VIPER27LDTR STMicroelectronics, VIPER27LDTR Datasheet - Page 22
VIPER27LDTR
Manufacturer Part Number
VIPER27LDTR
Description
IC OFFLINE CONV PWM OVP OCP 16SO
Manufacturer
STMicroelectronics
Series
VIPer™ plusr
Datasheet
1.VIPER27LD.pdf
(31 pages)
Specifications of VIPER27LDTR
Output Isolation
Isolated
Frequency Range
54 ~ 66kHz
Voltage - Input
8.5 ~ 23.5 V
Voltage - Output
800V
Power (watts)
24W
Operating Temperature
-40°C ~ 150°C
Package / Case
16-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
497-10069-2
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
VIPER27LDTR
Manufacturer:
ST
Quantity:
20 000
Operation descriptions
22/31
Equation 7
Equation 8
The R
The C
The
considered instead of C
satisfy, in all case, the loop stability and the enough OLP delay time alike.
Figure 28. FB pin configuration
Figure 29. FB pin configuration
Equation 5
FB(DYN)
FB1
capacitor fixes the OLP delay and usually C
is the dynamic resistance seen by the FB pin.
can be still used to calculate the OLP delay time but C
Rfb1
Cfb1
FB
. Using the alternative compensation network, the designer can
Cfb
f
f
PFB
PFB
Cfb
Doc ID 15133 Rev 5
1
=
=
2
2
⋅
⋅
⋅ π
⋅ π
CONTROL
PWM
R
C
C
FB
FB
FB
CONTROL
REFERENCES
BURST-MODE
PWM
1
(
DYN
⋅
⋅
REFERENCES
(
(
BURST-MODE
R
R
1
FB
)
FB
+
1
(
DYN
4.8V
R
+
FB
R
FB1
4.8V
)
FB
OLP comparator
1
⋅
R
(
DYN
BURST-MODE
results much higher than C
PWM
From sense FET
+
+
OLP comparator
-
-
FB
LOGIC
1
)
BURST-MODE
PWM
)
)
From sense FET
+
+
-
-
LOGIC
To disable logic
To PWM Logic
To disable logic
BURST
FB1
To PWM Logic
BURST
has to be
VIPER27
FB
.