UC3842 Philips Current-mode PWM controller Data Sheet
Download PDF datasheet for Philips Semiconductors UC3842 Current-mode PWM controller (EN) 8 pages 853-0614 13721 1998 zip
Description
This PDF datasheet is for the Philips UC3842 PWM controller.
About the Item
Philips Semiconductors UC3842 Current-mode PWM controller
The UC3842 is available in an 8-Pin mini-DIP the necessary features to implement off-line, fixed-frequency current-mode control schemes with a minimal external parts count. This technique results in improved line regulation, enhanced load response characteristics, and a simpler, easier to design control loop. Topological advantages include inherent pulse-by-pulse current limiting.
Protection circuitry includes built-in undervoltage lock-out and current limiting. Other features include fully-latched operation, a 1% trimmed bandgap reference, and start-up current less than 1mA.
These devices feature a totem-pole output designed to source and sink high peak current from a capacitive load, such as the gate of a power MOSFET. Consistent with N-channel power devices, the output is low in the OFF-state.
FEATURES
– Low start-up current
– Automatic feed-forward compensation
– Pulse-by-pulse current limiting
– Enhanced load response characteristics
– Undervoltage lock-out with hysteresis
– Double pulse suppression
– High current totem-pole output
– Internally-trimmed bandgap reference
– 400kHz operation, guaranteed min
(PDF) DATASHEET (ENGLISH)
SUMMARY OF CONTENTS
PIN CONFIGURATIONS (UC3842 PINOUT)
APPLICATIONS
– Off-line switched mode power supplies
– DC-to-DC converters UC3842
BLOCK DIAGRAM
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
DC AND AC ELECTRICAL CHARACTERISTICS
– Reference section
– Oscillator section
– Error amp section
– Current sense section
– Output section
– Undervoltage lockout section
– PWM section
– Total standby current
– Maximum operating frequency section
UNDERVOLTAGE LOCKOUT
ERROR AMP CONFIGURATION
CURRENT SENSE CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
– Output Saturation Characteristics
– Error Amplifier Open-Loop Frequency Response
OPEN-LOOP LABORATORY TEST FIXTURE
SHUTDOWN TECHNIQUES
OFF-LINE FLYBACK REGULATOR
SPECIFICATIONS
SYNCHRONIZATION AND MAXIMUM DUTY CYCLE CLAMP
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