TOP252EG データシートの表示（PDF） - Power Integrations, Inc
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TOP252EG Datasheet PDF : 50 Pages
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TOP252-262
Typical Uses of MULTI-FUNCTION (M) Pin (cont.)
+
DC
Input
Voltage
VUV = IUV × RLS + VM (IM = IUV)
VOV = IOV × RLS + VM (IM = IOV)
For RLS = 4 MΩ
RLS 4 MΩ
VUV = 102.8 VDC
VOV = 451 VDC
Sense Output Voltage
DCMAX @ 100 VDC = 76%
D
M
DCMAX @ 375 VDC = 41%
CONTROL
C
-
S
PI-4729-120307
Figure 31. Line Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Latched Output Overvoltage Protection.
+
DC
Input
Voltage
VUV = IUV × RLS + VM (IM = IUV)
VOV = IOV × RLS + VM (IM = IOV)
For RLS = 4 MΩ
VUV = 102.8 VDC
VOV = 451 VDC
RLS 4 MΩ
Sense Output Voltage
VROVP
ROVP
D
M
DCMAX @ 100 VDC = 76%
CONTROL DCMAX @ 375 VDC = 41%
C
ROVP >3kΩ
-
S
PI-4730-120307
Figure 32. Line Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Hysteretic Output Overvoltage Protection.
+
DC
Input
Voltage
6.2 V
4 MΩ
VUV = RLS × IUV + VM (IM = IUV)
For Values Shown
VUV = 103.8 VDC
RLS
40 kΩ
D
M
CONTROL
C
-
S
PI-4731-120307
Figure 33. Line Sensing for Undervoltage Only (Overvoltage Disabled).
+
DC
Input
Voltage
4 MΩ
RLS
VOV = IOV × RLS + VM (IM = IOV)
For Values Shown
VOV = 457.2 VDC
55 kΩ
1N4148
D
M
CONTROL
C
-
S
PI-4732-120307
Figure 34. Line Sensing for Overvoltage Only (Undervoltage Disabled). Maximum
Duty Cycle Reduced at Low Line and Further Reduction with
Increasing Line Voltage.
+
DC
Input
Voltage
RIL
For RIL = 12 kΩ
ILIMIT = 61%
For RIL = 19 kΩ
ILIMIT = 37%
See Figures 55b for other
resistor values (RIL) to
select different ILIMIT values.
D
M
CONTROL
C
-
S
PI-4733-021308
Figure 35. Externally Set Current Limit (Not Normally Required – See M Pin
Operation Description).
+
RLS 2.5 MΩ
ILIMIT = 100% @ 100 VDC
ILIMIT = 53% @ 300 VDC
DC
Input
Voltage
RIL 6 kΩ
D
M
CONTROL
C
-
S
PI-4734-092107
Figure 36. Current Limit Reduction with Line Voltage (Not Normally Required –
See M Pin Operation Description).
www.powerint.com
19
Rev. H 06/13
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