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| NJM2378 PWM SWITCHING REGULATOR CONTROL IC FOR SLAVE TYPE GENERAL DESCRIPTION The NJM2378 is a high speed switching regulator control IC, and directly drive an external Bipolar Transistor to use internal totempole output circuit. The NJM2378 operate slave mode which synchronous external oscillation frequency, and the slave mode reduce the total noise. The NJM2378 is suitable for flyback type switching regulation up to 10W and several output power supply for LCD panel. PACKAGE OUTLINE NJM2378D NJM2378M NJM2378E FEATURES Operating Voltage (3.6 to 32V) Reference Voltage (2.5V2%) Input Outside Oscillator Frequency (5 to 350 kHz) Output Switch Current (8mA min.) Under Voltage Lockouts Circuit Bipolar Technology Package Outline DIP8, DMP8, EMP8, SSOP8 NJM2378V BLOCK DIAGRAM PIN FUNCTION 1.IN2.F.B 3.GND 4.OUT 5.V+ 6.CS 7.CT 8.REF Ver.2003-07-18 -1- NJM2378 ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER Supply Voltage Reference Output Current Output Current CT Pin Voltage Power Dissipation SYMBOL V + RATINGS 36 10 50 1.5 (DIP8) (DMP8) (EMP8) (SSOP8) 700 300 300 250 UNIT V mA mA V mW IOR IO VCT PD Operating Temperature Range Storage Temperature Range TOPR TSTG -40 to +85 -50 to +125 C C RECOMMENDED OPERATING CONDITIONS (V+=6V, Ta=25C) PARAMETER Operating Voltage Feed Back Resistor Oscillate SYMBOL V + MIN. 3.6 100 5 MAX. 32 350 UNIT V k kHz RNF fOSC INPUT WAVEFORME PARAMETER Triangle Waveform Offset Voltage SYMBOL VP-P VOFFSET RECOMMENDED 0.5 0.5 UNIT V V -2- Ver.2003-07-18 NJM2378 ELECTRICAL CHARACTERISTICS (V+=6V, RT=33k, CT=1000pF, Ta=25C OSC:Triangle Waveform, VP-P=0.5V, Offset=0.5V, fOSC=100kHz) REFERENCE VOLTAGE BLOCK PARAMETER Output Voltage Line Regulation Load Regulation SYMBOL VREF LINE LOAD + TEST CONDITION IOR=1mA V =3.6 to 32V, IOR=1mA IOR=0.1 to 5.0mA MIN. 2.45 - TYP. 2.50 6.8 5 MAX. 2.55 20.7 30 UNIT V mV mV OSCILLATOR BLOCK PARAMETER Reference Voltage Input Bias Current Open Loop Gain Gain Band width Product Maximum Output Voltage (F.B Pin) Output Source Current SYMBOL VB IB AV GB VOM+ VOMIOM+ RNF=100k RNF=100k VOM=1V TEST CONDITION MIN. 0.51 VREF-0.2 40 TYP. 0.52 5 90 0.6 85 MAX. 0.53 100 200 200 UNIT V nA dB MHz V mV A PWM COMPARATOR BLOCK PARAMETER Triangle Waveform Input Minimum Voltage (CT Pin) Triangle Waveform Input Maximum Voltage (CT Pin) Input Threshold Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) Maximum Duty Cycle SYMBOL OSCLO OSCHI VTH0 VTH50 M TEST CONDITION CT Pin Triangle Waveform Input CT Pin Triangle Waveform Input dutycycle=0% dutycycle=50% F.B Pin=1.2V MIN. 0 0.7 55 TYP. 0.55 0.87 64 MAX. 0.4 1.3 0.65 85 UNIT V V V V % SOFT START CIRCUIT BLOCK PARAMETER Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) SYMBOL IBCS VTHCS0 VTHCS50 dutycycle=0% dutycycle=50% TEST CONDITION MIN. TYP. 250 0.25 0.52 MAX. 650 0.35 UNIT nA V V Ver.2003-07-18 -3- NJM2378 ELECTRICAL CHARACTERISTICS (V+=6V, RT=33k, CT=1000pF, Ta=25C OSC:Triangle Waveform, VP-P=0.5V, OFFSET=0.5V, fOSC=100kHz) SHORT CIRCUIT PROTECTION PARAMETER Input Threshold Voltage (F.B Pin) Charge Current (CS Pin) Latch mode Threshold Voltage (CS Pin) SYMBOL VTHPC ICHG VTHLA CS Pin=0V,F.B Pin=2V TEST CONDITION MIN. 1.20 10 1.20 TYP. 1.50 30 1.50 MAX. 1.80 50 1.80 UNIT V A V UNDER VOLTAGE LOCKOUT PARAMETER ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage SYMBOL VTHON VTHOFF VHYS TEST CONDITION MIN. 60 TYP. 2.70 2.52 180 MAX. UNIT V V mV OUTPUT PARAMETER H-Output Voltage (OUT Pin) L-Output Voltage (OUT Pin) Output Source Current (OUT Pin) SYMBOL VOH VOL ISOURCE TEST CONDITION RL=10k Output Sink Current=20mA OUT Pin=0V MIN. 3.50 8 TYP. 4.00 0.25 11 MAX. 0.65 UNIT V V mA GENERAL CHARACTERISTICS PARAMETER Quiescent Current Average Quiescent Current SYMBOL ICCLA ICCAV TEST CONDITION Latch Mode RL=, dutycycle=50% MIN. TYP. 1.6 3.5 MAX. 2.2 4.8 UNIT mA mA -4- Ver.2003-07-18 NJM2378 TYPICAL APPLICATIONS Synchronous mode with NJM2368 External pulse mode Ver.2003-07-18 -5- NJM2378 TYPICAL CHARACTERISTICS H Output Voltage(OUT Pin) vs. Source Current (V+ =6V,OUT Pin=0V,OSC:Triangle Waveform VP-P =0.5V,Offset=0.5V,fosc=100kHz,Ta=25 8 H Output VoltageVOH Output VoltageV L Output Voltage(OUT Pin) vs. Sink Current (V+ =6V,OSC:Triangle Waveform VP-P =0.5V,Offset=0.5V,fosc=100kHz,Ta=25 1 0.8 0.6 0.4 0.2 0 7 6 5 4 3 2 1 0 0 2 4 6 8 10 Source Current (mA 12 0 10 20 30 40 50 Sink Current (mA) 60 Reference Voltage vs. Operating Voltage 2.52 Reference Voltage Operating Current vs. Operating Voltage 5 Operating Current ICC (mA) 4 3 2 1 0 ICCLA (Ta=25) (Ta=25) 2.51 ICCAV 2.5 2.49 2.48 0 10 20 + 30 40 0 10 20 + 30 40 Operating Voltage Operating Voltage V (V) -6- Ver.2003-07-18 NJM2378 TYPICAL CHARACTERISTICS Reference Voltage vs. Temperature 2.6 (V+ =6V,IOR =1mA) Output Source Current (OUT Pin) vs. Temperature 12 Output Source Current ISOURCE mA (V+ =6V,OSC:Triangle Waveform VP-P=0.5V,Offset=0.5V,fosc=100kHz) Reference Voltage 2.55 11 2.5 10 2.45 9 2.4 -50 -25 0 25 50 75 100 125 8 -50 -25 0 25 50 75 100 125 Ambient Temperature Ambient Temperature H Output Voltage (OUT Pin) vs. Temperature 6 (V+ =6V,RL=10k,OSC:Triangle Waveform VP-P=0.5V,Offset=0.5V,fosc=100kHz) L Output Voltage (OUT Pin) vs. Temperature 0.3 (V =6V,ISINK=20mA,OSC:Triangle Waveform VP-P =0.5V,Offset=0.5V,fosc=100kHz) + H Output Voltage L Output Voltage -50 -25 0 25 50 75 100 125 5 4 3 2 1 0 Ambient Temperature 0.25 0.2 0.15 0.1 0.05 0 -50 -25 0 25 50 75 100 125 Ambient Temperature Quiescent Current(Latch Mode) vs. Temperature 2 Quiescent Current (Latch Mode) Average Quiescent Current vs. Temperature (V =6V,RL=,OSC:Triangle Waveform VP-P=0.5V,Offset=0.5V,fosc=100kHz) 5 + (V =6V,OSC:Triangle Waveform VP-P =0.5V,Offset=0.5V,fosc=100kHz) Average Quiescent Current + 1.5 4 3 2 1 0 1 0.5 0 -50 -25 0 25 50 75 100 125 Ambient Temperature -50 -25 0 25 50 75 100 125 Ambient Temperature Ver.2003-07-18 -7- NJM2378 [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. -8- Ver.2003-07-18 |
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