TOP270KG-TL Datasheet, PDF (14/40 Pages) Power Integrations, Inc. – Integrated Off-Line Switcher with EcoSmart Technology for Highly Efficient Power Supplies

TOP264-271
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins (cont.)
+
I_LIMIT = 100% @ 100 VDC
+
I_LIMIT = 53% @ 300 VDC
R_LS 2.5 MΩ
Q_R can be an optocoupler
output or can be replaced by
a manual switch.
DC
Input
Voltage
-
D
CONTROL
C
S
X
R_IL
6 kΩ
Figure 19. Current Limit Reduction with Line Voltage.
PI-5465-061009
DC
Input
Voltage
D
CONTROL
C
S
X
-
Q_R
ON/OFF
47 KΩ
PI-5466-061009
Figure 20. Active-On (Fail Safe) Remote-ON/OFF, and Latch Reset.
+
DC
Input
Voltage
Q_R can be an optocoupler
output or can be replaced
by a manual switch.
D
CONTROL
C
For R_IL = 12 kΩ
I_LIMIT = 61%
For R_IL = 19 kΩ
I_LIMIT = 37%
S
X
-
R_{IL QR}
ON/OFF
16 kΩ
PI-5531-072309
Figure 21. Active-On Remote-ON/OFF with Externally Set Current Limit,
and Latch Reset
+
DC
Input
Voltage
-
V_UV = I_UV × R_LS + V_V (I_V = I_UV)
V_OV = I_OV × R_LS + V_V (I_V = I_oV)
R_LS
4 MΩ
DC_MAX@100 VDC = 76%
DC_MAX@375 VDC = 41%
Q_R can be an optocoupler
D
V
output or can be replaced
by a manual switch.
CONTROL
C
For R_IL = 12 kΩ
I_LIMIT = 61%
S
X
R_{IL QR}
ON/OFF
16 kΩ
PI-5467-061009
Figure 22. Active-On Remote-ON/OFF with Line-Sense and External
Current Limit, and Latch Reset.
+
DC
Input
Voltage
-
V_UV = I_UV x R_LS + V_V (I_V = I_UV)
V_OV = I_OV x R_LS + V_V (I_V = I_oV)
R_LS
4 MΩ ^{For RLS = 4 MΩ}
V_UV = 102.8 VDC
V_OV = 451 VDC
D
V
DC_MAX @ 100 VDC = 76%
DC_MAX @ 375 VDC = 41%
CONTROL
C
S
X
For R_IL = 12 kΩ
I_LIMIT = 61%
R_IL
12 kΩ
See Figure 37 for
other resistor values
(R_IL) to select different
I_LIMIT values.
Figure 23. Line Sensing and Externally Set Current Limit.
+
DC
Input
Voltage
-
Typ. 65 VAC brownout threshold.
<3 s AC latch reset time.
Higher gain Q_R allows increasing R1/
decreasing C1 for lower no-load input
power.
D
CONTROL
C
S
X
R_{IL QR}
R1
4 MΩ ^1N4007
R2
39 kΩ
AC
C1 ^Input
47 nF
PI-5652-110609
Figure 24. Externally Set Current Limit, Fast AC Latch Reset and Brown-Out.
14
Rev. E 08/12
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