MP2410A

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

MP2410A Rev. 1.0

www.MonolithicPower.com

13

4/25/2016

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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).

0

Full Scale

Min Scale

Figure 4: NTC Curve

The NTC resistance value drops when the

ambient temperature rises up. If the NTC voltage

drops

below

the

switching

stops

completely, and the LED current drops to 0A, so

the LED lamp can be shut down by pulling NTC

down.

Additionally, to protect against any lethal thermal

damage, when the inner temperature exceeds

the OTP threshold, the MP2410A shuts down the

switching cycle with thermal shutdown until the

temperature drops to its lower threshold.

Thermal Shutdown

Thermal shutdown is implemented to prevent the

chip

from

operating

at

exceedingly

high

temperatures. When the silicon die temperature

is higher than 150°C, OTP shuts down the entire

chip. When the temperature is below its lower

threshold (typically 90°C), the chip restarts.