Buck Converter with Minimum Component Count to Drive LEDs (11.3V @ 400mA)

(ACTIVE) PMP2493

Description & Features

Technical Documents

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Description

The TPS40200 controller can be used as a low-cost LED driver. With an input voltage rating of 4.5 to 52 V, it can power LED strings with regulated current and up to a 45 V drop across the string. Current is sensed across a resistor between the cathode of the string and ground and is compared against a 696 mV reference to provide regulated current. Because the driver is a buck and not a boost or flyback, an open string will not produce voltages above the input voltage and over-voltage protection is not needed. The driver can operate in either the continuous or discontinuous mode. For output voltages above 35 V the discontinuous mode is needed due to duty cycle limitation above 35 V. The circuit shown has a Pulse Width Modulator (PWM) input for dimming purposes. Targeted current can be set with jumpers.

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Parametrics
 PMP2493.2
(Output Voltage 1)
PMP2493.3
(Output Voltage 2)
PMP2493.4
(Output Voltage 3)
Vin (Min) (V)434343
Vin (Max) (V)474747
Vout (Nom) (V)1921.511.3
Iout (Max) (A).28.45.4
Output Power (W)5.329.6754.52
Isolated/Non-IsolatedIsolatedIsolatedIsolated
Input TypeDCDCDC
TopologyBuck- Non SyncBuck- Non SyncBuck- Non Sync
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Part Number Status

PMP2493:
Buck Converter with Minimum Component Count to Drive LEDs

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TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TPS40200  Wide Input Non-Synchronous Buck DC/DC Controller  Step-Down (Buck)  Sample & Buy View Design Kits & Evaluation Modules
UCC2897  Current Mode Active Clamp PWM Controller  Offline and Isolated DC/DC Controllers and Converters  Sample & Buy Not Available

Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views
PDF 1133 17 Jan 2011 15
Design files (2)
Title Abstract Type Size (KB) Date Views
PDF 20 17 Jan 2011 19
PDF 88 17 Jan 2011 21

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