NCP1072 ONSEMI [ON Semiconductor], NCP1072 Datasheet - Page 3

• Manufacturer Part Number: NCP1072
• Description: High-Voltage Switcher for Low Power Offline SMPS
• Manufacturer: ONSEMI [ON Semiconductor]

PIN FUNCTION DESCRIPTION
Pin N5
1
2
3
4
5
6
7
8
Pin Name
Drain
GND
GND
GND
V
Vcc
FB
NC
FB
CC
R
FB(up)
Jittering
V
clamp
V
FB(REF)
I
OVP
Powers the internal circuitry
OSC
Foldback
Feedback signal input
I
FBfault
I
FBskip
Drain connection
Figure 3. Simplified Internal Circuit Architecture
The IC Ground
The IC Ground
The IC Ground
−
+
Ipflag
Function
80−us
filter
Sawtooth
I
FB
SKIP = ”1” −−> shut
down some blocks to
reduce consumption
−
+
to CS setpoint
−
+
Vcc OVP
LineOK
SCP
t
SKIP
SCP
Ipflag
http://onsemi.com
S
R
Q
Q
3
OFF
This pin is connected to an external capacitor. The V
active shunt which serves as an auto−recovery over voltage
protection.
By connecting an opto−coupler to this pin, the peak current set
point is adjusted accordingly to the output power demand.
The internal drain MOSFET connection
This un−connected pin ensures adequate creepage distance
I
t
S
R
freeze
TSD
recovery
Q
Q
UVLO
Vcc
Management
Ipk(0)
Ramp
compensation
LineOK
Sawtooth
Reset SS as recovering from
SCP, TSD, Vcc OVP, or UVLO
DRV
+
+
−
−
Pin Description
Vcc
UVLO
Reset
Vdd
Dynamic
OFF UVLO
DRV
line
detection
LEB
Reset
Start
Soft
Drain
GND
CC
includes an