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NCP1030 Folha de dados(PDF) 2 Page - ON Semiconductor

Nome de Peças NCP1030
Descrição Electrónicos  Low Power PWM Controller with On?묬hip Power Switch and Startup Circuits for 48V Telecom Systems
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
Página de início  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1030 Folha de dados(HTML) 2 Page - ON Semiconductor

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NCP1030, NCP1031
http://onsemi.com
2
Figure 1. NCP1030/31 Functional Block Diagram
Thermal
Shutdown
One Shot
Pulse
IO
+
Reset
Dominant
Latch
S
R
7.5 V/10 V
10 V
6.5 V
2.5 V
LEB
Reset
Dominant
Latch
SQ
R
50 mV
+
+
+
+
2.5 V
+
Internal Bias
16 V
10 V
10 V
10 V
10 V
GND
VFB
COMP
UV
OV
Disable
3.0 V/3.5 V
+
PWM Latch
PWM Comparator
Error Amplifier
Current Limit
Comparator
VDRAIN
RSENSE
10 V
VCC
CT
I1
I2 = 3I1
Q
CT Ramp
+
+
2 k
W
4.5 V
ISTART
FUNCTIONAL PIN DESCRIPTION
Pin
Name
Function
Description
1
GND
Ground
Ground reference pin for the circuit.
2
CT
Oscillator Frequency
Selection
An external capacitor connected to this pin sets the oscillator frequency up to 1 MHz.
The oscillator can be synchronized to a higher frequency by charging or discharging
CT to trip the internal 3.0 V/3.5 V comparator. If a fault condition exists, the power
switch is disabled and the frequency is reduced by a factor of 7.
3
VFB
Feedback Input
The regulated voltage is scaled down to 2.5 V by means of a resistor divider.
Regulation is achieved by comparing the scaled voltage to an internal 2.5 V reference.
4
COMP
Error Amplifier Compensation
Requires external compensation network between COMP and VFB pins. This pin is
effectively grounded if faults are present.
5
OV
Line Overvoltage Shutdown
Line voltage (Vin) is scaled down using an external resistor divider such that the OV
voltage reaches 2.5 V when line voltage reaches its maximum operating voltage.
6
UV
Line Undervoltage Shutdown
Line voltage is scaled down using an external resistor divider such that the UV
voltage reaches 2.5 V when line voltage reaches its minimum operating voltage.
7
VCC
Supply Voltage
This pin is connected to an external capacitor for energy storage. During Turn−On, the
startup circuit sources current to charge the capacitor connected to this pin. When the
supply voltage reaches VCC(on), the startup circuit turns OFF and the power switch is
enabled if no faults are present. An external winding is used to supply power after
initial startup to reduce power dissipation. VCC should not exceed 16 V.
8
VDRAIN
Power Switch and
Startup Circuits
This pin directly connects the Power Switch and Startup Circuits to one of the
transformer windings. The internal High Voltage Power Switch Circuit is connected
between this pin and ground. VDRAIN should not exceed 200 V.


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