Diodes AP8802 - Manual (Page 3)

AP8802
1A LED STEP-DOWN CONVERTER
AP8802
Document number: DS31766 Rev. 9 - 2
3 of 19
www.diodes.com
May 2012
© Diodes Incorporated
Absolute Maximum Ratings (T
A
= +25
°C) (Note 4)
Symbol Parameter Rating Unit
V
IN
V
IN
pin voltage -0.3 to +50 V
V SW SW voltage -0.3 to +50 V
V
CTRL
CTRL Pin Input Voltage -0.3 to +6 V
V SENSE SET Voltage (Note 5) +0.3 to -5 V
T
J Junction Temperature 150 o C
T
LEAD
Lead Temperature Soldering 300 o C
T
ST Storage Temperature Range -65 to +150 o C
Note: 4 All voltages unless otherwise stated are measured with respect to GND.
5. V
SENSE
is measured with respect to V
IN
.
Caution: Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are
stress ratings only; functional operation of the device at these or any other conditions exceeding those indicated in this
specification is not implied. Device reliability may be affected by exposure to absolute maximum rating conditions for extended
periods of time.
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 (T
A
= +25
°C)
Symbol Parameter Min Max Unit
V
IN
Operating input voltage relative to GND 8.0 48.0 V
V
CTRLDC Voltage range for 24% to 200% DC dimming relative to GND (Note 6) 0.3 2.5 V
V
CTRL
Voltage low for PWM dimming relative to GND 0 0.2 V
f OSC Maximum switching frequency (Note 7) — 625 kHz
T
A
Ambient temperature range -40 +105 °C
Duty Cycle Using inductor ≥ 100µH (Note 8) 0.10 0.95 —
Notes: 6. For 100% brightness either leave floating or connect to 1.25V relative to GND.
7. AP8802 will operate at higher frequencies but accuracy will be affected due to propagation delays and also increased power dissipation will occur
due to increased switching losses.
8. 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.