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PAM2863 Datasheet

2A LED DRIVER

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A Product Line of
Diodes Incorporated
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.
Features
Simple Low Parts Count
Internal 40V NDMOS Switch
2A Output Current
Single Pin On/Off and Brightness Control Using DC Voltage or
PWM
Soft-Start
High Efficiency (up to 97%)
Wide Input Voltage Range: 4.5V to 40V
Output Shutdown
Open LED Protection
Short LED Protection
Up to 1MHz Switching Frequency
Typical 5% Output Current Accuracy
Pb-Free SOP-8(EP) Packages
Pin Assignments
Applications
High End LED Flashlight
LED Light Bar
PAM2863
Document number: DSxxxxx Rev. 1 - 0
1 of 11
www.diodes.com
October 2012
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

PAM2863 Datasheet

2A LED DRIVER

No Preview Available !

Typical Applications Circuit
A Product Line of
Diodes Incorporated
PAM2863
Pin Descriptions
Pin
Number
5, 6
3, 7, 8
4
2
1
Pin
Name
LX
GND
VSET
ISENSE
VIN
Function
Drain of NDMOS switch.
Ground (0V)
• Multi-function On/Off and brightness control pin:
• Leave floating for normal operation.
• Drive to voltage below 0.2V to turn off output current
• Drive with DC voltage (0.3V < VSET< 2.5V) to adjust output current from 12% to 100% of IOUTnom
• Drive with PWM signal from open-collector or open-drain transistor, to adjust output
current. Adjustment range 1% to 100% of IOUTnom for f < 500Hz
• Connect a capacitor from this pin to ground to increase soft-start time. (Default soft-start time = 0.1ms.
Additional soft-start time is approx.1.5ms/1nF)
Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom = 0.1/Rs
Input voltage (6V to 40V). Decouple to ground with 10μF or higher X7R ceramic capacitor close to device.
PAM2863
Document number: DSxxxxx Rev. 1 - 0
2 of 11
www.diodes.com
October 2012
© Diodes Incorporated


Part Number PAM2863
Description 2A LED DRIVER
Maker Diodes
Total Page 11 Pages
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