© 2005 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN7547A Rev. 1.0.3

5

Electrical Characteristics

Unless otherwise noted, these specifications apply to the operating ambient temperatures for the FAN7547A with

-25

°C ≤ T

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

UVLO SECTION

Start Voltage

4.9

5.4

5.9

V

Start Current

50

200

μA

Operating Current

5.5

8.0

mA

REFERENCE SECTION

Reference Voltage

2.95

3.05

3.15

V

SOFT-START SECTION

Soft -Start Charge Current

33

40

47

μA

PWM Discharge Current

48

70

85

μA

OSCILLATOR SECTION

Operating Frequency

170

200

230

Hz

Osc High Voltage

1.3

V

Osc Low Voltage

0.1

V

DIMMING SECTION

Analog Dimming Range

03

V

3V

PWM Dimming Range

2.1

2.5

2.9

V

02.5

V

Mixed Dimming Range

1.2

3.0

V

03

V

MODE SELECTION

Analog Dimming Select Voltage

1.5

2.0

2.5

V

PWM Dimming Select Voltage

0.7

1.0

1.3

V

Mixed Dimming Select Voltage

1.2

1.5

1.8

V

OPEN-LAMP PROTECTION

Open-Lamp Detect Voltage

2.5

3.0

3.5

V

SHUTDOWN PROTECTION

Shutdown Current

123

μA

Shutdown Voltage

2.5

3.0

3.5

V

OUTPUT SECTION

Output High Voltage

8

9

10

V

Output Low Voltage

1

V

Rising Time

120

200

ns

Falling Time

60

120

ns

Output Voltage with UVLO

Activated

2

4

V