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UC2842A

ST Microelectronics
Part Number UC2842A
Manufacturer ST Microelectronics
Description (UC2842A - UC2845A) HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Published Jan 19, 2006
Detailed Description UC284XA UC384XA HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER NOT FOR NEW DESIGN 1 FEATURES Figure 1. Package ■ TRIM...
Datasheet PDF File UC2842A PDF File

UC2842A
UC2842A

Overview
UC284XA UC384XA HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER NOT FOR NEW DESIGN 1 FEATURES Figure 1.
Package ■ TRIMMED OSCILLATOR DISCHARGE CURRENT ■ CURRENT MODE OPERATION TO 500kHz AUTOMATIC FEED FORWARD COMPENSATION DIP-8 SO-8 ■ LATCHING PWM FOR CYCLE-BY-CYCLE CURRENT LIMITING Table 1.
Order Codes ■ INTERNALLY TRIMMED REFERENCE WITH Part Number Package UNDERVOLTAGE LOCKOUT ■ HIGH CURRENT TOTEM POLE OUTPUT t(s)UNDERVOLTAGE LOCKOUT WITH HYSTERESIS c■ LOW START-UP CURRENT (< 0.
5mA) uDOUBLE PULSE SUPPRESSION rod2 DESCRIPTION PThe UC384xA family of control ICs provides the necessary features to implement off-line or DC to teDC fixed frequency current mode control schemes lewith a minimal external parts count.
Internally imoplemented circuits include a trimmed oscillator for sprecise DUTY CYCLE CONTROL under voltage blockout featuring start-up current less than 0.
5mA, Oa precision reference trimmed for accuracy at the -error amp input, logic to insure latched operation, )a PWM comparator which also provides current t(slimit control, and a totem pole output stage decsigned to source or sink high peak current.
The uoutput stage, suitable for driving N-Channel MOSdFETs, is low in the off-state.
UC2842AD1; UC3842AD1; UC2843AD1; UC3843AD1; UC2844AD1; UC3844AD1; UC2845AD1; UC3845AD1 UC2842AN; UC3842AN; UC2843AN; UC3843AN; UC2844AN; UC3844AN; UC2845AN; UC3845AN SO-8 DIP-8 Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges.
The UC3842A and UC3844A have UVLO thresholds of 16V (on) and 10V (off), ideally suited off-line applications The corresponding thresholds for the UC3843A and UC3845A are 8.
5 V and 7.
9V.
The UC3842A and UC3843A can operate to duty cycles approaching 100%.
A range of the zero to < 50 % is obtained by the UC3844A and UC3845A by the addition of an internal toggle flip flop which blanks the output off every other clock cycle.
ProFigure 2.
Block Diagram (toggle flip flop used only ...


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