AP8802_0912 Datasheet, PDF (4/16 Pages) Diodes Incorporated – 1A LED Step-down Converter

Block Diagram
AP8802
1A LED Step-down Converter
SET SW
V_IN
CTRL
GND
PWM/DC
Control
V_REF 1.25V
Voltage
Regulator
Sensing
Block
5V
R
AP8802
Figure 2: AP8802 block diagram
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
V_IN
VSW
T_J
T_LEAD
T_ST
VIN pin voltage
SW voltage
Junction Temperature
Lead Temperature Soldering
Storage Temperature Range
-0.3~50
V
-0.3~50
V
150
o_C
300
o_C
-65 to +150
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
105
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.
AP8802 Rev. 5
DS31766
4 of 16
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DECEMBER 2009
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