Designated client product This product will be discontinued its production in the near term. And it is provided for customers currently in use only, with a time limit. It can not be available for your new project. Please select other new or existing products. For more information, please contact our sales office in your region. New Japan Radio Co.,Ltd. http://www.njr.com/

NJM3524 SWITCHING REGULATOR CONTROL CIRCUIT ■ GENERAL DESCRIPTION ■ PACKAGE OUTLINE The NJM3524 of regulating pulse width modulators contains all of the control circuitry necessary to implement switching regulators of either polarity converters and voltage doublers, as well as other power control applications. This device includes a 5V voltage regulator capable 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 NJM3524D NJM3524M 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. NJM3524V ■ FEATURES • Operating Voltage (8V to 40V) • Complete PWM Power Control Circuitry • Uncommitted Outputs for Single-Ended or Pash-Pull Appli Cutions • Low Stand by Current • Package Outline DIP16, DMP16, SSOP16 • Bipolar Technology ■ RECOMMEND OPERATING CONDITION ■ PIN CONFIGURATION Parameter Symbol Min. Typ. Max. Unit Operating Voltage V+ 8 20 40 V Output Reference Current I 0 - 50 mA REF Timing Resistance R 1.8 - 100 kΩ T Timing Capacitor C - 0.1 (cid:181)F T Operating Temperature Range T -20 25 75 (cid:176)C opr ■ EQUIVALENT CIRCUIT Ver.2003-07-18 -1-

NJM3524 ■ ABSOLUTE MAXIMUM RATINGS (T = 25”C) a PARAMETER SYMBOL RATINGS UNIT Supply Voltage V+ 40 V Output Current I 100 mA O Output Reference Current I 50 mA REF (DIP16) 700 mW Power Dissipation P D (DMP16) 300 mW Operating Temperature Range T -20 to + 75 ”C opr Storage Temperature Range T -40 to +125 ”C stg ■ ELECTRICAL CHARACTERISTICS Electrical characteristics over recommended operating free-air temperature range, V+ = 20V, f = 20kHz (unless otherwise noted). Reference Section PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage V V+ = 20v 4.6 5.0 5.4 V REF Line Regulation ∆V -V+ V+ = 8 to 40V - 10 30 mV REF Load Regulation ∆V -I V+ = 10V, I = 0 to 20mA - 20 50 mV REF REF REF Ripple Rejection RR V+ = 20V, f = 120Hz - 66 - dB Temperature Coefficient T. C. Ta = -20 to +75(cid:176)C - -1 - mV/(cid:176)C Short Circuit Output Current I - 100 - mA REF S Error Amplifier Section Input Offset Voltage V V = 2.5V - 2 10 mV IO IC Input Bias Current I (1) V = 2.5V - 2 10 (cid:181)A B IC Open Loop Voltage Gain A 60 80 - dB V Input Common Mode Voltage Range V T = 25(cid:176)C 1.8 - 3.4 V CM a Common Mode Rejection Ratio CMR - 70 - dB Unity Gain Bandwidth - - 3 - MHz Output Voltage Swing - 0.5 - 3.8 V Oscillator Section Frequency f C = 0.01(cid:181)F, R = 2kΩ - 30 - kHz OSC T T Frequency Change with Voltage - V+ = 8 to 40V - - 1 % Frequency Change with Temperature - T = -20 to +75(cid:176)C - - 3 % a Output Pulse Width (Pin 3) - C = 0.01(cid:181)F - 0.5 - (cid:181)S T Output Amplitude (Pin 3) - - 3.5 - V - 2 - Ver.2003-07-18

NJM3524 Comparator Section Maximum Duty Cycle - 0 - 45 % Input Threshold (Pin 9) V "0" duty cycle - 1.0 - V IH Input Threshold (Pin 9) V "Max" duty cycle - 3.5 - V IH Input Bias Current I (2) - 1 - (cid:181)A B Current Limiting Section Input Voltage Range - -0.7 - +1.0 V Sense Voltage - V - V ≥ 50mV 180 200 220 mV (2) (1) Sense Voltage Temperature Coefficient - - 0.2 - mV/(cid:176)C Output Section Collector-Emitter Breakdown Voltage V 40 - - V CER Collector Leakage Current I V = 40V - 0.1 50 (cid:181)A CER CE Collector-Emitter Saturation Voltage V I = 50mA - 1 2 V CE(SAT) O Emitter Output Voltage - V+ = 20V, I = -250(cid:181)A 17 18 - V F Turn-off Voltage Rise Time T R = 2kΩ - 0.2 - (cid:181)S r C Turn-on Voltage Fall Time T R = 2kΩ - 0.1 - (cid:181)S I C Total Device Standby Current I V+ = 40V, Pin = 2V - 8 10 mA Q (2) 1, 4, 7, 8, 9, 11, 14 = GND All Other Inputs and Outputs Open ■ BLOCK DIAGRAM Ver.2003-07-18 -3-

NJM3524 ■ ERROR AMPLIFIER BIAS CIRCUITS (A) Positive Output (B) Negative Output VO = VREF⋅R2+1 VO = -VREF⋅R2-1 2 R1  2 R1  ■ CURRENT LIMIT (a) Take the detection output from the ground line side, because the input voltage range is -0.7V to +1.0V. (b) The sensing voltage is 200mV typical. 1 R2 IO(MAX) = (VSENSE+ VO) RS R1+R2 V I = SENSE OS R S ■ 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 R and C . B B ■ OUTPUT CONFIGURATIONS Capacitor-Diode-Coupled Single-Ended Inductor Circuit Transformer-Coupled Outputs Voltage Multiplier Output stage ■ TYPICAL APPLICATIONS Fig. 1 Capacitor-Diode Output Circuit Fig. 2 Flyback Converter Circuit Fig. 3 Push-Pull Transformer-Coupled Circuit - 4 - Ver.2003-07-18

NJM3524 ■ POWER DISSIPATION VS. AMBIENT TEMPERATURE ■ TYPICAL CHARACTERISTICS Reference Voltage vs. Operating Voltage Standby Current vs. Operating Voltage Open Loop Voltage Gain vs. Frequency R , C vs. Frequency T T [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. Ver.2003-07-18 -5-