PT6910 Datasheet, PDF (1/4 Pages) Texas Instruments – 12 Watt 5V/3.3V Input Plus to Minus Voltage Converter

DESCRIPTION
The PT6910 is a continuous mode inductive step-down
converter, designed for driving single or multiple series
white LEDs efficiently from a voltage source higher than
the output LED voltage. The IC operates from an input
supply between 6V and 36V and provides an externally
adjustable output current of up to 1.2Amp.
The PT6910 includes the internal switch and a high-side
output current sensing circuit, which uses an external
resister to set the average output current. Also the output
current can be adjusted below the set value by using the
external ADJ pin.
The ADJ pin will accept either a DC voltage or a PWM
waveform. Depending upon the control PWM frequency,
the IC will provide either a continuous or a gated output
current with the internal PWM filter circuit.
The PT6910 provides a soft-start feature. And the
soft-start time can be increased by using an external
capacitor from the ADJ pin to ground if you need a longer
soft-start time. Anyway if you apply a voltage of 0.2V or
lower the output switch will be off and the IC go into a low
current standby state.
Preliminary
PT6910
1.2A LED Driver with Integrated Switch
FEATURES
• High Efficiency (up to 95%)
• Soft-Start (Adjustable)
• Maximum 1.2A Output Current
• Low/High Frequency PWM Dimming with Internal
PWM Filter
• Wide Input Voltage: 6V ~ 36V
• Internal Open-Circuit LED Protection
• Typical 5% Output Current Accuracy
• SOT-89-5L
APPLICATIONS
• DC/DC LED Driver
• Low Voltage Industrial LED Lighting
• Low Voltage Halogen Replacement LEDs
• Decorative LED Lighting
• LED Table Lighting
BLOCK DIAGRAM
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