AP8800AWT-7 Diodes Inc, AP8800AWT-7 Datasheet

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AP8800AWT-7

Manufacturer Part Number
AP8800AWT-7
Description
LED Drivers 28V 1-W LED Driver DC/DC Converter
Manufacturer
Diodes Inc
Series
-r
Datasheet

Specifications of AP8800AWT-7

Constant Current
Yes
Constant Voltage
-
Topology
PWM, Step-Down (Buck)
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
General Purpose
Type - Secondary
-
Frequency
600kHz
Voltage - Supply
8 V ~ 28 V
Voltage - Output
-
Mounting Type
Surface Mount
Package / Case
SOT-23-5 Thin, TSOT-23-5
Operating Temperature
-40°C ~ 105°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
AP8800AWT-7
Quantity:
3 000
Features
Description
The AP8800A 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 28V. Series connection
of the LEDs provides identical LED currents resulting in
uniform brightness and eliminating the need for ballast
resistors. The AP8800A switches at frequency up to 600kHz.
This allows the use of small size external components, hence
minimizing the PCB area needed.
Maximum output current of AP8800A is set via an external
resistor connected between the V
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 switches off the output MOSFET simplifying
PWM dimming.
Notes:
Typical Application Circuit
AP8800A
Document number: DS35100 Rev. 2 - 2
LED driving current up to 370mA
Better than 5% accuracy
High efficiency up to 95%
Operating input voltage from 8V to 28V
Simple, versatile solution requiring only 4 components
PWM/DC input for dimming control
Built-in output open-circuit protection
TSOT23-5: Available in “Green” Molding Compound (No
Br, Sb) with lead Free Finish/ RoHS Compliant (Note 1)
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
IN
and SET input pins.
www.diodes.com
COST EFFECTIVE 28V BUCK 1-W LED DRIVER
1 of 12
Pin Assignments
Applications
MR16 lamps
General illumination lamps
CTRL
GND
SW
1
2
3
(Top View)
TSOT23-5
4
5
AP8800A
V
SET
IN
© Diodes Incorporated
January 2011

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AP8800AWT-7 Summary of contents

Page 1

... Typical Application Circuit AP8800A Document number: DS35100 Rev COST EFFECTIVE 28V BUCK 1-W LED DRIVER Pin Assignments GND CTRL and SET input pins. Applications • MR16 lamps • General illumination lamps www.diodes.com AP8800A (Top View SET 3 TSOT23-5 January 2011 © Diodes Incorporated ...

Page 2

... CTRL Parameter IN Parameter www.diodes.com AP8800A = V . CTRL REF Ratings Unit -0.3~ +0 -0.3~ 0.45 A 105 °C 300 °C -55 to +150 °C Min Max Unit 8 0.3 2.5 V 0.2 V 370 mA 0.01 1 600 kHz -40 105 °C January 2011 © Diodes Incorporated ...

Page 3

... Time taken for output current to reach 90% of final value after V = 0.3V CTRL TSOT23-5 (Note www.diodes.com AP8800A Min Typ. Max Unit 300 650 µ µA 95 100 105 mV 1.25 V 1.3 µA Ω 1.5 2.2 5 µA 250 kHz 500 µ °C/W 200 January 2011 © Diodes Incorporated ...

Page 4

... Reference Voltage vs. Ambient Temperature 2 25°C A 2.2 2 1.8 1.6 1.4 1 -40 Power Switch On-Resistance vs. Ambient Temperature www.diodes.com AP8800A T = 25° Input Voltage ( 12V IN - 110 Ambient Temperature ( ° 12V IN 110 - Ambient Temperature (°C) January 2011 © Diodes Incorporated ...

Page 5

... Change in LED Current vs. Ambient Temperature AP8800A Document number: DS35100 Rev COST EFFECTIVE 28V BUCK 1-W LED DRIVER 350 300 250 200 150 100 110 0 0 www.diodes.com AP8800A Ω 0.3 S Ω 0.56 S Ω 1 (V) CTRL Output Current vs January 2011 © Diodes Incorporated ...

Page 6

... V SET LED current Versus RSET and VCTRL 1 1.2 1 1.2 1 1.2 1.5 2 RSET value [Ohms] and V SET www.diodes.com AP8800A the SET LED current @ VCTRL = 1.25V LED current @ VCTRL = 2.5V LED current @ VCTRL = 0.625V CTRL January 2011 © Diodes Incorporated ...

Page 7

... COST EFFECTIVE 28V BUCK 1-W LED DRIVER (T = 25°C unless otherwise stated) A Switching Frequency 150 220 150 220 200 250 300 350 Inductor Value [uH www.diodes.com AP8800A 12V - 1LED 24V - 3 LEDs 28V - 4LEDs 470 470 400 450 500 January 2011 © Diodes Incorporated ...

Page 8

... This scheme uses the 50k resistor between the ADJ pin and the internal voltage reference as a pull-up resistor for the external transistor eg MMBT3904. AP8800A Document number: DS35100 Rev COST EFFECTIVE 28V BUCK 1-W LED DRIVER (T = 25°C unless otherwise stated www.diodes.com AP8800A January 2011 © Diodes Incorporated ...

Page 9

... Applications Information (Continued) Thermal Considerations The graph below in figure 4, gives details for the power derating of the AP8800AWT. This assumes the device to be mounted on a 25x25mm PCB with 1oz copper standing in still air. 450 400 350 300 250 200 150 100 50 0 -40 ...

Page 10

... X7R 1206 Generic Kemet C1206105K5RAC7800 (50v) NIC NMC1206X7R105K50F (50v) X7R 0805 Generic Kemet C0805C104K5RAC (50v) NIC NMC0805X7R104K50TRPF (50v) LPS6235 - series www.diodes.com AP8800A SUGGESTED SOURCE Diodes Inc. Diodes Inc. Kemet Kemet Kemet NIC Components Kemet NIC Components Coilcraft January 2011 © Diodes Incorporated ...

Page 11

... Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. Marking Information (1) TSOT23-5 (Top View Part Number AP8800AWT-7 Package Outline Dimensions (1) Package Type: TSOT23-5 AP8800A Document number: DS35100 Rev COST EFFECTIVE 28V BUCK 1-W LED DRIVER AP8800A AP8800A Package ...

Page 12

... Any Customer or user of this document or products described herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website, harmless against all damages. ...

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