LV5029MD Datasheet, PDF (11/15 Pages) Sanyo Semicon Device – LED Driver IC for LED Lighting

LV5029MD
3. OVP (Over voltage protection)
If the voltage of VIN pin is higher than the internal reference voltage VINOVP (27V typ), switching operation is
stopped.
The stopping operation is kept until the voltage of VIN is lower than 7.3V. If the voltage of VIN pin is higher than 9V,
the switching operation is restated.
VIN
voltage
Outputstage
on
A ^OVP
B ^{OVP reset}
C ^{Operation start}
27V typ
9V typ
7.3V typ
Time
Time
off
on
4. OTP (Over temperature protection)
The over temperature protection function works when the junction temperature of IC is 165°C (typ) (A ), and the IC
switching stops. The IC starts switching operation again when the junction temperature is 135°C typ (B) or lower.
Tj
(Junction tmperature)
TSD (design target)
165°C
A
135°C
B
Outputstage
on
Time
Time
off
on
Skip frequency function
LV5029MD contains the skip frequency function for reduction of the peak value of conduction noise. This function
changes the frequency as follows.
Skip frequency function
VIN
UVLO unlocked
OUT
45k
55k
52.5k
50k
47.5k
45k
Switching frequency is changed as follows.
… ×0.9 → ×1.1 → ×1.05 → ×1 → ×0.95 → ×0.9 → ×1.1 …
It’s repeated by this loop.
No.A2132-11/15