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TPS92411DDAR Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS92411DDAR
Description  Floating Switch for Offline AC Linear Direct Drive of LEDs with Low Ripple Current
Download  22 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS92411DDAR Fiches technique(HTML) 10 Page - Texas Instruments

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Time
49
89
129
169
209
249
000
001
010
011
100
101
110
111
289
110
101
100
011
010
001
000
46
86
126
166
206
246
286
Voltage trip points do not
include diode drops
´
=
RMS
RMS
CS
IN
120 V
2.3V
R
P
TPS92411, TPS92411P
SLUSBQ6 – OCTOBER 2013
www.ti.com
(3)
TYPICAL OPERATION (230-VAC APPLICATION)
In the 230-V application shown in Figure 11, the highest efficiency can be obtained by using a high-voltage total
LED stack to reduce losses in the linear regulator FET. The best current sharing between stacks can be
achieved by using the lowest voltage stack at the bottom and making each stack voltage above that two times
that of the stack below it (as in described in the 120-V application). In this example, very good results can be
obtained by setting the lowest stack at 40 V, the middle stack at 80 V, and adding a high-voltage cascode FET
with the top stack and using 160 V. Use the RSNS pin to set a low voltage point so that when the VS pin of the
device falls below this threshold (either from the AC line falling or a higher voltage stack switch above it turning
OFF) the TPS92411 switch turns ON and bypasses the LEDs. During the ON-time, the capacitor supplies current
to the LEDs. The RSET voltage threshold for a 230-V application is generally set to approximately 8 V to 12 V
above the LED stack voltage connected across the TPS92411. This threshold is higher than in the typical 120-V
application to allow more headroom.
230-VAC Application Stack Setting Example
Set VRSNS for all three TPS92411 devices at 6 V
Set VRSET for the bottom stack at 49 V
Set VRSET for the middle stack at 89 V
Set VRSET for the top stack at 169 V
Switching order as the rectified AC line voltage increases is shown in Table 2. Figure 9 illustrates when each
switch turns ON or OFF.
Table 2. Switching Order on Rising Edge of the Rectified 230-VAC
Waveform(1)(2)
STACK
TOP 160-V
MIDDLE 80-V
BOTTOM 40-V
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
(1)
0 denotes switch ON and LEDs bypassed and supplied by the capacitor.
(2)
1 denotes switch OFF and LEDs conducting from the line, capacitor charging up.
Figure 9. Switching Order on Rising Edge of the Rectified 230-VAC Waveform
10
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: TPS92411 TPS92411P


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