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CS5171 其他数据使用手册 - ON Semiconductor（安森美）
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ON Semiconductor（安森美）
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AC- DC离线开关控制器/稳压器 AC-DC Offline Switching Controllers/Regulators
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CS5171数据手册
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DN05019/D
Rev 0 - September, 2011
Figure 2: CS5171 Pinout
Table 1: Pin Description
PIN PIN NAME DESCRIPTION
1 VC
Loop compensation pin. The VC pin is the output of the error amplifier and is used for loop compensation,
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 V and 6 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 synchronization 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.
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