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Power Analog Micoelectronics

PAM2863 Datasheet Preview

PAM2863 Datasheet

2A LED Driver

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Features
nSimple low parts count
nInternal 40V NDMOS switch
n2A output current
nSingle pin on/off and brightness control
Using DC voltage or PWM
nSoft-start
nHigh efficiency (up to 97%)
nWide input voltage range: 4.5V to 40V
nOutput shutdown
nOpen LED Protection
nShort LED Protection
nUp to 1MHz switching frequency
nTypical 5% output current accuracy
nPb-free SOP-8(EP) Packages
Applications
nHigh end LED flashlight
nLED light bar
PAM2863
2A LED Driver with Internal Switch
Description
The PAM2863 is a continuous mode inductive
step-down converter, designed for driving single
or multiple series connected LEDs efficiently from
a voltage source higher than the LED voltage. The
device operates from an input supply between
4.5V and 40V and provides an externally
adjustable output current of up to 2A. Depending
upon supply voltage and external components,
this can provide up to 30 watts of output power.
The PAM2863 includes the output switch and a
high-side output current sensing circuit, which
uses an external resistor to set the nominal
average output current.
Output current can be adjusted below the set
value, by applying an external control signal to the
VSET pin.
The VSET pin will accept either a DC voltage or a
PWM waveform.
The soft-start time can be increased using an
external capacitor from the VSET pin to ground.
Applying a voltage of 0.2V or lower to the VSET
pin turns the output off and switches the device
into a low current standby state.
Typical Application
VIN(4.5V-40V)
C1
22μF
D1 SS34 3A/40V
Rs
0.05Ω
VIN ISENSE
PAM2863
VSET
GND
LX
L1
33μH
Power Analog Microelectronics,Inc
www.poweranalog.com
1
09/2010 Rev1.0




Power Analog Micoelectronics

PAM2863 Datasheet Preview

PAM2863 Datasheet

2A LED Driver

No Preview Available !

Block Diagram
VIN
PAM2863
2A LED Driver with Internal Switch
D1
RS
VIN ISENSE
L1
LX
C1
VSET
Pre-
regulator
LDO1
LDO2
1.2V
BG
EN
VSET
GM
5V
5V-Drv
Low voltage
detector
OTP
Ref
R2
-
+
-
+
Logic
&
Driver
GND
Internal
Enable
R3 I Limit
R1
Power Analog Microelectronics,Inc
www.poweranalog.com
2
09/2010 Rev1.0


Part Number PAM2863
Description 2A LED Driver
Maker Power Analog Micoelectronics
PDF Download

PAM2863 Datasheet PDF






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