AP8800_0912 Datasheet, PDF (4/13 Pages) Diodes Incorporated – 350mA LED Step-down Converter

Block Diagram
AP8800
350mA LED Step-down Converter
SET SW
V_IN
Voltage
Regulator
Sensing
Block
5V
CTRL
PWM/DC
Control
V_REF 1.25V
R
AP8800
GND
Figure 2: AP8800 Block Diagram
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V_IN
VSW
T_J
T_LEAD
T_ST
VIN pin voltage
SW voltage
Maximum Junction Temperature
Maximum Lead Temperature
Storage Temperature Range
-0.3~30
V
-0.3~30
V
125
o_C
300
o_C
-65 to +125
o_C
Caution:
The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not
be exceeded under any condition.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken
when handling and transporting these devices.
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Unit
T_A
Ambient Temperature Range
Duty Cycle Using Inductor ≥ 100µH (Note 3)
-40
85
ºC
0.1
0.95
Notes:
3. For most applications the LED current will be within 8% over the duty cycle range specified. Duty cycle accuracy is also dependent on
propagation delay. Smaller size inductors can be used but LED current accuracy may be greater than 8% at extremes of duty cycle. This is
most noticeable at low duty cycles (less than 0.1) or when the input voltage is high and only one LED is being driven.
AP8800 Rev. 4
DS31764
4 of 13
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DECEMBER 2009
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