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PDF AP8800A Data sheet ( Hoja de datos )
| Número de pieza | AP8800A | |
| Descripción | COST EFFECTIVE 28V BUCK 1-W LED DRIVER | |
| Fabricantes | Diodes | |
| Logotipo |  |
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AP8800A
COST EFFECTIVE 28V BUCK 1-W LED DRIVER
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 VIN 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 switches off the output
MOSFET simplifying PWM dimming.
Pin Assignments
(Top View)
SW 1
GND 2
CTRL 3
5 VIN
4 SET
Features
• 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
• 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)
Applications
• MR16 Lamps
• General Illumination Lamps
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
AP8800A
Document number: DS35100 Rev. 3 - 2
1 of 13
www.diodes.com
August 2012
© Diodes Incorporated
1 page  
Typical Characteristics (cont.)
2
VIN = 12V
L = 100µH
RS = 0.33Ω
1
0
-1
-2
-40 -15 10 35 60 85 110
Ambient Temperature (°C)
Change in LED Current vs. Ambient Temperature
AP8800A
35 0
30 0
25 0
20 0
15 0
10 0
50
0
0
RS = 0.3Ω
RS = 0.56Ω
RS = 1Ω
0.5 1 1.5 2 2.5
VCTRL (V)
Output Current vs. VCT RL
3
AP8800A
Document number: DS35100 Rev. 3 - 2
5 of 13
www.diodes.com
August 2012
© Diodes Incorporated
5 Page 
Application Information (cont.) (@TA = +25°C, VIN = 12V, unless otherwise specified.)
Application Example
The typical application for the AP8800A is the MR16 application driving 1W rated LEDs from a 12V ac supply.
AP8800A
AP8800A Component List
Quantity
PCB Ident
1 U1
1
D1, D2, D3,
D4, D5
1 R1
1 C1
1 C2
1 C3
1 L1
Value
AP8800A
SBR1A40
0R15
330µF 20V
1µF > = 25V
100nF > = 25V
100µH
LED Driver IC
Description
Input bridge & freewheeling diode
Resistor, 0805, +/-1% <+/-300ppm
KOA SR732ATTDR150F
Electrolytic capacitor
X7R 1206 Generic
Kemet C1206105K5RAC7800 (50v)
NIC NMC1206X7R105K50F (50v)
X7R 0805 Generic
C0805C104K5RAC (50v)
NIC NMC0805X7R104K50TRPF (50v)
LPS6235 - series
Kemet
Suggested Source
Diodes Inc.
Diodes Inc.
Kemet
Kemet
Kemet
Components
Kemet
Components
Coilcraft
NIC
NIC
AP8800A
Document number: DS35100 Rev. 3 - 2
11 of 13
www.diodes.com
August 2012
© Diodes Incorporated
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP8800A.PDF ] | |
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