MP24875 MPS, MP24875 Datasheet - Page 4

• Manufacturer Part Number: MP24875
• Description: 200khz, 55v Input, 1.5a High Power Led Driver
• Manufacturer: MPS

PIN FUNCTIONS
MP24875 Rev. 1.0
9/21/2010
SOIC8
Pin #
1
2
3
4
5
6
7
8
Exposed
COMP
FREQ
Name
GND,
BST
SW
pad
VIN
EN
FB
Description
Switch Node. This is the output from the high-side switch. A low V
ground is required. The rectifier must be close to the SW pins to reduce switching spikes.
Enable Input. Pulling this pin below the specified threshold shuts the chip down. Pulling it up
above the specified threshold or leaving it floating enables the chip.
Compensation. This node is the output of the GM error amplifier. Control loop frequency
compensation is applied to this pin.
Feedback. This is the input to the error amplifier. An external current sensing resistor is
connected in series with the LEDs to GND. The feedback voltage is connected to this pin and
is compared to the internal +200mV reference to set the regulation current.
Ground. It should be connected as close as possible to the output capacitor avoiding the high
current switch paths.
Switching Frequency Program Input. Connect a resistor from this pin to ground to set the
switching frequency.
Input Supply. This supplies power to all the internal control circuitry, both BS regulators and
the high-side switch. A decoupling capacitor to ground must be placed close to this pin to
minimize the switching spikes.
Bootstrap. This is the positive power supply for the internal floating high-side MOSFET driver.
Connect a bypass capacitor between this pin and SW pin.
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
Connect exposed pad to GND plane for optimal thermal performance.
© 2010 MPS. All Rights Reserved.
MP24875 – 1.5A, 200kHz, 55V HIGH-POWER LEDS DRIVER
www.MonolithicPower.com
F
Schottky rectifier to
4