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Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
adequate for oscillator frequencies in the 166Hz < f PLL
< 500Hz range. The PLL frequency capture window is
0.6 x f PLL to f PLL .
The PLL is disabled in DPWM mode; consequently, the
BRT frequency is not limited by f PLL . The maximum
BRT frequency is determined by the minimum BRT on-
time of 50μs and the minimum acceptable dimming
factor. If a 1% dimming factor is needed, the maximum
BRT frequency is 200Hz. If a 10% dimming factor is
acceptable, the maximum BRT frequency is 2kHz.
In analog dimming mode, load-current transients can
occur when the BRT duty cycle abruptly changes on
the fly. Large regulation transients induce a flash on the
LED load that is observable with the naked eye and
should therefore be avoided. Such annoying flashes
can be eliminated by dynamically changing the ENA
Table 3. Component List
pin setting. When a capacitor is connected to the CPLL
pin and the ENA pin is grounded, the PLL continues to
run but does not affect the dimming. When fast PLL
lockup transitions are required, the ENA pin can be
momentarily pulled to ground; after the PLL is locked
up, ENA can be pulled high to reenable PLL in dim-
ming control.
Thermal Shutdown
The MAX8790 includes a thermal-protection circuit.
When the local IC temperature exceeds +170°C (typ),
the controller and current sources shut down and do
not restart until the die temperature drops by 15°C.
Design Procedure
All MAX8790 designs should be prototyped and tested
prior to production. Table 3 provides a list of power
CIRCUIT
Switching
Frequency
White LED
Number of
White LEDs
FIGURE 1
1MHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
6 series x 6 parallel,
20mA (max)
FIGURE 1
750kHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
8 series x 6 parallel,
20mA (max)
FIGURE 1
500kHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
10 series x 6 parallel,
25mA (max)
FIGURE 3
750kHz
3.2V (typ), 3.5V (max) at
20mA
Nichia NSSW008C
6 series x 6 parallel,
20mA (max)
Input Voltage 4.5V to 5.5V, V CC = IN
7V to 21V
7V to 21V
2.8V to 5.5V, V CC = 5V
Inductor L1
2.2μH, 2.5A power inductor
Sumida CDRH5D16-2R2
4.7μH, 2.05A power inductor
Sumida CDRH5D16-4R7
4.7μH, 3.6A power inductor
Sumida CDRH8D28-4R7
0.9μH, 4.7A power inductor
Sumida CDRH5D16-0R9
Input
Capacitors
10μF ±10%, 10V X5R 10μF ±10%, 25V X5R 10μF ±10%, 25V X5R
ceramic capacitor (1206) ceramic capacitor (1206) ceramic capacitor (1206)
Murata GRM31MR61A106K Murata GRM31CR61E106KA Murata GRM31CR61E106KA
10μF ±10%, 10V X5R
ceramic capacitor (1206)
Murata GRM31MR61A106K
C OUT Output
Capacitor
2.2μF ±10%, 50V X7R
ceramic capacitor (1x)
Murata GRM31CR71H225K
2.2μF ±10%, 50V X7R
ceramic capacitor (1206)
(1x)
Murata GRM31CR71H225K
4.7μF ±10%, 50V X7R
ceramic capacitor (1210)
(1x)
Murata GRM32ER71H475K
2.2μF ±10%, 50V X7R
ceramic capacitor (1x)
Murata GRM31CR71H225K
60V, 2.8A n-channel
MOSFET N1
30V, 3A n-channel MOSFET
(6-pin SC70)
Vishay Si1402DH
MOSFET (6-pin TSOP)
Fairchild Semiconductor
FDC5612
Sanyo Semiconductor
60V, 6A n-channel MOSFET
(PowerPAK 1212-8)
Vishay Si7308DN
30V, 4.9A n-channel
MOSFET (6-pin TSOP)
Vishay Si3456BDV
CPH6424
Diode
Rectifier D1
Sense
Resistor
2A, 30V Schottky diode
Nihon EC21QS03L
50m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R050-F
2A, 40V Schottky diode
Toshiba CMS11
Nihon EC21QS04
56m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R056-F
3A, 60V Schottky diode
Nihon EC31QS06
40m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R040-F
3A, 30V Schottky diode
Nihon EC31QS03L
30m Ω ±1%, 1/2W
IRC LRC-LRF-1206LF-01-
R030-F
16
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