MP2410A

– 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER

MP2410A Rev. 1.0

www.MonolithicPower.com

11

4/25/2016

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© 2016 MPS. All Rights Reserved.

OPERATION

The MP2410A is a high-frequency, synchronous,

rectified, step-down, switching mode LED driver

with a built-in, internal power MOSFET and

synchronous

rectifier

switch.

The

MP2410A

offers a very high-performance solution that

achieves up to 2A of continuous output LED

current with excellent load and line regulation

over a wide input supply range.

The

MP2410A

operates

in

a

fixed

1MHz

frequency, and uses peak current control mode

to regulate the output current. A new switching

cycle is initiated by the internal clock at the

beginning of every switching cycle.

The integrated high-side power MOSFET is

turned on, and the inductor current rises linearly

to provide energy to the load. The high-side

power MOSFET remains on until its current

reaches the value of the COMP level, which is

the output of the internal error amplifier. The

output voltage of the error amplifier depends on

the difference of the output feedback and the

internal, high-precision reference.

The high-side power switch remains off until the

next clock cycle begins. After the high-side

switch turns off, the low-side sync switch turns on,

and the inductor current flows through the low-

side switch. To prevent a shoot-through, a dead

time is implemented to prevent the high-side and

low-side FETs from turning on at the same time.

When the duty cycle of one switching period

reaches 94%, the current in the high-side power

MOSFET cannot reach the COMP-set current

value, and the high-side power MOSFET is

forced to turn off.

Under-Voltage Lockout (UVLO) and IC Start-

Up/Shutdown Procedure

Under-voltage lockout (UVLO) is implemented to

prevent the chip from operating at an insufficient

supply voltage. The MP2410A UVLO comparator

monitors the output voltage of the internal

appropriate thresholds, the chip starts up. The

reference block starts first to generate stable

reference voltages and currents. The internal

regulator is then enabled. The regulator provides

a stable supply for the remaining circuitries.

Three events can shut down the chip: EN/DIM

UVLO, and thermal shutdown. In the shutdown

procedure, the signaling path is blocked first to

prevent any fault triggering. The COMP voltage

pulled down.

Error Amplifier (EA)

The internal, low, offset error amplifier compares

the FB voltage with the internal 100mV reference

and outputs a COMP voltage, which is inside of

the chip and is used to control the high-side

MOSFET peak current and regulate the output

current.

Internal Soft Start (SS)

A soft start (SS) is implemented to prevent the

converter

output

current

from

overshooting

during start-up. When the chip starts, the internal

circuitry generates a soft-start voltage that ramps

up from 0V. The soft-start period lasts until the

voltage on the soft-start capacitor exceeds the

0.1V

reference

voltage.

At

this

point,

the

reference voltage takes over.

Floating Driver and Bootstrap Charging

The high-side, floating, power MOSFET driver is

powered by an external bootstrap capacitor. The

bootstrap

capacitor

voltage

is

regulated

internally.

During normal operation, a 5.1V

bootstrap voltage is maintained between BST

and SW.