TOP268(2010) Ver la hoja de datos (PDF) - Power Integrations, Inc
Número de pieza
componentes Descripción
Fabricante
TOP268
(Rev.:2010)
(Rev.:2010)
Power Integrations, Inc
TOP268 Datasheet PDF : 36 Pages
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TOP264-271
Typical Uses of VOLTAGE MONITOR (V) and EXTERNAL CURRENT LIMIT (X) Pins
+
DC
Input
Voltage
V Package
(eDIP-12)
E Package
(eSIP-7C)
S 12
S 11
S 10
S9
S8
S7
1V
2X
3C
4F
5 NC
6D
VXC FS D
S
D
V
DC
C SD
CONTROL
C
-
S
XF
PI-5562-082809
Figure 12. Three Terminal Operation (VOLTAGE MONITOR and EXTERNAL
CURRENT LIMIT Features Disabled. FREQUENCY Pin Tied to
SOURCE or CONTROL Pin.)
+
DC
Input
Voltage
VUV = IUV × RLS + VV (IV = IUV)
VOV = IOV × RLS + VV (IV = IOV)
For RLS = 4 MΩ
RLS 4 MΩ
VUV = 102.8 VDC
VOV = 451 VDC
DCMAX@100 VDC = 76%
DCMAX@375 VDC = 41%
D
V
CONTROL
C
-
S
PI-4717-120307
Figure 13. Line-Sensing for Undervoltage, Overvoltage and Line Feed-Forward.
+
DC
Input
Voltage
VUV = IUV × RLS + VV (IV = IUV)
VOV = IOV × RLS + VV (IV = IOV)
For RLS = 4 MΩ
VUV = 102.8 VDC
VOV = 451 VDC
RLS 4 MΩ
Sense Output Voltage
VROVP
ROVP
DCMAX @ 100 VDC = 76%
DCMAX @ 375 VDC = 41%
D
V
CONTROL
C
ROVP >3kΩ
-
S
PI-4719-120307
Figure 14. Line-Sensing for Undervoltage, Overvoltage, Line Feed-Forward and
Hysteretic Output Overvoltage Protection.
+
DC
Input
Voltage
6.2 V
4 MΩ
VUV = RLS × IUV + VV (IV = IUV)
For Values Shown
VUV = 103.8 VDC
RLS
40 kΩ
D
V
CONTROL
C
-
S
PI-4720-120307
Figure 15. Line Sensing for Undervoltage Only (Overvoltage Disabled).
+
DC
Input
Voltage
RLS
VOV = IOV × RLS + VV (IV = IOV)
4 MΩ
For Values Shown
VOV = 457.2 VDC
55 kΩ
D
V
CONTROL
C
1N4148
-
S
PI-4721-120307
Figure 16. Line-Sensing for Overvoltage Only (Undervoltage Disabled). Maximum
Duty Cycle Reduced at Low Line and Further Reduction with
Increasing Line Voltage.
+
DC
Input
Voltage
For RIL = 12 kΩ
ILIMIT = 61%
For RIL = 19 kΩ
ILIMIT = 37%
See Figure 35 for other
D
resistor values (RIL).
CONTROL
C
S
X
RIL
-
Figure 17. External Set Current Limit.
PI-5580-012210
www.powerint.com
13
Rev. B 03/10
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