SSL2101T/DB/FBCB120V,598 NXP Semiconductors, SSL2101T/DB/FBCB120V,598 Datasheet - Page 7

• Manufacturer Part Number: SSL2101T/DB/FBCB120V,598
• Description: BOARD EVAL LED DRIVER SS2101
• Manufacturer: NXP Semiconductors
• Type: DC/DC Switching Converters, Regulators & Controllersr

Specifications of SSL2101T/DB/FBCB120V,598

• Current - Output / Channel: 400 mA ~ 800 mA
• Outputs And Type: 1, Isolated
• Voltage - Output: 9 ~ 23 V
• Features: Dimmable, TRIAC Dimmable
• Voltage - Input: 120VAC
• Utilized Ic / Part: SSL2101
• Input Voltage: 120 V
• Board Size: 103 mm x 50 mm x 20 mm
• Maximum Operating Temperature: + 100 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 8.5 V to 40 V
• Product: Power Management Modules
• Dimensions: 103 mm x 50 mm x 20 mm
• For Use With/related Products: SSL2101T
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4812

NXP Semiconductors
SSL2101_4
Product data sheet
8.4 Bleeder for dimming applications
8.5 Valley switching
The SSL2101 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 pin WBLEED and
SBLEED is below the V
switched on as soon as the voltage on pin ISENSE exceeds the V
( 100 mV typically). The weak bleeder switch is switched off when the ISENSE voltage
drops below the V
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
th(low)(ISENSE)
WBLEED
ISENSE
Rev. 04 — 28 August 2009
0.25 V
th(SBLEED)
M2
0.1 V
level ( 250 mV typically). The weak bleeder switch is also
D2
S
level (52 V typically). The weak bleeder switch is
Q
R
B1
LOW V DETECT
OR
I1
20 A
SMPS IC for dimmable LED lighting
D3
SBLEED
M1
GND
014aaa571
Integrated
Figure
th(high)(ISENSE)
Figure
SSL2101
© NXP B.V. 2009. All rights reserved.
5.
6). After a time
level
7 of 22
(2)