UC2843B datasheet(6/9 Pages) UTC

Part #	UC2843B

Description	HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS

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Manufacturer	UTC [Unisonic Technologies]

Direct Link	http://www.utc-ic.com

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6 / 9 page

UC2843B

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 9

www.unisonic.com.tw

QW-R103-048.a

ELECTRICAL CHARACTERISTICS (Cont.)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX UNIT

UNDERVOLTAGE-LOCKOUT SECTION

Startup Threshold

VTH

7.8

8.4

9

V

Minimum Operating Voltage

After Start-Up

VCC(MIN)

7

7.6

8.2

V

PULSE-WIDTH MODULATOR SECTION

Maximum Duty Cycle

DC(MAX)

94

96

100

%

Minimum Duty Cycle

DC(MIN)

0

%

SUPPLY VOLTAGE

Power Startup Supply Current

ICC+IC

0.3

0.5

mA

Power Operating Supply Current

ICC+IC

VFB and ISENSE at 0V

11

17

mA

Power Supply Zener Voltage

VZ

ICC =25mA

30

34

V

Notes: 1. Adjust VCC above the start threshold before setting it to 15V.

2. Measured at the trip point of the latch, with VFB at 0V.

3. Measured between ISENSE and COMP, with the input changing from 0V ~ 0.8V.

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