GM3842A 查看數據表（PDF） - Gamma Microelectronics Inc.

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GM3842A

CURRENT MODE PWM CONTROLLER

Gamma Microelectronics Inc. 

GM3842A, GM3843A

GM3844A, GM3845A

CURRENT MODE PWM CONTROLLER

Electrical Characteristics (TA = 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

Start Threshold

Minimum Operating

Voltage (after turn on)

VTH(ST)

GM3842A, GM3844A

GM3843A, GM3845A

GM3842A, GM3844A

VOPR(MIN)

GM3843A, GM3845A

14.5

16.0 17.5

V

7.8

8.4 9.0

8.5

10 11.5

V

7.0

7.6 8.2

PWM Section

Maximum Duty Cycle

D(MAX)

Minimum Duty Cycle

D(MIN)

Total Standby Current

GM3842A, GM3844A

GM3843A, GM3845A

95

97 100

%

47

45

50

0

%

Start-Up Current

IST

Operating Supply

Current

ICC(OPR) VPIN3 = VPIN2 = 0V

Zero Voltage

VZ

ICC = 25mA

30

* 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

0.17 0.3 mA

13

17

mA

35

V

5

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