(TC 46C)) 18 16 Power Dissipation PD (W) 14 12 10 8 6 4 2 0 25 50 75 Ambient Temperature Ta (C) 100 Without Heat Sink HS=10C/W HS=5C/W Heat Sink HS=20C/W -2- NJM2367 sELECTRICAL CHARACTERISTICS (V+=12V, Ta=25C) OSCILLATOR BLOCK PARAMETER Frequency ERROR AMPLIFIER BLOCK PARAMETER Voltage Feedback Input Threshold Line Regulation Input Bias Current Ripple Rejection Output Voltage Swing SYMBOL fosc + TEST CONDITIONS V =7.5V MIN. 65 TYP. 72 MAX. 79 UNIT kHz SYMBOL VFB(th) REG*Line IB PSRR VOH VOL TEST CONDITIONS MIN. 4.9 TYP. 5.0 0.03 0.15 80 4.9 1.6 MAX. 5.1 0.08 1.0 - - 1.9 UNIT V %/V A dB V V V+=7.5 40V VFB=VFB(th)+0.15V V+=10 20V Isource=75A,VFB=4.7V Isink=0.4mA,VFB=5.3V - - - 4.2 - PWM COMPARATOR BLOCK PARAMETER SYMBOL Duty Cycle Maximum Minimum SWITCH OUTPUT BLOCK PARAMETER Output Voltage Saturation OFF-State Leakage Current Limit Threshold Switching Times Output Voltage Rise Time Output Voltage Fall Time DC(MAX) DC(MIN) TEST CONDITIONS VFB=0V VFB=5.3V MIN. - 0 TYP. 95 0 MAX. - 0 UNIT % % SYMBOL + TEST CONDITIONS MIN. - - 5.5 - - TYP. V -1.5 0 6.5 100 50 + MAX. V -1.8 100 8.0 - - + UNIT V A A nS nS VSAT V =7.5V,Isource=5.5A Isw(off) V+=40V,SW OUT=0V Ipk(SWITCH) V+=7.5V tr tf V+=40V,ROUT=7.7,VFB=0V V+=40V,ROUT=7.7,VFB=0V UNDER VOLTAGE LOCKOUT BLOCK PARAMETER SYMBOL Startup Threshold Hysteresis TOTAL DEVICE PARAMETER VTH(UVLO) VH(UVLO) + TEST CONDITIONS V Increasing V+ Decreasing MIN. 5.9 0.6 TYP. 6.3 0.8 MAX. 6.7 1.0 UNIT V V SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT A mA Standby-State Icc(stby) STBY 0.1V - 36 100 Power Supply Current Operating-State Icc V+=40V,VFB=0V - 40 53 Power Supply Current duty*cycle=MAX Keep the limit of maximum power dissipation not to operate thermal shutdown. Low duty cycle pulse test is used to close its junction temperature to ambient temperature. -3- NJM2367 sTIPICAL CHARACTERISTICS Switch Output Saturation Voltage vs. + Output Source Current (V =7.5V,Ta=25) Output Saturation Voltage VSAT(ERROR) (V) Error AMP Block Output Saturation Voltage vs. Output Source Current + (V =12V,VFB=5.5V,Ta=25C) 0 Switch Output Saturation Voltage VSAT (V) -0.5 -1 -1.5 -2 -2.5 -3 2 1.6 1.2 0.8 0.4 0 0 2 4 6 8 10 Output Source Current ISOURCE (A) 0 0.4 0.8 1.2 1.6 Output Sink Current ISINK (mA) Duty Cycle vs. Compensation Voltage + (V =12V,Ta=25C) 2 Standby-State Power Supply Current ICC(stby) (A) 150 120 90 60 30 0 Standby-State Power Supply Curret vs. Supply Voltage (Ta=25C) 100 Duty Cycle DC (%) 80 60 40 20 0 0 5 10 15 20 25 30 35 + Supply Voltage V (V) 40 0 1 2 3 4 5 Compensation Voltage VCOMP (V) -4- NJM2367 sTIPICAL CHARACTERISTICS Voltage Feedback Input Threshold vs. + Temperature (V =12V) Input Bias Current IB (A) Error AMP Block Input Bias Current vs. + Temperaure (V =12V,VFB=VFB(th)+0.15V) 5.1 Voltage Feedback Input Threshold VFB (V) 5.05 5 4.95 4.9 0.4 0.3 0.2 0.1 0 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) Oscillator Frequency vs. Temperature + (V =12V) -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) Current Limit Threshold vs. Temperature + (V =7.5V) 80 Oscillator Frequency f OSC (kHz) 75 70 65 60 9 Current Limit Threshold Ipk(SWITCH) (A) 8 7 6 5 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) Under Voltage Lockout Threshold vs. Temperature 60 Power Supply Current ICC (mA) 7 Startup Threshold V+ Increasing Ambient Temperature Ta (C) Operating-State Power Supply Current vs. Temperature + (V =40V,VFB=0V,Dudy Cycle=MAX) Under Voltage Lockout Threshold VTH(UVLO) (V) 8 50 40 30 20 10 0 6 5 Startup Threshold V+ Decreasing 4 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C) -5- NJM2367 sTYPICAL APPLICATIONS Step-Down Converter *SBD Vin L 4 Vout NJM2367 3 5 CF 1 2 R2 SBD Cout Cin RF R1 1) 5V and higher converter, the application must be connected R1 resistor according to above figure. 2) High current converter, the application must be placed Cin capacitor next to NJM2367, which avoid the power-line fluctuation. 3) The sharp fluctuation of output load cause reverse voltage for inductance and over the supply-voltage for SW OUT terminal. To avoid this problem, the application must be placed SBD between terminal 2 and 4. sTIMING CHART x Oscillator Compensation ON Switch output OFF ON Current sense OFF ON Thermal shutdown OFF y z { 1) The NJM2367 generate square waves. The PWM comparator generate PWM signals to compare square waves and compensation voltage. 2) The switching duty is maximum 95%. 3) Over the 6.5A current, the output switch will be OFF to operate current limit protection. The NJM2367 sense the switching current of power transistor. 4) Over the 180C (Tj), the switching will be OFF to operate thermal shutdown circuit. -6- NJM2367 MEMO [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. -7- |
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