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UC2842AQ Datasheet Preview

UC2842AQ Datasheet

CURRENT-MODE PWM CONTROLLER

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UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
D Extended Temperature Performance of
–40°C to 125°C
D Optimized for Off-line and DC to DC
Converters
D Low Start Up Current (<0.5 mA)
D Trimmed Oscillator Discharge Current
D Automatic Feed Forward Compensation
D Pulse-by-Pulse Current Limiting
D Enhanced Load Response Characteristics
D Under-Voltage Lockout With Hysteresis
D Double Pulse Suppression
D High Current Totem Pole Output
D Internally Trimmed Bandgap Reference
D 500 kHz Operation
D Low RO Error Amp
description
SGLS164 – APRIL 2003
D 8-PIN PACKAGE
(TOP VIEW)
COMP
VFB
ISENSE
RT/CT
1
2
3
4
8 VREF
7 VCC
6 OUTPUT
5 GND
D 14-PIN PACKAGE
(TOP VIEW)
COMP
NC
VFB
NC
ISENSE
NC
RT/CT
1
2
3
4
5
6
7
14 VREF
13 NC
12 VCC
11 VC
10 OUTPUT
9 GND
8 PWR GND
The UC2842A/3A/4A/5A family of control ICs is a pin for pin compatible improved version of the UC2842/3/4/5
family. Providing the necessary features to control current mode switched mode power supplies, this family has the
following improved features. Start up current is guaranteed to be less than 0.5 mA. Oscillator discharge is trimmed
to 8.3 mA. During under voltage lockout, the output stage can sink at least 10 mA at less than 1.2 V for VCC over
5 V.
The difference between members of this family are shown in the table below.
PART NUMBER
UC2842A
UC2843A
UC2844A
UC2845A
UVLO ON
16 V
8.5 V
16 V
8.5 V
UVLO OFF
10 V
7.9 V
10 V
7.9 V
MAXIMUM DUTY CYCLE
<100%
<100%
<50%
<50%
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright 2003, Texas Instruments Incorporated
1




etcTI

UC2842AQ Datasheet Preview

UC2842AQ Datasheet

CURRENT-MODE PWM CONTROLLER

No Preview Available !

UC2842AQ, UC2843AQ, UC2844AQ, UC2845AQ
CURRENT-MODE PWM CONTROLLER
SGLS164 APRIL 2003
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SOIC-8 D8 Tape and reel UC2842AQD8R
2842AQ
SOIC-8 D8 Tube
UC2842AQD8
2842AQ
SOIC-14 D Tape and reel UC2842AQDR
2842AQ
SOIC-14 D Tube
UC2842AQD
2842AQ
SOIC-8 D8 Tape and reel UC2843AQD8R
2843AQ
SOIC-8 D8 Tube
UC2843AQD8
2843AQ
SOIC-14 D Tape and reel UC2843AQDR
2843AQ
SOIC-14 D
40°C to 125°C
SOIC-8 D8
Tube
Tape and reel
UC2843AQD
UC2844AQD8R
2843AQ
2844AQ
SOIC-8 D8 Tube
UC2844AQD8
2844AQ
SOIC-14 D Tape and reel UC2844AQDR
2844AQ
SOIC-14 D Tube
UC2844AQD
2844AQ
SOIC-8 D8 Tape and reel UC2845AQD8R
2845AQ
SOIC-8 D8 Tube
UC2845AQD8
2845AQ
SOIC-14 D Tape and reel UC2845AQDR
2845AQ
SOIC-14 D Tube
UC2845AQD
2845AQ
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
block diagram
NOTES: 1. A = DIL-8 Pin Number. B = SO-14 Pin Number.
2. Toggle flip flop used only in 2844A and 2845A.
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number UC2842AQ
Description CURRENT-MODE PWM CONTROLLER
Maker etcTI
Total Page 17 Pages
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