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| NJM2355 TWO OUTPUT HIGH VOLTAGE SWITCHING REGULATOR GENERAL DESCRIPTION New JRC's high voltage switching regulator, NJM2355, is a monolithic high voltage (50V max) operation integrated circuit consisting of two channel PWM controllers. The NJM2355 contains an internal 5V reference, free running oscillator, low supply voltage detector, two comparators and three error amplifiers. The error amp 2 or amp 3 is for current limiting in channel B output circuit. The NJM2355 is suited for DC to DC converter application; step up, step down, positive to negative. FEATURES * Operating Voltage (7.5V to 50V) * Complete PWM Power Control Circuit * Uncommitted Outputs fov 200-mA Sink or Source * Output control Selects Single-Ended or pull Operation * Internal Cicuitry Prohibits Double Pulse at Either Output * Variable Dead-Time Provides Control Over Total Range * Package Outline DIP18 * Bipolar Technology BLOCK DIAGRAM & PIN CONFIGURATION PACKAGE OUTLINE NJM2355D NJM2355D Ver.2003-07-18 -1- NJM2355 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Output Current 1 Output Current 2 Power Dissipation Operating Temperature Range Storage Temperature Range SYMBOL V + (Ta = 25C) RATINGS 24 200 200 700 -20 to + 75 -40 to +125 UNIT V mA mA mW C C I01 I02 PD Topr Tstg ELECTRICAL CHARACTERISTICS PARAMETER Operating Current (1) Operating Current (2) SYMBOL ICC (1) ICC (2) V = 15V V = 50V + + (Ta = 25C, V+ = 15V) TEST CONDITION MIN. TYP. 5.7 5.9 MAX. 7.5 8.0 UNIT mA mA < Reference Section > PARAMETER Output Voltage Line Ragulation Load Regulation Output Short Current Output disable Voltage Output disable hysterisis Voltage Vnop Vnop OUT= High Level SYMBOL VREF REGin REG1 IREF = 0mA V = 7.5V to 50V, IREF = 0mA IREF = 0mA to 10mA + TEST CONDITION MIN. 4.8 - TYP. 5.0 12 6 30 4.3 0.3 MAX. 5.2 35 15 4.6 - UNIT V mV mV mA V V < Oscillator Section> PARAMETER Frequency SYMBOL FO TEST CONDITION Ct = 0.01F, Rt = 4.3k MIN. 25 TYP. 28 MAX. 31 UNIT kHz < Dead Interval Adjustment Section > PARAMETER Input Bias Current Maximum Duty (On-time) Input Threshold Voltage SYMBOL Ibdt Ton/T Vth DT = 0V Ct = 0.01F, Rt = 4.3k Duty Cycle : 0% TEST CONDITION MIN. 90 2.0 TYP. 2.5 MAX. -10 3.0 UNIT A % V < PWM Comparator Section > PARAMETER Input Threshold Voltage SYMBOL Vthe TEST CONDITION Duty Cycle : 0% MIN. TYP. MAX. 4.5 UNIT V -2- Ver.2003-07-18 NJM2355 ELECTRICAL CHARACTERISTICS PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Range Voltage Gain Band Width Common Mode Rejection Ratio Output Sink Current Output Source Current SYMBOL VIO IIO IB VICM AV ft CMR ISINK ISOURSE FB = 2.5V FB = 2.5V FB = 2.5V V = 7.5 to 50V FB = 0.5 to 3.5V AV = 1 VCC = 50V VID = 5V, FB = 0.7V VID = 5V, FB = 3.5V + (V+ = 15V, Ta = 25C) TEST CONDITION MIN. 0 70 65 0.2 -1 TYP. 1 5 0.05 100 800 80 0.4 -2.5 MAX. 10 250 1 VCC-2 UNIT mV nA A V dB kHz dB mA mA < Output Section > PARAMETER Leak Current Saturation Voltage SYMBOL ICER VSAT VCE = 50V IO = 100mA TEST CONDITION MIN. TYP. 0.9 MAX. 100 1.3 UNIT A V Ver.2003-07-18 -3- NJM2355 TERMINAL EXPLANATION PIN NO. 1. PIN SYMBOL VREF FUCTION 5V Reference Voltage Output EQUIVALENT CIRCUIT 2. Ct The oscillator frequency is decided by putting Capacitor, Ct. 3. Rt The oscillator frequency is decided by putting resistor, Rt. -4- Ver.2003-07-18 NJM2355 TERMINAL EXPLANATION PIN NO. 4. 5. 16. 15. 18. 17. PIN SYMBOL +INPUT1 -INPUT1 +INPUT3 -INPUT3 +INPUT2 -INPUT2 FUNCTION +INPUT of Error Amp 1 (A Channel) -INPUT of Error Amp 1 (A Channel) +INPUT of Error Amp 3 (B Channel) -INPUT of Error Amp 3 (B Channel) +INPUT of Error Amp 2 (B Channel) -INPUT of Error Amp 2 (B Channel) EQUIVALENT CIRCUIT 6. FEED BACK-A OUTPUT of Error Amp 1 (A Channel) 14. FEED BACK-B OUTPUT of Error Amp 2 and Error Amp 3 (B Channel) Ver.2003-07-18 -5- NJM2355 TERMINAL EXPLANATION PIN NO. 7. 13. PIN SYMBOL DEAD TIME CONTROL-A DEAD TIME CONTROL-B FUNCTION The Dead Time Width is adjustable by terminal voltage adjust. (A Channel) (B-Channel) EQUIVALENT CIRCUIT 8. 9. 11. SYSTEM GND OUT-A OUT-B Ground Internal Switching Transistor: Open Collector (A Channel) (B-Channel) 10. 12. POWER GND V+ Ground Connect to PIN 8. Power Supply -6- Ver.2003-07-18 NJM2355 TYPICAL APPLICATION Ver.2003-07-18 -7- NJM2355 TYPICAL CHARACTERISTICS Output Disable Voltage at Low Input Voltage Output Disable Voltage at Low Input Voltage vs. Temperature Operating Current vs. Operating Voltage Reference Voltage vs. Operating Voltage Reference Voltage vs. Temperature Oscillation Frequency vs. Rt, Ct -8- Ver.2003-07-18 NJM2355 TYPICAL CHARACTERISTICS Oscillation Frequency vs. Temperature Open Loop Voltage Gain vs. Frequency < Error Amplifier Section > Output Sink Current vs. Feedback Terminal Voltage < Error Amplifier Section > Output Source Current vs. Feedback Terminal Voltage < Error Amplifier Section> Output Sink Current vs. Temparature < Error Amplifier Section > Output Source Current vs. Temperature Ver.2003-07-18 -9- NJM2355 TYPICAL CHARACTERISTICS < Output Section > Saturation Voltage vs. Output Current < Output Section > Saturation Voltage vs. Temperature [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. - 10 - Ver.2003-07-18 |
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