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S3843

AUK corp
Part Number S3843
Manufacturer AUK corp
Description Current Mode PWM Controller
Published Apr 7, 2005
Detailed Description Semiconductor S3843 Current Mode PWM Controller Descriptions The S3843 is fixed Current PWM controller for Off-line an...
Datasheet PDF File S3843 PDF File

S3843
S3843

Overview
Semiconductor S3843 Current Mode PWM Controller Descriptions The S3843 is fixed Current PWM controller for Off-line and DC-DC converter applications.
The internal circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier current sensing comparator, and a high current totempole output for driving a power MOSFET.
Protection circuitly includes built in under voltage lockout and current limiting.
S3843 have UVLO threshold of 8.
4V(on) and 7.
6V(off) , S3843 can operate within 100% duty cycle.
Features • Optimized for off-line and DC to DC converters • Low start up current < 1 mA • Operating range up to 500 KHz • Pulse-by-pulse current limiting • Under Voltage Lock Out with hysteresis • High current totempole output • Short shutdown delay time ; typical 100nsec Ordering Information Type NO.
S3843 Marking S3843 Package Code SOP-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-8007-001 1 S3843 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 30 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.
90 -30 47 7.
8 Typ.
Max.
5.
00 6 6 -100 52 0.
2 1.
7 8.
3 5.
10 20 25 -180 57 1.
0 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 Loo...


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