TOP264-271
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins
V Package (eDIP-12)
+
+
S 12
1 V
2 X
3 C
4 F
E Package
(eSIP-7C)
VUV = IUV × RLS + VV (IV = IUV
)
)
S 11
S 10
S 9
V
OV = IOV × RLS + VV (IV = IOV
For RLS = 4 MΩ
S 8
VUV = 102.8 VDC
RLS 4 MΩ
S 7
6 D
V X C
F
S
D
VOV = 451 VDC
S
DC
Input
Voltage
DC
Input
Voltage
D
C
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
K Package (eSOP-12)
C
S
D
1 V
S 12
S 11
S 10
S 9
D
S
V
D
S
V
2 X
3 C
4 F
CONTROL
CONTROL
C
C
S 8
6 D
S 7
X
F
-
-
S
C
D
PI-4717-120307
PI-6119-061011
Figure 14. Line-Sensing for Undervoltage, Overvoltage and Line Feed-Forward.
Figure 13. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled. FREQUENCY Pin Tied to
SOURCE or CONTROL Pin.)
VUV = IUV × RLS + VV (IV = IUV
)
V
OV = IOV × RLS + VV (IV = IOV)
+
+
VUV = RLS × IUV + VV (IV = IUV
)
For RLS = 4 MΩ
4 MΩ
VUV = 102.8 VDC
For Values Shown
VUV = 103.8 VDC
VOV = 451 VDC
Sense Output Voltage
RLS
RLS
4 MΩ
ROVP
DC
Input
Voltage
DC
Input
Voltage
VROVP
40 kΩ
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
D
S
V
D
S
V
CONTROL
CONTROL
C
C
6.2 V
ROVP >3kΩ
-
-
PI-4720-120307
PI-4719-120307
Figure 15. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Hysteretic Output Overvoltage Protection.
Figure 16. Line Sensing for Undervoltage Only (Overvoltage Disabled).
+
+
For RIL = 12 kΩ
V
OV = IOV × RLS + VV (IV = IOV)
ILIMIT = 61%
4 MΩ
For Values Shown
VOV = 457.2 VDC
For RIL = 19 kΩ
ILIMIT = 37%
R
LS
DC
Input
Voltage
See Figure 37 for other
resistor values (RIL).
DC
Input
Voltage
D
S
55 kΩ
CONTROL
1N4148
C
D
V
CONTROL
C
X
RIL
S
-
-
PI-4721-120307
PI-5580-111210
Figure 17. Line-Sensing for Overvoltage Only (Undervoltage Disabled). Maximum
Duty Cycle Reduced at Low Line and Further Reduction with
Increasing Line Voltage.
Figure 18. External Set Current Limit.
13
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Rev. E 10/11
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