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NCP1076STBT3G Datasheet(PDF) 3 Page - ON Semiconductor

Part # NCP1076STBT3G
Description  High-Voltage Switcher for Low Power Offline SMPS
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1076STBT3G Datasheet(HTML) 3 Page - ON Semiconductor

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NCP1070, NCP1071, NCP1072, NCP1075, NCP1076, NCP1077
www.onsemi.com
3
PIN FUNCTION DESCRIPTION
Pin N
5
Pin Name
Function
Pin Description
1
VCC
Powers the internal circuitry
This pin is connected to an external capacitor. The VCC includes an
active shunt which serves as an auto−recovery over voltage protection.
2
NC
3
GND
The IC Ground
4
FB
Feedback signal input
By connecting an opto−coupler to this pin, the peak current set point is
adjusted accordingly to the output power demand.
5
Drain
Drain connection
The internal drain MOSFET connection
6
This un−connected pin ensures adequate creepage distance
7
GND
The IC Ground
8
GND
The IC Ground
Vcc
Vcc
Management
UVLO
Reset
Vdd
t
Drain
Vcc
GND
S
R
Q
Q
UVLO
OSC
FB
Jittering
SKIP
I
FBskip
line
detection
t
recovery
SCP
OFF
SKIP = ”1” −−> shut
down some blocks to
reduce consumption
LEB
+
Soft
Start
Reset
+
Vclamp
80−us
filter
Vcc OVP
DRV
DRV
200 ns
to CS setpoint
Ipk(0)
Ipflag
Ipflag
I
FBfault
I
OVP
TSD
OFF UVLO
LineOK
LineOK
Reset SS as recovering from
SCP, TSD, Vcc OVP, or UVLO
S
R
Q
Q
I
FB
freeze
I
Sawtooth
Sawtooth
Ramp
compensation
Foldback
FB(up)
R
FB(REF)
V
SCP
Figure 3. Simplified Internal Circuit Architecture


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