MP2487 MPS, MP2487 Datasheet - Page 4

• Manufacturer Part Number: MP2487
• Description: 55v, 1a High Power Led Driver
• Manufacturer: MPS

PIN FUNCTIONS
MP2487 Rev. 0.9
1/26/2010
Pin #
1
2
3
4
5
6
7
8
Exposed pad
COMP
Name
FREQ
GND,
BST
SW
VIN
EN
FB
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Description
Switch Node. This is the output from the high-side switch. A low V
rectifier to 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.
thermal performance.
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.
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MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER
Connect exposed pad to GND plane for optimal
F
Schottky
4