SSL2102T/DB/FLYB120V,598 NXP Semiconductors, SSL2102T/DB/FLYB120V,598 Datasheet - Page 7

• Manufacturer Part Number: SSL2102T/DB/FLYB120V,598
• Description: KIT SSL2102 DESIGNER 120V
• Manufacturer: NXP Semiconductors

Specifications of SSL2102T/DB/FLYB120V,598

• Current - Output / Channel: 400mA ~ 1.05A
• Outputs And Type: 1, Isolated
• Voltage - Output: 9 ~ 23 V
• Features: Dimmable
• Voltage - Input: 85 ~ 276VAC
• Utilized Ic / Part: SSL2102
• Duty Cycle (max): 75 %
• Mounting Style: SMD/SMT
• Switching Frequency: 100 KHz
• Operating Supply Voltage: 8.5 V to 40 V
• Supply Current: 1.7 A
• Maximum Operating Temperature: + 100 C
• Minimum Operating Temperature: - 40 C
• Output Power: 1.6 W
• Package / Case: SOIC-20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4931

NXP Semiconductors
SSL2102_1
Product data sheet
8.4 Bleeder for dimming applications
8.5 Valley switching
The SSL2102 IC contains some circuitry intended for mains dimmer compatibility. This
circuit contains two current sinks that are called bleeders. A strong bleeder is used for
zero-cross reset of the dimmer and TRIAC latching. A weak bleeder is added to maintain
the hold current through the dimmer.
The strong bleeder switch is switched on when the maximum voltage on the WBLEED pin
and the SBLEED pin is below the V
switch is switched on as soon as the voltage on pin ISENSE exceeds the V
level ( 100 mV typically). The weak bleeder switch is switched off when the ISENSE
voltage drops below the V
is also switched off when the strong bleeder switch is switched on. See
A new cycle is started when the primary switch is switched on (see
determined by the oscillator voltage, RC and the internal regulation level, the switch is
turned off and the secondary stroke starts. The internal regulation level is determined by
the voltage on pin PWMLIMIT.
After the secondary stroke, the drain voltage shows an oscillation with a frequency of
approximately:
where:
---------------------------------------------- -
2
Fig 5.
L
C
p
p
= primary self inductance
= parasitic capacitance on drain node
1
Bleeder circuit
L
p
C
p
WBLEED
ISENSE
0.25 V
Rev. 01 — 29 June 2009
M2
0.1 V
th(low)(ISENSE)
D2
S
Q
R
th(SBLEED)
level ( 250 mV typically). The weak bleeder switch
B1
LOW V DETECT
OR
I1
level (52 V typically). The weak bleeder
20 A
SMPS IC for dimmable LED lighting
D3
SBLEED
M1
GND
014aaa571
Integrated
Figure
SSL2102
© NXP B.V. 2009. All rights reserved.
Figure
6). After a time
th(high)(ISENSE)
5.
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