ssl2101 NXP Semiconductors, ssl2101 Datasheet - Page 9

• Manufacturer Part Number: ssl2101
• Description: Smps Ic For Dimmable Led Lighting
• Manufacturer: NXP Semiconductors

NXP Semiconductors
1.
SSL2101_1
Preliminary data sheet
R
SENSE
is the resistor between the SOURCE pin and GND
8.6 Demagnetization
8.7 Overcurrent protection
8.8 Short-winding protection
8.9 Overtemperature protection
The system operates in discontinuous conduction mode if the AUX pin is connected. As
long as the secondary stroke has not ended, the oscillator will not start a new primary
stroke. During the first t
This suppression may be necessary in applications where the transformer has a large
leakage inductance and at low output voltages.
The cycle-by-cycle peak drain current limit circuit uses the external source resistor R
to measure the current. The circuit is activated after the leading edge blanking time t
The protection circuit limits the source voltage over the R
and thus limits the primary peak current.
The short-winding protection circuit is also activated after the leading edge blanking time.
If the source voltage exceeds the short-winding protection threshold voltage
V
The short-winding protection also protects in case of a secondary diode short circuit.
Accurate temperature protection is provided in the device. When the junction temperature
exceeds the thermal shut-down temperature, the IC stops switching. During thermal
protection, the IC current is lowered to the start-up current. The IC continues normal
operation as soon as the overtemperature situation has disappeared.
Fig 7.
th(swp)SOURCE
Typical phase of drain ringing at switch-on (at N
, the IC stops switching. Only a power-on reset will restart normal operation.
phase
( )
Rev. 01 — 19 January 2009
sup(xfmr_ring)
40
20
20
40
0
0
200
seconds, demagnetization recognition is suppressed.
400
SMPS IC for dimmable LED lighting
600
f (kHz)
014aaa573
SENSE
V
o
= 80 V)
800
1
resistor to V
SSL2101
© NXP B.V. 2009. All rights reserved.
th(ocp)SOURCE
SENSE
9 of 21
leb
.
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