NJM3524 SWITCHING REGULATOR CONTROL CIRCUIT = GENERAL DESCRIPTION The NJM3524 of regulating pulse width modulators contains all of the control circuitry necessary to implement switching regulators of either polarity, transformer coupled DC to DC converters, transformer- less polarity converters and voltage doublers, as well as other power control applications. This device includes a SV voltage regulator capa- ble of supplying up to 50mA to external circuitry a control amplifier, an oscillator, a pulse width modulator, a phase splitting flip-flop, dual alternating output switch transistors, and current limiting and shut- down circuitry. Both the regulator output transistor and each output switch are internally current limited and, to limit junction temperature, an internal thermal shut-down circuit is employed. = FEATURES @ Operating Voltage (8V~40V) @ Complete PWM Power Control Circuitry @ Uncommitted Outputs for Single-Ended or Pash-Pull Appli Cutions @ Low Stardby Current @ Package Outline DIP16, DMP16, SSOP16 e Bipolar Technology = RECOMMEND OPERATING CONDITION Parameter Symbol | Min. | Typ. | Max. Unit Operating Voltage vr 8 20 40 Vv Output Reference Current TRrEF 0 _ 50 mA Timing Resistance Ry 18 100 kQ Timing Capacitor Cr _ 0.1 | uF Operating Temperature Range Tope 20 25 75 | C ry @ EQUIVALENT CIRCUIT 6-128 New epan Radio Co,Ltd. = PACKAGE OUTLINE WSM35240 NJM3524M <p WJM3524V = PIN CONFIGURATION INV INPUT [1] 76] VREF(5V) NON INVERTING INPUT [2] [is] v* Osc out L3 [ia] 2 c.L.+) [4] [13] c2 C.LA-) [By 12] cl Rr [6| 11] El SHUT cr 10) DOWN GND [8 | | 9] Comp J NJM3524 eee eee e reer errr ee re = ABSOLUTE MAXIMUM RATINGS (Ta=25T) PARAMETER SYMBOL RATINGS UNIT Supply Voltage vr 40 v Output Current To 100 mA Output Reference Current TREF 50 mA Power Dissipation Pp wipe) 78 mw (DMP16) 300 mW Operating Temperature Range Topr 20~+75 Storage Temperature Range Tsig 40~+125 @ ELECTRICAL CHARACTERISTICS Electrical characteristics over recommended operating free-air temperature range, V*=20V, f=20kHz (unless otherwise fioted). Reference Section PARAMETER SYMBOL TEST CONDITION MIN. | TYP. |MAX. | UNIT Output Voltage Vrer vt=20V 4.6 5.0 5.4|]V Line Regulation AVrer-V* *=8~40V ~ 10 30 mV Load Regulation AVrer-Iree] V*=10V. Ipep=0~20mA _ 20 50 | mV Ripple Rejection RR Vt =20V, f=120Hz 66 ~ dB Temperature Coefficient T.C. Ta=20~+78C _ -1 | mVPC Short Circuit Output Current TreFs | 100 |mA Error Amplifier Section Input Offset Voltage Vio Vic=2.5V _ 2 10 mV Input Bias Current In(1) Vic=2.5V _ 2 10 BA Open Loop Voltage Gain Ay 60 80 _ dB Input Common Mode Voltage Range Vem Ta=25C 18 _ 3.4 |v Common Mode Rejection Ratio CMR 70 _ dB Unity Gain Bandwidth _ _ 3 _ MHz Output Voltage Swing _ 05) 3.8] Vv Oscillator Section Frequency fose Cr =0.01pF, Rr =2k0 | 30 | kHz Frequency Change with Voltage _ V*t=8~40V _ 1 % Frequency Change with Temperature _ Ta=20~+75C _ _ 3 % Output Pulse Width(Pin 3) _ Cr=0.01uF _ 05) us Output Amplitude(Pin 3) _ _ 35] |v New Japan Radio Co.Ltd. 6-129 NJM3524 Comparator Section Maximum Duty Cycle 0 _ 45 % Input Threshold (Pin 9) Vin 0 duty cycle 1.0 ~ v Input Threshold (Pin 9) Vin Max duty cycle _ 3.5 _ Vv Input Bias Current I3(2) _ 1 _ BA Current Limiting Section Input Voltage Range _ -07) | +10 ;Vv Sense Voltage _ VayVay250mVv 180 200 220 mv Sense Voltage Temperature Coefficient _ _ 0.2 _ mVPC Output Section Collector-Emitter Breakdown Voltage VceR 40 _ _ Vv Collector Leakage Current IcER VoR=40V 0.1 | 50 BA Collector-Emitter Saturation Voltage VcesaTy Ip9=S0mA _ 1 2 Vv Emitter Output Voltage _ V*=20V, Ip= 250nA 17 18 |v Turn-off Voltage Rise Time T, Rco=2kN _ 0.2 | ps Turn-on Voltage Fall Time T; Re =2kQ _ 0.1 _ as Total Device Standby Current Ig V*=40V, Pingy=2V _ 8 10 mA 1,4,7,8,9,11,14=GND All Other Inputs and Outputs Open = BLOCK DIAGRAM OT a | Reference ' Regulator 16 | 12 Oscillator Flip-Flop nN Comparator NOR Current Limit Error Amp. + 6-130 New Japan Radio Co.Ltd. J NJM3524 = ERROR AMPLIFIER BIAS CIRCUITS (A) Positive Output (B) Negative Output VREeF VREF (4 Vo 5k $ Rz 5k Ri _ _ VReF Re Vo= VEE. (Rey) 2 Re 1) 2 5k Rz Vo @ CURRENT LIMIT (a) Take the detection output from the ground line side, because the input voltage range is U.7V ~+1.0V. (b) The sensing voltage is 200mV typical. Ei - TS a Rs 1 Ep Town =p- (Vsense + RoR) x 3 = Vo -C.L. R:S R I __ VseNnse +C.L. Zim 05 Rs VV = SOFT START METHOD It is possible that the output stage is broken due to a wrong operation of circuits simultaneously when supply voltage was applied. This failure can be prevented by setting the error amplifier output to a low level for a certain time as shown in the right figure. In this case, the soft start time is determined by the time constant of Rg and Cp. VRer Rs al comp 1. == Ca a @ OUTPUT CONFIGURATIONS CO va | CUM <n Po Eee | p tM pot AM | | SSAA k Lio a: Lvov 23 em vO T | z T ! I \ \ ; E a Ve +Vo I | | | , 1 , 4M +Va | vy +p | fa, | Sa 5 KY, | { Sa/Sp Vie Ve | l ai VIS Va | ! T | ! ! lav =Vo | 4 4M Yo | | | SE | 8p Te i | | Se a) T Vip vol ! SaiSp T Val<|Volt | Push Pull Flyback L_------ oe PL 4 Capacitor-Diode-Coupled Single-Ended Inductor Circuit Transformer-Coupled Outputs Voltage Multiplier Output stage = TYPICAL APPLICATIONS Vt =46V V+ =20V Vt =15V +15V 100 sk 1k INV E, 20mA 54 Vee ; : NONINY Cy 15V E. sv on E OT NONINV Ci SV, & eee E ol REF OUT 5A OT , -5V Ry Ea a R Ea 20mA TCL C r W024 CL r 1 ~CL. CL. GND Fig. 1 Capacitor-Diode Output Circuit Fig. 2 Flyback Converter Circuit Fig. 3 Push-Pull Transformer-Coupled Circuit New Japan Radio Co,Ltd. 6-131 NJM3524 = POWER DISSIPATION VS. AMBIENT TEMPERATURE S & % -:1000 a a a DIP oS z son MN a s Pp DMP mW) [| 25 50 75 100 Temperature Ta (C) w TYPICAL CHARACTERISTICS Reference Voltage vs. Operating Voltage Standby Current vs. Operating Voltage s 5 gy zB 5 zg S Q VreF (Vv) (ma) 0 10 20 30 0 10 20 30 40 Operating Voltage V* (V) Operating Voltage V* (V) Open Loop Voltage Gain vs. Frequency R;,C, vs. Frequency & vo s 100k s N\ s 30k N RN a Rr IN a c a Q (Q) x Dp 6 10k aN oN mo \ Av (dB) 100 300 Ik 3k 10k 30k 3k NS x Frequency f (Hz). 300 1k 3k 10k 30k 100k Frequency f (Hz) 6-132_-Nnew Japan Radio Co, Lk