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
11. Application information
A power supply with the SSL4101T consists of a power factor correction circuit followed
by a flyback converter. See Figure 14.
Capacitor CVCC buffers the IC supply voltage, which is powered via the high voltage
rectified mains during start-up and via the auxiliary winding of the flyback converter during
operation. Sense resistors RSENSE1 and RSENSE2 convert the current through the
MOSFETs S1 and S2 into a voltage at pins PFCSENSE and FBSENSE. The values of
RSENSE1 and RSENSE2 define the maximum primary peak current in MOSFETs S1 and S2.
In the example given, the LATCH pin is connected to a Negative Temperature Coefficient
(NTC) resistor. When the resistance drops below Equation 3 (typ), the protection is
activated.
V----p---r--o---t-(--L---A---T---C---H----) = 15.6 kΩ
(3)
IO(LATCH)
A capacitor CTIMEOUT is connected to the FBCTRL pin. For a 120 nF capacitor, typically
after 10 ms the time-out protection is activated. RLOOP is added so that the time-out
capacitor does not interfere with the normal regulation loop.
RS1 and RS2 are added to prevent the soft start capacitors from being charged during
normal operation due to negative voltage spikes across the sense resistors.
Resistor RAUX1 is added to protect the IC from damage during lightning events.
D1
S1
Cbus
SSL4101T
Product data sheet
CSS1
RSS1
RAUX1
RSENSE1
RS1
D2
T2
COUT
S2
12 11
8
COMPENSATION
6
9 16 13
10
RS2 RSS2
SSL4101T
CSS2
RSENSE2
7
4
1
3
2
5
RAUX2
CVCC
RLOOP
CTIMEOUT
Fig 15. Typical application diagram SSL4101T
014aaa302
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 21 April 2011
© NXP B.V. 2011. All rights reserved.
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