© 2007 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FSFR series • 1.0.3

7

Specifications

Unit

Symbol

Parameter

Test Conditions

Min

Typ

Max

Oscillator & Feedback Section

0.36

0.40

0.44

V

Control Pin Enable Threshold Voltage

0.54

0.60

0.66

V

V-I Converter Threshold Voltage

1.5

2.0

2.5

V

Output Oscillation Frequency

94

100

106

KHz

DC

Output Duty Cycle

48

50

52

%

Internal Soft-Start Initial Frequency

140

KHz

Internal Soft-Start Time

2

3

4

ms

Protection Section

OLP Delay Current

3.6

4.8

6.0

μA

OLP Protection Voltage

4.5

5.0

5.5

V

L-Vcc > 21V

21

23

25

V

AOCP Threshold Voltage

ΔV/Δt=-0.1V/µs

-1.0

-0.9

-0.8

V

AOCP Blanking Time

(5)

ΔV/Δt=-0.1V/µs

50

ns

OCP Threshold Voltage

V/

Δt=-1V/µs

-0.64

-0.58

-0.52

V

OCP Blanking Time

(5)

ΔV/Δt=-1V/µs

1.0

1.5

2.0

μs

to Switch Off

(5)

ΔV/Δt=-1V/µs

250

400

ns

Thermal Shutdown Temperature

(5)

110

130

150

°C

Current

LVcc=7.5V

100

150

μA

5

V

Dead-Time Control Section

Dead Time

(6)

350

ns

Notes:

5.

This parameter, although guaranteed, is not tested in production.

6.

These parameters, although guaranteed, are tested only in EDS (wafer test) process.