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Power Analog Micoelectronics

PAM2841 Datasheet Preview

PAM2841 Datasheet

40V Precision WLED Driver

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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




Power Analog Micoelectronics

PAM2841 Datasheet Preview

PAM2841 Datasheet

40V Precision WLED Driver

No Preview Available !

PAM2841
1.5A SW Current, 40V Precision WLED Driver
Block Diagram
Comp
OVP VIN
200mV
Reference
+
GM
FB -
Comparator
-
PWM
+
PWM Logic
And Driver
SW
Σ
Ramp
Generator
+
CS
-
ENA
Shutdown And
Soft-start
1.0MHz
Oscillator
GND
PGND
www.DataSheet4U.com
Power Analog Microelectronics,Inc
www.poweranalog.com
2
08/2008 Rev 1.3


Part Number PAM2841
Description 40V Precision WLED Driver
Maker Power Analog Micoelectronics
Total Page 14 Pages
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