VRH4052NVX 查看數據表（PDF） - AnaSem Semiconductors

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VRH4052NVX

High speed, Low dropout, ±1% High output accuracy CMOS Voltage Regulator with On/Off circuit

AnaSem Semiconductors 

High speed, Low dropout, ±1% High output accuracy with On/Off circuit CMOS Voltage Regulator

Rev. E13-01

VRH Series

DESCRIPTION OF OPERATION

General operation

In reference to following block diagram of the VRH series ;

*1)

VIN

Over-current

Protector

R1

RDIS

+

Voltage VREF _

Reference

VFEEDBACK

R2

Error Amp.

VOUT

VSS

EN

4MΩ

By the error amplifier, the reference voltage (VREF) is compared with VFEEDBACK which is divided by

feedback resistors R1 and R2. It supplies the output transistor (see note *1) to keep a stabilized output

voltage against with any fluctuation of input voltage by negative feedback system.

Note *1)

The VRH series has P-channel MOSFET which is connected to the VOUT terminal as the output

transistor. To prevent the VRH series from being damaged due to inverse current from VOUT

terminal to VIN terminal through a parasitic diode, VOUT should not be exceeded VIN+0.3V.

EN terminal (shutdown function) & CL auto-discharge

The VRH series can be shutdown through EN terminal. The P-channel MOSFET is turned off and

operation of all internal circuits stops to reduce the current consumption when the signal of EN

terminal is set to the shutdown level. In shutdown mode, the VRH series enables the electric charge at

the CL to be discharged via the auto-discharge resistance (RDIS ; 160Ω), and the VOUT terminal can be

rapidly returned to the VSS level as a result.

Output capacitor (CL)

For phase compensation, an output capacitor (CL) is required to connected between VOUT terminal and

VSS terminal as close as possible. A ceramic capacitor with capacitance value of at least 1.0µF is

recommended. Of course, the suitable capacitance value should be different by the condition of each

application. In addition, an input capacitor (CIN) with capacitance value of at least 1.0µF is also

recommended between VIN terminal and VSS terminal for stable input power.

Over current protection and short circuit protection

Built-in over current protection circuit performs circuit protection from over current as a current limiter.

When the load current reaches the limit level, the output voltage drops and output current also

decreases accordingly. A current of typ. 40mA will flow when output terminal is shorted.

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