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S3842, S3842P, S3843

Table of contents:
Info of S3842
Info of S3842P
Info of S3843

S3842, S3842P, S3843 Selling Leads, Datasheet

MFG:SOP-8P Package Cooled:AUK D/C:03+

S3842, S3842P, S3843 Datasheet download

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Part Number: S3842

MFG: SOP-8P

Package Cooled: AUK

D/C: 03+

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S3842 General Description

The S3842, high performance current mode controller, Provides the necessary features to off-line and DC-DC fixed frequency current control applications offering the designer a cost effective solution with minimal external components. Internally protection circuity includes built-in input and reference under-voltage lockout and current limiting with hysteresis. Also other characteristics of internal circuit provide improved line regulation, enhanced load response, trimmed oscillation for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and totempole output designed to source and sink high peak current from a capacitive load such as the gate of a power MOSFET.

S3842 Maximum Ratings

Characteristic	Symbol	Ratings	Unit
Supply voltage	V_CC	30	V
Current Sense and Vfb Input	V_IN	-0.3 to V_cc	V
Total Power Supply and Zener Current	I_CC+ I_Z	30	mA
Output Sink of Source Current	I_o	1	A
Error AMP Output Sink Current	I_eo	10	mA
Operating Ambient Temperature	T_a	0 to 70
Storage Temperature Range	T_stg	-65 to 150
Power Dissipation at T_a 50	P_d	1	W

note) All voltages are with respect to PIN5, and current are positive into the specified pin.

S3842 Features

• Optimized for off-line control
• Low start up and operating current
• Pulse by pulse current limiting
• Enhanced load response characteristic
• Current mode operation to 500 ㎑
• Under voltage lockout with 6V hysteresis
• Internally trimmed bandgap reference about 5V
• Automatic feed forward compensation

S3842 Connection Diagram

S3842P General Description

The S3842, high performance current mode controller, Provides the necessary features to off-line and DC-DC fixed frequency current control applications offering the designer a cost effective solution with minimal external components. Internally protection circuity includes built-in input and reference under-voltage lockout and current limiting with hysteresis.

Also other characteristics of internal circuit provide improved line regulation, enhanced load response, trimmed oscillation for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator and totempole output designed to source and sink high peak current from a capacitive load such as the gate of a power MOSFET.

S3842P Maximum Ratings

Characteristic	Symbol	Ratings	Unit
Supply voltage	V_CC	30	V
Current Sense and Vfb Input	V_IN	-0.3 to V_cc	V
Total Power Supply and Zener Current	I_CC+ I_Z	30	mA
Output Sink of Source Current	I_o	1	A
Error AMP Output Sink Current	I_eo	10	mA
Operating Ambient Temperature	T_a	0 to 70
Storage Temperature Range	T_stg	-65 to 150
Power Dissipation at T_a 50	P_d	1	W

note) All voltages are with respect to PIN5, and current are positive into the specified pin.

S3842P Features

S3843 General Description

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.

S3843 Maximum Ratings

Characteristic	Symbol	Ratings	Unit
Supply voltage	V_CC	30	V
Output Current	I_o	1	A
Analog Inputs	V_i(ana)	-0.3 to 6.3	V
Error Amp. Output Sink current	I_sink(EA)	10	mA
Power Dissipation	P_d	1	W

note) All voltages are with respect to PIN5, and current are positive into the specified pin.

S3843 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

S3843 Connection Diagram

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