tine} NJM2368 SWITCHING REGULATOR CONTROL IC FOR FLYBACK Mi GENERAL DESCRIPTION Mi PACKAGE OUTLINE The NJM2368 is a high speed switching regulator control IG which can operate at low voltage. It uses a totempole output circuit , so that it can drive an external Bipolar Transistor directly. It is suitable for applications of flyback type switching regulation of up to 10W. NJM2368D NJM2368M W FEATURES @ Operating Voltage (3.6~32V) @ Wide Oscillator Range (5~350 kHz) SA AL @ Soft-Start Function. N Se @ Under Voltage Lockouts (U.V.L.0.) @ Bipolar Technology NJN2368E NJM2368V @ Package Outline DIP8, DMP8, EMP8, SSOP8 @ BLOCK DIAGRAM REF re] UV.LO 7 z FUNCTION [No F. B GND OUT vt cs CT REF ONO AWD 6-174 New Japan Radio Co, Ltd.NJM2368 ME ABSOLUTE MAXIMUM RATINGS (T a=2 5C) PARAMETER SYMBOL MAXIMUM RATINGS UNIT Input Voltage ve 36 v Reference Output Current lor 10 mA Output Current lo +50 mA Power Dissipation Po (DIP8) 700 mW (DMP8) 300 (EMP8) 300 (SSoP8) 250 Operating Temperature Range | Topr -40~+85 Tc Storage Temperature Range Tst4 ~50~+125 ae Mi RECOMMENDED OPERATING CONDITIONS (V=6V, Ta=25) PARAMETER SYMBOL RATINGS MIN. |IMAX. [UNIT Operating Voltage vi 3.6 32 Vv Feed Back Resistor Rae 100 - kQ Oscillator Timing Capacitor Cr 220 22000 pF Oscillator Timing Resistor Rr 10 100 kQ Osci | late f osc 5 350 kHz M@ ELECTRICAL CHARACTERISTICS (V*=6V, Rr=33k2, Cr=1000pF, Ta=25T) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL RATINGS MEN. |TYP. IMAXx. | UNIT G6 Output Voltage Vrer lor=1ImA 2.45 2. 50 2.55 Vv Line Regulation Line |V*=3. 6~32V, lon=1mA - 6.8 20.7 mV Load Regulation Load lor=0. 1~5. OmA - 5 30 mV OSCILLATOR BLOCK PARAMETER SYMBOL RATINGS MIEN TYP. |MAX. UNIT Osci I tate fosc |Cr1=1000pF, R1=33k 2 85 105 125 kHz Oscillate Fluctuations fae |V=3.6~32V - 1 _ % (Line Fluctuations) Osci I late Fluctuations2 f as Ta=-40~+85C _ 5 - % (Temp Fluctuations) New Japan Radio Co,thd. 6-175NJM2368 eee ee eee eee eee ence ee M@ ELECTRICAL CHARACTERISTICS (V7=6V, Rr=33kQ, Cr=1000pF, Ta=25) ERROR AMPLIFIER BLOCK PARAMETER SYMBOL RATINGS MIN. |TYP. IMAX. UNIT Reference Voltage Ve 0. 51 0. 52 0. 53 v Input Bias Current i) - 5 100 naA Open Loop Gain Av _ 90 - dB Gain Band width Product Ge - 0.6 - MH z Maximum Output Voltage Vom+ |Rne=100kQ Vrer-O. 2 - - Vv (F. B Pin) V om- Rar =100k 92 _ _- 200 mV Output Source Current lom+ |Vom=1V 40 85 200 HA (F.B Pin) PWM COMPARATE BLOCK PARAMETER SYMBOL RATINGS MIN. |TYP. |IMAX. UNIT Input Bias Voltage Vino |duty-cycle=0% - 0. 55 0. 65 Vv (F.B Pin) Input Threshold Voltage Vinso |duty:cycle=50% _ 0. 87 - v (F.B Pin) Maximum Duty Cycle aM s/F.B Pin=1. 2V 55 64 85 % SOFT START CIRCUIT BLOCK PARAMETER SYMBOL RATINGS MEN. |TYP. |MAX. UNIT Input Bias Current lacs - 250 650 nA (CS Pin) Input Threshold Voltage Viteso |duty:-cycle=0% - 0. 25 0. 35 Vv (CS Pin) Input Threshold Voltage | V tucsso|duty:cycle=50% - 0. 52 - Vv (CS Pin) SHORT CIRCUIT PROTECTION PARAMETER SYMBOL RATINGS MIN. |TYP. |MAX. UNIT Input Threshold Voltage | V tHec 1.20 1.50 1. 80 v (F.B Pin) Charge Current (CS Pin)| I cua [CS Pin=OV,F.B Pin=2V 10 30 50 uA Latch mode Threshold Vita 1. 20 1. 50 1. 80 Vv Voltage (CS Pin) UNDER VOLTAGE LOCKOUT PARAMETER SYMBOL RATINGS MIN. |TYP. |IMAX. UN TT ON Threshold Voltage V tHon - 2.70 - Vv OFF Threshold Voltage V THOFF _ 2.52 - Vv Hysteresis Voltage Viuvs 60 180 - mV 6-176 New Japan Radio Co, Ld.NJM2368 M@ ELECTRICAL CHARACTERISTICS (V=6V, Rr=33kKQ9, Cr=1000pF, Ta=25) OUTPUT PARAMETER SYMBOL RATINGS MIN. | TYP. IMAX. UNIT H-Output Voltage (OUT Pin) Von |Ri=10k92 3.50 4.00 - Vv L-Output Voltage (OUT Pin) Vor {Output Sink Current=20mA - 0. 25 0. 65 Vv Output Source Current | source|OUT Pin=0V 8 11 ~ mA (OUT Pin) GENERAL CHARACTERISTIC PARAMETER SYMBOL RATINGS MIN TYP. |[MAX. UNIT Quiescent Current | cera [Latch _ 1.6 2.2 mA Average Quiescent Current) | ccav |Ri=09, duty cycle=50% - 3.5 4.8 mA Mi APPLICATION vt oO +5V Cin ZZ i 22k Q Hi > Cout 1 a 2kQ 2 | Qi 2200pF 2.2kQ INQ -O GND GND New Japan Radio Co, Lid 6-177 JNJM2368 M@ TYPICAL CHARACTERISTICS H Output Voltage vs. Source Current (V"=6V,R,=33k Q ,C=1000pF, T. H Output Voltage Vo, (V) bh oO RO a@ YN Oo _ Qo So 2 4 6 8 10 12 Source Current Isource (mA) Oscillator Frequency vs. Timing Resistor (V*=6V,Ta=25C) 1000 = Oo CT=470pF fosc (kHz) CT=1000pF = o Oscillator Frequency 1 10 100 1000 Timing Resistance R; (kQ) 10000 Reference Voltage vs. Operating Voltage (V"=6V,Ta=25C) 2.52 2.51 2.5 2.49 Reference Voltage Ver (V) 2.48 0 10 20 30 40 Operating Voltage V" (V) 6-178 New Japan Radio Co, Ltd. L Output Voltage vs. Sink Current (V*=6V,Ry=33k Q ,C,=1000pF,Ta=25C) . } 0.4 J A 0.8 L Output Voltage Vo, (V) 0 10 20 30 40 50 60 Sink Current Iginx (mA) Oscillator Frequency vs. Timing Capacitor (V*=6V,Ta=25C) 10000 So o 100 RT=10kQ Laniti RT=33kQ Oscilattor Frequency fosc (kHz) = o RT=100k92 10 1000 Timing Capacitor C, (pF) 100000 Operating Current vs. Operating Voltage (Ta=25C) oa ICCAV aw _ Ro Operating Voltage ICC (mA) = w oO o 10 20 30 40 Operating Voltage V" (V)NJM2368 M@ TYPICAL CHARACTERISTICS Oscillator Frequency vs. Temperature Reference Voltage vs. Temperature (V"=6V,R,=33k Q ,C;=1000pF) (V"=6V Iog=1mA) 160 3 = > 140 n 2.8 & ae oN > 3N 5 120 2.6 4 & ww ema e s . ema 5 0 r $s % @ 100 > 24 = 2 o 8 . 8 oO | o 80 | 3 2.2 o | a 60 2 -50 -25 O 25 50 75 100 125 -50 -25 0 25 50 75 100 125 Ambient Temperature Ta (C) Ambient Temperature Ta (C) H Output Voltage vs. Temperature L Output Voltage vs. Temperature (V*=6V,R,=10kQ ,R-=33k 2 .C;=1000pF) (V"=6V, Isiyx=20mA,R7=33k Q ,C7=1000pF) 10 05 T T i > -_ i ~ 8 Z OA x= a > 6 > 0.3 & 3 Z amt af Ss o4F S 02 _ % 5 . } 2 6 0.1 xr 4 | 0 0 | -50 -25 0 25 50.75 100 125 -50 -25 ; 0 25 50 75 100 125 Ambient Temperature Ta (C) Ambient Temperature Ta (C) 6 Average Quiescent Current vs. Quiescent Current vs. Temperature Temperature (Latch Mode, V"=6V,R7=33k Q ,C;=1000pF) (V=6V,R, =00,duty- cycle=50%, 2 5 R,=33k Q ,C;=1000pF) 1.8 . 4 2 L_ S 5 1.6 i g a sean Oo . = 2 3 bo ww > o 3 or g a14 2S X02 3~ s 2 1.2 < 1 1 0 -50 -25 0 25 50 75 100 125 -50 ~-25 O 25 50 75 100 125 Ambient Temperature Ta (C) Ambient Temperature Ta (C) New Japan Radio Co,Lbd 6-179