NCP5173(2004) 查看數據表（PDF） - ON Semiconductor
零件编号
产品描述 (功能)
生产厂家
NCP5173 Datasheet PDF : 18 Pages
| |||
NCP5173
ELECTRICAL CHARACTERISTICS (continued) (2.7 V < VCC < 30 V; 0°C < TJ < 125°C; for all specifications unless otherwise stated.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
General
Operating Current
Shutdown Mode Current
ISW = 0
−
5.5
8.0
mA
VC < 0.8 V, SS = 0 V, 2.7 V ≤ VCC ≤ 12 V
−
12
60
mA
VC < 0.8 V, SS = 0 V, 12 V ≤ VCC ≤ 30 V
−
−
100
Minimum Operation Input Voltage
Thermal Shutdown
VSW switching, maximum ISW = 10 mA
(Note 3)
−
2.45
2.70
V
150
180
210
°C
Thermal Hysteresis
(Note 3)
3. Guaranteed by design, not 100% tested in production.
−
25
−
°C
PIN FUNCTION DESCRIPTION
Pin Number
1
Symbol
VC
Function
Loop compensation pin. The VC pin is the output of the error amplifier and is used for loop com-
pensation, current limit and soft−start. Loop compensation can be implemented by a simple RC
network as shown in the application diagram on Page 2 as R1 and C1.
2
FB
Positive regulator feedback pin. This pin senses a positive output voltage and is referenced to
1.276 V. When the voltage at this pin falls below 0.4 V, chip switching frequency reduces to 20% of
the nominal frequency.
3
Test
These pins are connected to internal test logic and should either be left floating or tied to ground.
Connection to a voltage between 2.0 V and 6.0 V shuts down the internal oscillator and leaves the
power switch running.
4
SS
Synchronization and shutdown pin. This pin may be used to synchronize the part to nearly twice
the base frequency. A TTL low will shut the part down and put it into low current mode. If synchro-
nization is not used, this pin should be either tied high or left floating for normal operation.
5
VCC
Input power supply pin. This pin supplies power to the part and should have a bypass capacitor
connected to AGND.
6
AGND
Analog ground. This pin provides a clean ground for the controller circuitry and should not be in the
path of large currents. The output voltage sensing resistors should be connected to this ground pin.
This pin is connected to the IC substrate.
7
PGND
Power ground. This pin is the ground connection for the emitter of the power switching transistor.
Connection to a good ground plane is essential.
8
VSW
High current switch pin. This pin connects internally to the collector of the power switch. The open
voltage across the power switch can be as high as 40 V. To minimize radiation, use a trace as short
as practical.
http://onsemi.com
4
Share Link: 