pip250m NXP Semiconductors, pip250m Datasheet - Page 7

• Manufacturer Part Number: pip250m
• Description: Pip250m Integrated Buck Converter
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 10904
Product data
7.2.6 Undervoltage and overvoltage protection
With reference to
undervoltage comparators, labelled OVP and UVP respectively. In normal operation,
the voltage on FB is regulated at 0.8 V.
If the voltage on FB exceeds the overvoltage protection (OVP) threshold (1 V) for
longer than 30 s, an overvoltage condition is detected, the gate drive signals to the
MOSFETs are disabled, and the PIP250M latches off. To reset the latch, the
PIP250M must be powered down by reducing V
threshold and then increasing V
If the voltage on FB drops below the undervoltage protection (UVP) threshold (0.5 V)
for longer than 30 s, then an undervoltage condition is detected and the gate drive
signals to the MOSFET drivers are turned off. If three undervoltage pulses are
detected then the PIP250M latches off. To reset the PIP250M, the supply voltage
(V
back up to 5 V.
Fig 5. Overcurrent trip level as a function of R
DDC
) must be reduced below the power down reset threshold and then increased
Rev. 02 — 21 February 2003
Figure
I TRIP
(A)
30
20
10
1, the FB pin is connected internally to the overvoltage and
0
1
DDC
back up to 5 V.
2
OCSET
DDC
3
below the power down reset
R OCSET (k )
.
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Integrated buck converter
03ak48
4
PIP250M
7 of 19