S3882P

Semiconductor S3882P Current Mode PWM Controller Descriptions The S3882 is fixed PWM controller for Off-line and DC-DC converter applications. The internal circuits include UVLO, low start up current circuit, temperature compensated reference, high gain error amplifier, current sensing comparator, and high current totempole output for driving a power MOSFET. Also S3882 provide low start up current below 0.3mA and short shutdown delay Time typical 100nsec. S3882 have UVLO threshold of 16V(on) and 10V(off). . Features • Low start up current < 0.3mA • Operating range up to 500KHz • Cycle by cycle current limiting • Under Voltage Lock Out with hysteresis • Short shutdown delay time ; typical 100nsec • High current totempole output • Output swing limiting : 22V Ordering Information Type NO. S3882P Marking S3882P Package Code DIP-8 Outline Dimensions unit : mm PIN Connections 1. Output / Compensation 2. Voltage feedback. Input 3. Current sense Input 4. Rt/Ct 5. GND 6. Output 7. Vcc 8. Vref KSI-L008-000 1 S3882P Absolute Maximum Ratings Characteristic Supply Voltage Output Current Analog Inputs Error Amp. Output Sink current Power Dissipation Ta=25°C Symbol Vcc Io Vi(ana) Isink(EA) Pd Ratings 28 1 -0.3 to 6.3 10 1 Unit V A V mA W Electrical Characteristics (Vcc=15V, Rt=10Kohm,Ct=3.3nF, Ta=0℃ to 70℃, Unless otherwise specified) Characteristic 1. Reference Section Output Voltage Line Regulation Load Regulation Output Short Current Symbol Vref Δ Vref Δ Vref Isc fOSC △f /△V VOSC Idischarge Test Condition Tj=25℃, Io=1mA 12V ≤ VCC ≤ 25V 1mA ≤ IO ≤ 20mA Min. 4.91 -180 47 1.4 7.8 Typ. Max. 5.00 6 6 -100 52 0.2 1.7 8.3 5.09 20 25 57 1.0 1.8 8.8 Unit V mV mV mA KHz % V mA Ta=25°C Tj=25℃ 12V ≤ VCC ≤ 25V Vpin4, peak to peak Tj=25°C, Pin4=2V 2. Oscillator Section Initial Accuracy Voltage Stability Oscillator Voltage Discharge Current 3. Error Amp Section Input Voltage Input Bias Current Open Loop Voltage Gain Unity Gain Bandwidth PSRR Output Sink Current Output Source Current Output High Voltage Output Low Voltage V2 Ib AVO1 GBW PSRR1 ISINK ISOURCE VOH VOL VPIN1=2.5V 2V ≤ VO ≤ 4V Tj=25°C VCC=12V to 25V VPIN2=2.7V, VPIN1=1.1V VPIN2=2.3V, VPIN1=5V Vpin2=2.3V, R1=15 ㏀ to GN VPIN2=2.3V, R1=15 ㏀ to PIN8 5 2.42 -2.0 65 0.7 60 2 2.50 -0.3 90 1 70 6 -0.8 6 0.8 2.58 -0.5 1.1 V ㎂ ㏈ MHz ㏈ mA mA V V 4. Current Sense Section Gain Maximum Input Signal PSRR Input Bias Current Delay to Output GV Vi(MaX) PSRR2 I bias VPIN 1=5V 12V ≤ VCC ≤ 25V VPIN 3=0V to 2V 2.85 0.9 -10 - 3.0 1.0 70 -2 100 3.15 1.1 200 V/V V ㏈ ㎂ nS Td KSI-L008-000 2 S3882P Electrical Characteristics(continued) (Vcc=15V, Rt=10Kohm, Ct=3.3nF, Ta=0℃to 70℃, Unless otherwise specified) Characteristic 5. Output Section Output Low Level1 Output Low Level2 Output High Level1 Output High Level2 Rise Time Fall Time Out Volt. Swing Limit Symbol VOL1 VOL2 VOH1 VOH2 tr tf Volim Vth VtL Dmax Dmin Ist ICC VZ Test Condition Isink=20mA Isink=200mA Isource=20mA Isource=200mA Tj=25°C, C1=1nF Tj=25°C, C1=1nF Vcc=27V, C1=1nF After turn on Min. 13.0 12.0 - Typ. Max. 0.1 1.5 13.5 13.5 40 40 22 0.4 2.0 100 100 - Unit V V V V nS nS V 6. Under Voltage Lockout Section Start Threshold Min. Operating Voltage 15 9 16 10 17 11 V V 7.PWM Section Maximum Duty Cycle Minimum Duty Cycle 94 96 100 0 % % 8.Total Standby Section Start-Up Current Operating Supply Current VCC Zener Voltage 0.2 11 29 0.4 17 mA mA V Vpin2=Vpin3=0V ICC=25mA NOTE: Adjust Vcc above the the start threshold before setting at 15V Block Diagram 7 29V 5V V ref Set/ Re s e t Vcc Vref 8 5 UV LO GND In t e r n al Bi as LO G IC PWR Vc 1/2 V r e f Er r or Amp C.S Comp 1/3 1V PWM LATCH 7 Vfb 2 + - R 22V 6 Output Com 1 C.S 3 S PWR GND 5 Rt/Ct 4 Os c i l l at or KSI-L008-000 3 S3882P Information in Using IC 1. Under voltage Lockout To prevent erratic output behavior which activating V cc 7 O N /O F F C O M M A N D T O R ES ET O F IC the power switch with extraneous leakage currents, during under voltage lockout. Output(pin6) should be shunted to ground with a bleeder resister. V o n -16V V o f f -10V Icc The Vcc comparator upper and lower threshold are 16V/10V. The large hysteresis and low start up currents makes it ideally suited in off-line converter