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MP3301GJ-P

P1-P3P4-P6P7-P9P10-P11
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
MP3301 Rev. 1.01 www.MonolithicPower.com 4
10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin #
Name
Pin Function
1
SW
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the
power inductor and output rectifier to SW. SW can swing between GND and 36V.
2
GND
Ground. Connect exposed pad to GND plane for improved thermal performance.
3
FB
Feedback Input. Used to regulate the voltage across the current-sense resistor
between FB and GND. Connect a current-sense resistor from the bottom of the LED
string to GND. Connect the bottom of the LED string to FB. The regulation voltage is
200mV.
4
EN
ON/OFF Control and Dimming Command Input. A > 0.6V turns the part on, and < 0.4V
turns the part off. If the EN pin voltage is between 0.7V and 1.4V, V
FB
is regulated
between 0V and 200mV. To use PWM dimming, apply a 200Hz-to-1kHz square wave
signal with an amplitude >1.5V.
5
IN
Input Supply Pin. Requires local bypassing.
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
MP3301 Rev. 1.01 www.MonolithicPower.com 5
10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 3.8V, V
EN
=3.3V, 8 WLEDs in series, 20mA, unless otherwise noted.
MP3301—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS
MP3301 Rev. 1.01 www.MonolithicPower.com 6
10/28/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
OPERATION
The MP3301 uses a constant-frequency, peak-
current–mode, boost-regulator architecture to
regulate up to 10 white LEDs in series. Figure 1
shows how the MP3301 operates.
The MP3301 regulates the SW voltage through
the feedback voltage and the 1.3MHz oscillator.
At the start of each oscillator cycle, the control
circuitry turns the FET on. A stabilizing ramp
added to the output of the current sense
amplifier prevents sub-harmonic oscillations at
duty cycles >50%: The ramp output goes to the
positive input of the PWM comparator: When
this voltage equals the error amplifier output
(the amplified difference between the 200mV
reference voltage and the feedback voltage),
the power FET turns off.
When the feedback voltage starts to drop, the
output of the error amplifier increases, thus
increasing the current flowing through the
power FET. The increased FET power results in
increased power delivered to the output.
Figure 1: Functional Block Diagram
P1-P3P4-P6P7-P9P10-P11

MP3301GJ-P

Mfr. #:
Buy MP3301GJ-P
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 700mA, 36Vout,1.3MHz Boost WLED Driver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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