MP4034GS datasheet(12/19 Pages) MPS

12 / 19 page

MP4034 – OFFLINE LED DRIVER

MP4034 Rev. 1.02

www.MonolithicPower.com

12/4/2013

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voltage. When VCC drops to UVLO, the MP4034

will restart.

N-1

Figure 8: LED String

Assume the forward voltage of one LED is VF

and the total number of LEDs on the string is N.

So the output voltage can be calculated as

N×VF. To ensure that OVP won’t trigger during

normal operation; the VFB should not exceed

VFBOVP1 (typical 4.0V). However, avoid a large

output voltage when OVP occurs. So the

voltage reflected on the FB pin should be:

P_ AU

DOWN

FBOVP1

SDOWN

(N V

V ) 0.85V

=×

Open-Circuit Protection (OCkP)

The

MP4034

has

open-circuit

protection

(OCkP). If the −0.15V falling edge of VFB can

not be monitored—which means the feedback

loop is open—the MP4034 immediately shuts

off the driving signals and enters hiccup mode.

The MP4034 resumes normal operation when

the fault has been removed.

Thermal Shutdown (TSD)

When the temperature of the IC exceeds 150°C,

the over-temperature protection is enacted and

the IC enters auto-recovery mode. When the

temperature falls below 120°C, the IC resumes

working.

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