Rainbow Electronics MAX1611 - Manual (Page 11)

MAX1610/MAX1611
Digitally Controlled CCFL Backlight
Power Supplies
______________________________________________________________________________________ 11
6V
-1A
5µs/div
0V
1A
T1
CENTER-TAP
VOLTAGE
C1
CURRENT
BATT = 10V, I BATT = 0.20A,
MINDAC = 0.5V, D/A VALUE = 11111
FIGURE 4 CIRCUIT, C2 = 15pF, I R1 = 462mA,
CCFL VL = 500V RMS
3V
0V
10ms/div
0V
6V
SS
VOLTAGE
T1
CENTER-TAP
VOLTAGE
FIGURE 4 CIRCUIT, C2 = 15pF,
R1 = 545
Ω ,
CCFL VL = 500V RMS , BATT = 15V,
MINDAC = 0.5V, D/A VALUE = 10000
Figure 5. Royer Oscillator Typical Operating Waveforms for
Circuit of Figure 4 Figure 6. Start-Up Waveforms for Circuit of Figure 4
MID-SCALE
REF / 8 = 250mV
FULL-SCALE
MIN-SCALE = MINDAC / 8
OmV
DAC CODE
CSAV REGULATION VOLTAGE
NOTE: DAC CODE 00000 FORCES THE BATT-TO-LX SWITCH OFF REGARDLESS OF CSAV OR MINDAC VOLTAGE.
00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111
Figure 7. CSAV Regulation Voltage Range