AAT1239-1_0810 Datasheet, PDF (6/23 Pages) Advanced Analogic Technologies – 40V Step-Up Converter for 4 to 10 White LEDs

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Typical Characteristics
Soft Start
(10 White LEDs; V_FB = 0.6V)
0.6
3.3V
0.4
0V
0.2
0
2
1
0
Time (200µs/div)
PRODUCT DATASHEET
AAT1239-1
40V Step-Up Converter for 4 to 10 White LEDs
Soft Start
(10 White LEDs; V_FB = 0.3V)
0V 0V
3.3V
0.4
0.2
0
2
1
0
Time (200µs/div)
Shutdown
(10 White LEDs; V_FB = 0.6V)
3.3V
0V
0.6
0.4
0.2
0
0.5
0.0
Time (100µs/div)
Shutdown
(10 LEDs; V_FB = 0.3V)
3.3V
0V
0.4
0.2
0
0.5
0
Time (50µs/div)
Output Ripple
(10 White LEDs; V_IN = 3.6V; C_OUT = 2.2µF; I_LED = 13mA)
V_OUT
(AC Coupled)
(20mV/div)
V_SW
(20V/div)
I_L
(500mA/div)
Time (200ns/div)
Output Ripple
(10 White LEDs; V_IN = 3.6V; C_OUT = 2.2µF; I_LED = 20mA)
V_OUT
(AC Coupled)
(20mV/div)
V_SW
(20V/div)
I_L
(500mA/div)
Time (200ns/div)
6
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1239-1.2008.10.1.2