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PDF PAM2841 Data sheet ( Hoja de datos )
| Número de pieza | PAM2841 | |
| Descripción | 40V Precision WLED Driver | |
| Fabricantes | Power Analog Micoelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PAM2841 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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PAM2841
1.5A SW Current, 40V Precision WLED Driver
Features
n Capable of Driving 10 or more WLEDs
n Chip Enable with Soft-start
n Analog and PWM Dimming
n Peak Efficiency up to 90%
n Low Quiescent Current
n Fixed Frequency of 1MHz
n Over Current Protection
n Over Voltage Protection
n Thermal Protection
n UVLO
n Tiny Pb-Free Packages (RoHS
Compliant): MSOP-8 and DFN 2X2
Applications
n WLED Driver System
Description
The PAM2841 is a white LED driver, capable of
driving 10 or more WLEDs in series (depending on
forward voltage of the LEDs) with a range of input
voltages from 2.7V to 5.5V.
The PAM2841 features over current protection, over
voltage protection, under voltage lockout and over
temperature protection, which prevent the device
from damage.
LED dimming can be done by four methods as
described in the Application Information hereinafter.
Typical Application
VIN
C1
10μF
C2
1μF
www.DataSheet4U.com
C4
10nF
L1
22μH
D1(SS14)
PGND
SW
VIN OVP
PAM2841
ENA
FB
Comp
GND
R1
910kΩ
C3
1μF
R2
27kΩ
10 LEDs
R3
10Ω
D1(SS14)
VIN L1
22μH
C1
10μF
C2
1μF
PGND
SW
VIN OVP
PAM2841
ENA
FB
R1
910kΩ
C3
1μF
R2
27kΩ
C4
10nF
Comp
GND
R3
1.1Ω
3x9 LEDs
Power Analog Microelectronics,Inc
www.poweranalog.com
1
08/2008 Rev 1.3
1 page  
PAM2841
1.5A SW Current, 40V Precision WLED Driver
Typical Operating Characteristics
TA=25°C,V =DD 5V, unless otherwise noted.
1. Efficiency VS Input Voltage
I =LED 20mA, L=22µH
90%
85%
80%
75%
70%
65%
60%
55%
50%
2
3 45
Input Voltage(V)
6LED
8LED
10LED
12LED
6
95 %
90 %
85 %
80 %
75%
70%
65%
60%
0
2. Efficiency VS Load Current
6 LED, L=22µH
10 20 30 40
Output Current(mA)
VDD=5V
VDD=3.6V
50 60
3. Efficiency VS Input Voltage
I =LED 20mA, 10 LED
0.9
0.85
ww0w.8.DataSheet4U.com
0.75
0.7
0.65
0.6
2
L=4.7uH
L=10uH
L=22uH
L=33uH
L=47uH
3 45
Input Voltage(V)
6
4. LED Current VS Output Voltage
L=47µH
0.5
VDD=5V
VDD=3V
0.4
0.3
0.2
0.1
0
8 12 16 20 24 28 32 36
Output Voltage (V)
Power Analog Microelectronics,Inc
www.poweranalog.com
5
08/2008 Rev 1.3
5 Page 
PAM2841
1.5A SW Current, 40V Precision WLED Driver
Layout Considerations
As for all switching power supplies, especially
those in high frequency and high current ones,
layout is an important design step. If layout is not
carefully done, the regulator could suffer from
instability as well as noise problems.
(1) Use separate traces for power ground and
signal ground. Power ground and signal ground
are connected together to a quite ground (input
connector)
(2) To prevent radiation of high frequency
resonance, proper layout of the high frequency
switching path is essential. Minimize the length
and area of all traces connecting to the SW pin.
The loop including the PWM switch, schottky
diode and output capacitor, contains high current
rising and falling in nanosecond and thus it
should be kept as short as possible.
(3) The input capacitor should be close to both
the VIN pin and the GND pin in order to reduce
the IC supply ripple.
(4) Keep the signal ground traces short and as
close to the IC as possible. Small signal
components should be placed as close as
possible to the IC, thus minimizing control signal
noise interference.
Layout Example
Top Layer
Bottom Layer
www.DataSheet4U.com
Power Analog Microelectronics,Inc
www.poweranalog.com
11
08/2008 Rev 1.3
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet PAM2841.PDF ] | |
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