FAN7346 Datasheet, PDF (5/19 Pages) Fairchild Semiconductor – 4-Channel LED Current Balance Controller

Electrical Characteristics
For typical values; T_A = 25°C, V_IN = 12V, and -25°C  T_A  85°C, unless otherwise specified. Specifications to -40°C ~
125°C are guaranteed by design based on final characterization results.
Symbol
Parameter
Condition
Under-Voltage Lockout Section (UVLO)
V_th
Start Threshold Voltage
V_thhys
Start Threshold Voltage Hysteresis
I_st
Startup Current
I_op
Operating Supply Current
ON/OFF Section
V_IN=8V
V_IN=12V, Not Switching
V_on
On-State Input Voltage
V_off
Off-Stage Input Voltage
R_ENA
Pull-Down Resistor
Reference Section (Recommend 1µF X7R Capacitor)
V_REF
5V Regulation Voltage
I_REF=0mA
V_R-LINE 5V Line Regulation
V_R-LOAD 5V Load Regulation
V_DD
8.5V Regulation Voltage
LED Current Section
10  V_IN  35V
0  I_REF  3mA
V_IN=12V
V_FBX
CH LED Current Reference Voltage V_ADIM=2V
V_LREF LED Current Reference Voltage
0.5V  V_ADIM  4V
V_ADIM-CLAMPH ADIM Voltage HIGH Clamping Voltage
V_ADIM-CLAMPL ADIM Voltage LOW Clamping Voltage
B_CH
Current Balance Between Channels
Headroom Voltage Feedback Section
V_IN=12V
V_IN=12V
V_ADIM=2V
V_FBR
I_leak
A_V
G_m
Feedback Reference Voltage
Channel Leakage Current
Open-Loop Gain⁽³⁾
Error Amplifier Transconductance
PWM ON, V_CH=1V
PWM OFF, V_CH=30V
V_VMIN=1V
V_VMIN=1.5V
l_sin
Output Sink Current
l_sur
Output Source Current
V_VMIN=0V
V_VMIN=2V
Min. Typ. Max. Unit
8.5
9.5
10.5
V
0.5
1.0
1.5
V
100
300
µA
1
3
mA
1.4
5.0
V
0.7
V
130
200
270
kΩ
4.9
5.0
5.1
V
50
mV
50
mV
8.0
8.5
9.0
V
194
200
206
mV
V_ADIM
/10
V
3.84 4.00 4.16
V
0.45 0.50 0.55
-1.5
1.5
%
0.95 1.00 1.05
V
0
100
µA
0
2
µA
65
dB
140
180
220 µmho
70
120
170
µA
70
120
170
µA
Continued on the following page…
© 2011 Fairchild Semiconductor Corporation
FAN7346 • 1.0.0
5
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