Manual

AP8803
Document number: DS31970 Rev. 5 - 2
2 of 10
www.diodes.com
August 2012
© Diodes Incorporated
A
P8803
Pin Descriptions
Pin Name Function
SW Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
GND GND pin
SET Set Nominal Output Current Pin. Configure the output current of the device.
CTRL
Dimming and On/Off Control Input.
• Leave floating for normal operation.
(V
CTRL
= V
REF
= 1.25V giving nominal average output current I
OUTnom
= 0.1/R
S
)
• Drive to voltage below 0.2V to turn off output current
• Drive with DC voltage (0.3V < V
CTRL
< 1.25V) to adjust output current from 25% to 100% of I
OUTnom
• Input voltage of 0.2V or lower forces the device into low current standby mode and shuts off the output. A PWM signal
allows the output current to be adjusted above or below the level set by the resistor connected to SET input pin.
V
IN
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor.
Functional Block Diagram
Absolute Maximum Ratings (@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
V
IN
Continuous V
IN
pin voltage -0.3 to +30
V
Transient (t < 0.5s) 40
V
SW
SW voltage -0.3 to +30
V
Transient (t < 0.5s) 40
V
CTRL
CTRL pin input voltage -0.3 to +6 V
I
SW
Switch current 1.25 A
ESD
HBM
Human Body Model ESD 500 V
ESD
MM
Machine Model ESD <100 V
T
J
Junction Temperature 150 °C
T
LEAD
Lead Temperature Soldering 300 °C
T
ST
Storage Temperature Range -65 to +150 °C
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