UC3845G-S08-R datasheet(4/6 Pages) UTC

4 / 6 page

UC3844/45

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

4 of 6

www.unisonic.com.tw

QW-R103-010.G



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

Note: 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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