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PAM2861 Datasheet

1A LED DRIVER

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A Product Line of
Diodes Incorporated
PAM2861
1A LED DRIVER WITH INTERNAL SWITCH
Description
The PAM2861 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 6V and 40V and
provides an externally adjustable output current of up to 1A.
Depending upon supply voltage and external components, this can
provide up to 30 watts of output power.
The PAM2861 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.
Pin Assignments
Top View
TSOT25
Features
Simple Low Parts Count
Internal 40V NDMOS Switch
1A 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: 6V to 40V
Output Shutdown
Open LED Protection
Short LED Protection
Up to 1MHz Switching Frequency
Inherent Open-Circuit LED Protection
Typical 5% Output Current Accuracy
Pb-free TSOT25 and SOT89-5 Packages
Applications
Low voltage halogen replacement LEDs
Low voltage industrial lighting
LED back-side lighting
Illuminated signs
PAM2861
Document number: DSxxxxx Rev. 1 - 1
1 of 12
www.diodes.com
July 2013
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

PAM2861 Datasheet

1A LED DRIVER

No Preview Available !

Typical Applications Circuit
A Product Line of
Diodes Incorporated
PAM2861
Pin Descriptions
Pin
Number
1
2
3
4
5
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.
PAM2861
Document number: DSxxxxx Rev. 1 - 1
2 of 12
www.diodes.com
July 2013
© Diodes Incorporated


Part Number PAM2861
Description 1A LED DRIVER
Maker Diodes
Total Page 12 Pages
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