VIPER27
Block diagram
1
Figure 2.
Block diagram
Block diagram
BR
VDD
VDD
Vcc
DRAIN
+
Vin_OK
-
VBRth
15uA
UVLO
-
SOFT
START
OCP
BLOCK
OCP
BURST
TURN-ON
LOGIC
S
Q
R1
OSCILLATOR
Internal Supply bus
&
Ref erence Voltages
SUPPLY
& UVLO
HV_ON
I DDch
THERMAL
SHUTDOWN
OTP
.
OVP
LOGIC
+
-
6uA
OVP
Ref
+
-
BURST-MODE
LOGIC
FB
2
Table 2.
Typical power
Typical power
230 V
AC
Part number
VIPER27
Adapter
(1)
18 W
Open frame
(2)
20 W
Adapter
(1)
10 W
85-265 V
AC
Open frame
(2)
12 W
1. Typical continuous power in non ventilated enclosed adapter measured at 50
°
C ambient.
2. Maximum practical continuous power in an open frame design at 50
°
C ambient, with adequate heat sinking.
Doc ID 15133 Rev 5
+
PWM
LEB
2nd OCP
LOGIC
BURST
CONT
R2
OLP
OVP
OTP
Rsense
GND
3/31
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