GM3845AS8T datasheet(5/8 Pages) GAMMA

Part #	GM3845AS8T

Description	CURRENT MODE PWM CONTROLLER

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Manufacturer	GAMMA [Gamma Microelectronics Inc.]

Direct Link	http://www.gammamicro.com.tw/

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GM3842A, GM3843A

GM3844A, GM3845A

CURRENT MODE PWM CONTROLLER

Electrical Characteristics (T

A = 0°C to 70°C, VCC=15V, CT=3.3nF, RT=10k , unless otherwise

specified)

Parameter

Symbol

Condition

Min

Typ

Max

Unit

Undervoltage Lockout Section

GM3842A, GM3844A

14.5

16.0

17.5

Start Threshold

VTH(ST)

GM3843A, GM3845A

7.8

8.4

9.0

V

GM3842A, GM3844A

8.5

10

11.5

Minimum Operating

Voltage (after turn on)

VOPR(MIN)

GM3843A, GM3845A

7.0

7.6

8.2

V

PWM Section

GM3842A, GM3844A

95

97

100

Maximum Duty Cycle

D(MAX)

GM3843A, GM3845A

47

45

50

%

Minimum Duty Cycle

D(MIN)

0

%

Total Standby Current

Start-Up Current

IST

0.17

0.3

mA

Operating Supply

Current

ICC(OPR)

VPIN3 = VPIN2 = 0V

13

17

mA

Zero Voltage

VZ

ICC = 25mA

30

35

V

* Adjust VCC above the Startup threshold before setting to l5 V.

Note 1:

Parameter measured at trip point of latch with VPIN2 = 0V

Note 2:

Gain defined as A = VPIN1 / VPIN3; 0V

< VPIN3 < 0.5V

Note 3:

These parameters, although quaranteed, are not 1005 tested in production

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GM3845AS8T Datasheet(PDF) 5 Page - Gamma Microelectronics Inc.

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