MC34844AEP Datasheet, PDF (25/62 Pages) Freescale Semiconductor, Inc – 10 Channel LED Backlight Driver with Integrated Power Supply

FUNCTIONAL DEVICE OPERATION
TYPICAL PERFORMANCE CURVES (TA=25°C)
MC34844
TYPICAL PERFORMANCE CURVES (T_A=25°C)
34844
25
95%
94%
93%
92%
91%
90%
Fs = 600KHz
89%
L=22uH, DCR=52mO
Schottky V12P10-E3/86A
88%
C_OUT = 2x4.7µF, 2x2.2µF/100V
FPWM=600Hz, 100% duty
87%
Load = 16 LEDs, 50mA/channel
86%
V_LED = 48V, ±1V /channel
85%
10 12 14 16 18 20 22 24 26 28 30
Vin, volts
Figure 9. Boost efficiency vs Input Voltage
50.50
50.45
50.40
50.35
50.30
50.25
Fs = 600KHz
L=22uH, DCR=52mO
Schottky V12P10-E3/86A
C_OUT = 2x4.7µF, 2x2.2µF/100V
FPWM=600Hz, 100% duty
Load = 16 LEDs, 50mA/channel
V_LED = 48V, ±1V /channel
50.20
50.15
50.10
50.05
50.00
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Vin, volts
Figure 10. Line Regulation, V_IN Changing
Analog Integrated Circuit Device Data
Freescale Semiconductor