FAN7547A LCD Backlight Inverter Drive IC
© 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
A
≤ 85°C and V
CC
= 10V.
Symbol Parameter Conditions Min. Typ. Max. Unit
UVLO SECTION
V
ST
Start Voltage 4.9 5.4 5.9 V
I
ST
Start Current V
CC
= 4.5V 50 200 μA
I
CC
Operating Current 7V < V
CC
< 30V 5.5 8.0 mA
REFERENCE SECTION
V
ref
Reference Voltage T
J
= 25°C, I
ref
= 0mA, 7V < V
CC
< 30V 2.95 3.05 3.15 V
SOFT-START SECTION
I
SS
Soft -Start Charge Current C
SS
= 4V 33 40 47 μA
I
pwm
PWM Discharge Current C
SS
= 4V 48 70 85 μA
OSCILLATOR SECTION
f
pwm
Operating Frequency 7V < V
CC
< 30V 170 200 230 Hz
V
pwmh
Osc High Voltage 1.3 V
V
pwmI
Osc Low Voltage 0.1 V
DIMMING SECTION
V
a
Analog Dimming Range V
ms
> 2V
03V
V
b
3V
V
a
PWM Dimming Range V
ms
< 1V
2.1 2.5 2.9 V
V
b
02.5V
V
a
Mixed Dimming Range V
ms
=1.5V or open
1.2 3.0 V
V
b
03V
MODE SELECTION
V
sa
Analog Dimming Select Voltage 1.5 2.0 2.5 V
V
sp
PWM Dimming Select Voltage 0.7 1.0 1.3 V
V
sc
Mixed Dimming Select Voltage 1.2 1.5 1.8 V
OPEN-LAMP PROTECTION
V
open
Open-Lamp Detect Voltage 7V < V
CC
< 30V 2.5 3.0 3.5 V
SHUTDOWN PROTECTION
I
sd
Shutdown Current 7V < V
CC
< 30V 123μA
V
sd
Shutdown Voltage 2.5 3.0 3.5 V
OUTPUT SECTION
V
OH
Output High Voltage V
CC
= 10V 8 9 10 V
V
OL
Output Low Voltage V
CC
= 10V 1 V
t
r
Rising Time V
CC
= 10V 120 200 ns
t
f
Falling Time V
CC
= 10V 60 120 ns
V
UV
Output Voltage with UVLO
Activated
V
CC
= 4V 2 4 V
