© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSL137H Rev. 1.0.0

6

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

PWM Turn-on Threshold Voltage

0.98

1.03

1.08

V

Release Latch Voltage

0.65

0.70

0.75

V

Pull HIGH Latch Trigger Level

4.4

4.7

5.0

V

Pull HIGH Latch Debounce Time

100

µs

Pull LOW Auto Recovery Trigger Level

0.2

0.3

0.4

V

Feedback Input Section

FB Voltage to Current-Sense Attenuation

1/4.0

V/V

Input Impedance

9

kΩ

Output High Voltage

5

V

FB Open-Loop Trigger Level

4.4

4.6

4.8

V

Delay Time of FB Pin Open-loop

Protection

50

56

59

ms

Green-Mode Entry FB Voltage

2.3

2.5

2.7

V

Green-Mode Ending FB Voltage

0.1

V

Zero Duty Cycle FB Voltage

1.9

2.1

2.3

V

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Current-Sense Section

Peak Current Limit

0.8

A

Peak Current Limit

0.65

A

Period during Soft Startup Time

(9)

4.5

5.0

5.5

ms

Over-Temperature Protection Section (OTP)

Protection Junction Temperature

(9, 11)

142

°C

Notes:

9.

These parameters, although guaranteed, are not 100% tested in production.

10. Pulse test: pulse width ≤ 300μs, duty ≤ 2%.

11. When activated, the output is disabled and the latch is turned off.

12. These parameters, although guaranteed, are tested in wafer process.

PWM Frequency