UC3845G-S08-T 查看數據表（PDF） - Unisonic Technologies

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UC3845G-S08-T

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

Unisonic Technologies 

UC3844/45

LINEAR INTEGRATED CIRCUIT

„ ELECTRICAL CHARACTERISTICS(Cont.)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN TYP MAX UNIT

CURRENT SENSE SECTION

Current Sense Input Voltage Gain

GV

(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 V

Input Bias Current

II(BIAS)

-2.0 -10 μA

Power Supply Rejection Ratio

PSRR VCC=12V ~ 25V (Note4)

70

dB

Propagation Delay

OUTPUT SECTION

tPLH(IN/OUT)

150 300 ns

Output Voltage

Low

High

VOL

ISINK=20mA

ISINK=200mA

VOH

ISINK=20mA

ISINK=200mA

0.1 0.4

V

1.6 2.2

13 13.5

V

12 13.4

Output Voltage with UVLO Activated

VOL(UVLO)

Output Voltage Rise Time

tR

Output Voltage Fall Time

tF

UNDERVOLTAGE LOCKOUT SECTION

VCC=6.0V, ISINK=1.0mA

CL=1.0nF,TJ=25°C

CL=1.0nF,TJ=25°C

0.1 1.1 V

50 150 ns

50 150 ns

Startup Threshold

UC3844

UC3845

VTHR

14.5 16.0 17.5 V

7.8 8.4 9.0

Minimum Operating

Voltage After Turn-On

UC3844

UC3845

VCC(MIN)

8.5

10.0 11.5

V

7.0 7.6 8.2

PWM SECTION

Duty Cycle

Max

Min

DCMAX

DCMIN

47

48

50

%

0

%

TOTAL DEVICE

Power Supply Zener Voltage

VZ

ICC=25mA

30

36

-

V

Power Supply Current

(Note 4)

UC3845

UC3844

ICC

VCC=6.5V

VCC=14V

0.5 1.0

mA

12

17

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: ΔV Output Compensation

AV=

ΔV Current Sense Input

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

UNISONIC TECHNOLOGIES CO., LTD

www.unisonic.com.tw

5 of 7

QW-R103-010.D

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