SSL4101T View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'SSL4101T' PDF : 29 Pages View PDF
NXP Semiconductors
SSL4101T
GreenChip III+ SMPS control IC
7.3.9 Overcurrent protection (FBSENSE pin)
The primary peak current in the transformer is measured accurately cycle-by-cycle using
the external sense resistor Rsense2. The OCP circuit limits the voltage on pin FBSENSE to
an internal level (see also Section 7.3.3). The OCP detection is suppressed during the
leading edge blanking period, tleb, to prevent false triggering caused by switch-on spikes.
tleb
OCP level
VFBSENSE
Fig 13. OCP leading edge blanking
t
014aaa022
7.3.10 Overpower protection
During the primary stroke of the flyback converter the input voltage of the flyback
converter is measured by sensing the current that is drawn from the pin FBAUX.
The current information is used to adjust the peak drain current of the flyback converter,
which is measured via pin FBSENSE. The internal compensation is such that an almost
input voltage independent maximum output power can be realized.
The OPP curve is given in Figure 14.
0.6
VFBSENSE
(V)
0.52
0.5
014aaa096
0.4
0.37
0.3
−400
−300
−360
−200
−100
0
IFBAUX (μA)
Fig 14. Overpower protection curve
7.3.11 Driver (FBDRIVER pin)
The driver circuit to the gate of the external power MOSFET has a current sourcing
capability of typically −500 mA and a current sink capability of typically 1.2 A. This permits
fast turn-on and turn-off of the power MOSFET for efficient operation.
SSL4101T
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 April 2011
© NXP B.V. 2011. All rights reserved.
17 of 29
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