UC3845G-S08-R datasheet(5/7 Pages) UTC

5 / 7 page

UC3844/45

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

5 of 7

www.unisonic.com.tw

QW-R103-010.H



ELECTRICAL CHARACTERISTICS(Cont.)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT SENSE SECTION

Current Sense Input Voltage Gain

(Note 2, 3)

2.85

3.0

3.15

V/V

Maximum Current Sense Input

Threshold (Note 2)

VI(THR)

0.9

1.0

1.1

Input Bias Current

II(BIAS)

-2.0

-10

μA

Power Supply Rejection Ratio

PSRR

VCC=12V ~ 25V (Note 4)

Propagation Delay

tPLH(IN/OUT)

150

300

OUTPUT SECTION

Output Voltage

Low

VOL

ISINK=20mA

0.1

0.4

ISINK=200mA

1.6

2.2

High

VOH

ISINK=20mA

13.5

ISINK=200mA

13.4

Output Voltage with UVLO Activated

VOL(UVLO)

VCC=6.0V, ISINK=1.0mA

0.1

1.1

Output Voltage Rise Time

CL=1.0nF,TJ=25°C

150

Output Voltage Fall Time

CL=1.0nF,TJ=25°C

150

UNDERVOLTAGE LOCKOUT SECTION

Startup Threshold

UC3844

VTHR

14.5

16.0

17.5

UC3845

7.8

8.4

9.0

Minimum Operating

Voltage After Turn-On

UC3844

VCC(MIN)

8.5

10.0

11.5

UC3845

7.0

7.6

8.2

PWM SECTION

Duty Cycle

MAX

DCMAX

MIN

DCMIN

TOTAL DEVICE

Power Supply Zener Voltage

ICC=25mA

Power Supply Current

(Note 4)

UC3845

ICC

VCC=6.5V

0.5

1.0

UC3844

VCC=14V

Startup Current

ISTART-UP

VCC=14V, UVLO Active

0.3

0.5

Notes: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient

as possible.

2.This parameter is measured at the latch trip point with VFB=0V.

3.Comparator gain is defined as:

V Output Compensation

AV=

V Current Sense Input

4. Adjust VCC above the startup threshold before setting to 15V.

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