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Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
Typical Operating Characteristics (continued)
(Circuit configuration 1, V IN = 12V, V SHDN = V IN , LEDs = 8 series x 6 parallel strings, ISET = V CC , T A = +25°C, unless otherwise noted.)
LED-SHORT FAULT PROTECTION
(BRT = 100%, 2 LEDs SHORT ON FB3)
LED CURRENT BALANCING
vs. INPUT VOLTAGE (BRT = 100%)
MAX8790A toc17
0V
0V
V FB3
1V/div
V FB1
10V/div
1.00
0.90
0.80
0.70
0.60
V OUT
0V 20V/div
0.50
0.40
1MHz
10ms/div
0A
I L
1A/div
0.30
0.20
0.10
0
7
750kHz
12 17
500kHz
INPUT VOLTAGE (V)
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
OSC
ENA
BRT
SHDN
FB1
FB2
FB3
GND
FB4
FB5
FUNCTION
Oscillator Frequency Selection Pin. Connect OSC to V CC to set the step-up converter’s oscillator frequency to
1MHz. Connect OSC to GND to set the frequency to 500kHz. Float OSC to set the frequency to 750kHz.
Analog Dimming Enable. ENA sets the PWM control mode. Set ENA LOW to enable direct DPWM dimming.
Set ENA HIGH to enable analog dimming. In both modes, the duty cycle of the PWM signal at the BRT input
controls the LED current characteristics. See the Dimming Control section for a complete description.
Brightness Control Input. The duty cycle of this digital input signal controls the LED current characteristics.
The allowable frequency range is 100Hz to 500Hz in analog dimming mode. The duty cycle can be 100%
to 1%. The BRT frequency can go above 500Hz in direct DPWM mode as long as the BRT pulse width is
greater than 50μs minimum. See the Dimming Control section for a complete description.
Shutdown Control Input. The MAX8790A shuts down when SHDN is less than 0.8V. Pulling SHDN above
2.1V enables the MAX8790A. SHDN can be connected to the input voltage if desired.
LED String 1 Cathode Connection. FB1 is the open-drain output of an internal regulator, which controls
current through FB1. FB1 can sink up to 27mA. If unused, connect FB1 to GND.
LED String 2 Cathode Connection. FB2 is the open-drain output of an internal regulator, which controls
current through FB2. FB2 can sink up to 27mA. If unused, connect FB2 to GND.
LED String 3 Cathode Connection. FB3 is the open-drain output of an internal regulator, which controls
current through FB3. FB3 can sink up to 27mA. If unused, connect FB3 to GND.
Ground
LED String 4 Cathode Connection. FB4 is the open-drain output of an internal regulator, which controls
current through FB4. FB4 can sink up to 27mA. If unused, connect FB4 to GND.
LED String 5 Cathode Connection. FB5 is the open-drain output of an internal regulator, which controls
current through FB5. FB5 can sink up to 27mA. If unused, connect FB5 to GND.
8
_______________________________________________________________________________________
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