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PDF AP8807 Data sheet ( Hoja de datos )
| Número de pieza | AP8807 | |
| Descripción | White LED Step-up Converter | |
| Fabricantes | Anwell Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP8807 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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AP8807 Series
Anwell Semiconductor Corp.
White LED Step-up Converter
Features
General Description
l Matched LED Current with Overvoltage
Protection
l Drives up to 4 LEDs in series
l Up to 85% Efficiency
l Over 80mA Output Current Capacity
l Low 400mV Feedback Reference,
l Internal Current Limit 400mA
l Under Voltage Lock Out Circuits
l 0.1μA Low Shutdown Supply Current
l SOT-23-6 Packages
l RoHS Compliant and 100% Lead (Pb)-Free
and Green (Halogen Free with Commercial
Standard)
Applications
The AP8807 is step-up DC/DC converter that
drives white LED with a constant current. The
device can driver up to 4 series white LEDs from a
single-cell Li-Ion battery. Series connection of the
LEDs provides constant LED current that results in
uniform brightness.
The AP8807 features a minimum off-time current
-limited PFM control scheme, which combines the
advantages of PWM (higher output power and
efficiency) and those of traditional PFM (low quies-
cent current). The LED current is set with an exter-
nal sense resistor (RS) and is regulated by the
feedback pin (FB) that regulates the voltage
across the sense resistor to 400mV (Typ). The low
400mV feedback reference voltage reduces power
loss and improves efficiency for white LED driver
applications.
Output overvoltage protection (OVP) is integrated
to prevent damage in case of output open circuit
condition (e.g. faulty LED). The OVP pin can
monitor the output voltage and turn off the
converter in the event of overvoltage condition.
The AP8807 is avail- able in SOT-23-6 packages.
l Cellular Phone
l PDA, Packet PC, Smart Phone
l Handheld Computers and Devices
l Digital Still and Video Camera
l Small LCD Display
Typical Application Circuit
All reserved by AnSC © 2008
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V1.0-2008/2/13
1 page  
AP8807 Series
Function Block Diagram
Anwell Semiconductor Corp.
Typical Application Circuit
VIN
2.5V~5.5V
L1
22uH
D1
CIN
1uF
ON
OFF
6
VIN
1
SW
5
OVP
AP8807-APV
4 CE
GND
2
FB 3
COUT
4.7uF
Dimming
Control
0V~2V
R2
100K
R1
25K
ILED=15mA
Rs
33.3 Ohm
Figure 3. White LED application with DC voltage dimming control
All reserved by AnSC © 2008
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V1.0-2008/2/13
5 Page 
AP8807 Series
Anwell Semiconductor Corp.
Typical Operating Characteristics
(VIN=+3.0V,Load=4 LEDs, L=22μH, CIN=1μF, COUT=4.7μF, TA=+25°C, unless otherwise noted.)
AP8807-A Output Voltage vs Input Voltage,
Vout=18V Iout=1mA
20
15
10
5
0
0 1 23 4
Input voltage(V)
5
AP8807-A Input Current vs Input Voltage,
Load=4 LED ILED=15mA
300
250
200
150
100
50
0
2.4 2.8 3.2 3.6 4 4.4 4.8
Input voltage(V)
300
250
200
150
100
50
0
-40
Switching Frequency vs Temperature
-20 0 20 40 60 80
Temperature (oC)
100
800
700
600
500
400
300
200
100
0
2.4
AP8807-A No Load Input Current vs Input
Voltage,
Vout=18V
2.8 3.2 3.6
4
Input voltage(V)
4.4 4.8
40.00
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
2.4
Sw itch Off Quiescent Current vs
Input Voltage and Temperature
(-40)℃
25℃
3.0 3.6 4.2 4.8 5.4
Input Voltage (V)
85℃
6.0
AP8807-A Feedback Voltage vs Temperature
0.4
0.398
0.396
0.394
0.392
0.39
0.388
0.386
0.384
0.382
0.38
-50
-25
0 25 50
Temperature(oC)
75 100
All reserved by AnSC © 2008
Page: 11/15
V1.0-2008/2/13
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet AP8807.PDF ] | |
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