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AP8803WTG-7

P1-P3P4-P6P7-P9P10-P10
AP8803
Document number: DS31970 Rev. 5 - 2
1 of 10
www.diodes.com
August 2012
© Diodes Incorporated
A
P8803
30V 1A BUCK LED DRIVER
Description
The AP8803 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 7 LEDs,
depending on the forward voltage of the LEDs, in series from a
voltage source of 8V to 30V. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AP8803 switches at frequency up
to 700kHz. This allows the use of small size external components,
hence minimizing the PCB area needed.
Maximum output current of AP8803 is set via an external resistor
connected between the V
IN
and SET input pins. Dimming is achieved
by applying either a DC voltage or a PWM signal at the CTRL input
pin. An input voltage of 0.2V or lower at CTRL shuts down the output
at SW and puts the device into a low-current standby state.
Features
• LED Driving Current up to 1A
• High Efficiency Up to 92%
• Operating Input Voltage Up to 30V
• High Switching Frequency Up to 700kHz
• PWM/DC Input for Dimming Control
• Built-In Output Open-Circuit Protection
• TSOT25: Available in “Green” Molding Compound (No Br, Sb)
with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
1
2
3
4
5
SET
V
IN
CTRL
GND
SW
Top View
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen and Antimony free, "Green" and Lead-Free.
3. Halogen and Antimony free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Applications Circuit
L1
R
SET
C1
AP8803
CTRL
V
IN
SET
SW
GND
12V_DC
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
AP8803
Document number: DS31970 Rev. 5 - 2
3 of 10
www.diodes.com
August 2012
© Diodes Incorporated
A
P8803
Recommended Operating Conditions (@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Min Max Unit
V
IN
Operating Input Voltage 8.0 30 V
V
CTRLH
Voltage High 0.3 2.5 V
V
CTRLL
Voltage Low 0.25 V
I
SW
Continuous Switch Current (Note 5) 1 A
T
A
Ambient Temperature Range -40 +125 °C
Duty Cycle Using Inductor ≥ 100µH (Note 4) 0.1 0.95
Notes: 4. 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.
5. Refer to Figure 8 for the device derating curve.
Electrical Characteristics (@T
A
= +25°C, unless otherwise specified.)
Symbol Parameter Conditions Min Typ Max Unit
V
INSU
Internal Regulator Start-Up Threshold V
IN
rising 5.65 V
V
INSD
Internal Regulator Shutdown Threshold V
IN
falling 5.55 V
I
Q
Quiescent Current CTRL pin floating f = 250kHz 1.8 5 mA
V
THD
Internal Threshold Voltage 92 100 108 mV
I
SET
SET Pin Input Current V
SET
= V
IN
-0.1 1.25 10 µA
V
REF
Internal Reference Voltage 1.25 V
R
DS(on)
On Resistance of MOSFET I
SW
= 1A 0.5 1 Ω
I
SW
Continuous Switch Current (Note 5) 1 A
I
SW_Leakage
Switch Leakage Current 8 µA
f
OSC
Switching Frequency 0.7 MHz
θ
JA
Thermal Resistance Junction-to-
Ambient
TSOT25 (Note 6) 125 °C/W
Notes: 5. Refer to Figure 8 for the device derating curve.
6. Test condition for TSOT25: Device mounted on FR-4 PCB, 25mm x 25mm, 2oz copper, minimum recommended pad layout on top layer and
thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
P1-P3P4-P6P7-P9P10-P10

AP8803WTG-7

Mfr. #:
Buy AP8803WTG-7
Manufacturer:
Diodes Incorporated
Description:
LED Lighting Drivers BUCK LED DRIVER 30V 3W
Lifecycle:
New from this manufacturer.
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