MP2410 – 24V, 2A, 1MHZ, SYNCHRONOUS, STEP-DOWN, LED DRIVER

PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE

MP2410 Rev. 1.0

www.MonolithicPower.com

12

8/25/2016

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Figure 2: EN/DIM Time Sequence

Analog Dimming

Apply a DC signal on EN/DIM to dim the

MP2410 in analog dimming mode. When the

LED current is regulated to the minimal scale.

When the voltage on EN/DIM is between

from the minimal scale to the full scale of the

LED current. If the voltage on EN/DIM is higher

regulated.

Figure 3 shows the analog dimming curve. Due

to the hysteretic of the EN/DIM on/off threshold,

the chip remains at the minimal LED current

same in the linear dimming range.

Figure 3: Analog Dimming Curve

Open LED

If the LED is open without a feedback signal, the

MP2410 works at the maximum duty cycle, and

the output voltage rises up close to the input

voltage. Every power component operates at a

safe state.

LED Short-Circuit Protection (SCP)

The

MP2410

integrates

LED

short-circuit

protection (SCP) circuitry. There are several

features protecting the MP2410 from damage

when an LED short circuit occurs.

The MP2410 features a cycle-by-cycle current

limit to restrict the maximum current of the

inductor. A protection mechanism monitors the

FB level though an internal R-C filter. Once the

stops switching until the FB level drops to a

lower value, and the system works in burst mode.

In the worst-case scenario, the LED is shorted to

GND. If the cycle-by-cycle current-limit function

cannot clamp the current overshoot sufficiently,

then the current through both the high-side and

low-side FETs is also monitored by over-current

detector inside the chip. If this current is higher

MP2410 treats this as a short-circuit condition.

When an over-current condition or short-circuit

condition is detected, the MP2410 turns off both

the high-side and low-side MOSFETs for 2.4ms

down to ground, so the restart from the fault

condition is also done with a soft start.

Thermal Protection

NTC provides LED thermal protection. An NTC

resistor used to monitor the ambient temperature

can be connected to NTC directly. There is an

internal current source flowing out of NTC. The

corresponding voltage is generated on the

external NTC resistor and the LED current

changes (see Figure 4).