XC6204A592DL datasheet(12/28 Pages) TOREX

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XC6204 Series

268

■Operational Explanation

VSS

VIN

each circuit

−

＋

VOUT

ON/OFF

Control

Current

Limit

Voltage

Reference

With the XC6204 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit is built-in.

In order to ensure the effectiveness of the phase compensation, we suggest that an output capacitor (CL) is connected as close as possible to

the output pin (VOUT) and the VSS pin. Please use an output capacitor with a capacitance value of at least 1

µF. Also, please connect an input

capacitor (CIN) of 0.1

µF between the VIN pin and the VSS pin in order to ensure a stable power input.

0.01

0.1

100

IOUT(mA)

Topr=25

°C

VIN=∼10V，VOUT=1.8∼6.0V

CIN=1.0

µF（ceramic），CL=1.0µF（ceramic）

STABLE REGION

100

The XC6204 series includes a combination of a fixed current limiter circuit & a foldback circuit which aid the operations of the current limiter and

circuit protection. When the load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. As a

result of this drop in output voltage, the foldback circuit operates, output voltage drops further and output current decreases (refer to the data on

page 5). When the output pin is shorted, a current of about 60mA flows.

The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6204 series. In shutdown mode, output at the VOUT pin will

be pulled down to the VSS level via R1 & R2. The operational logic of the IC's CE pin is selectable (please refer to the selection guide on page

2). Note that as the standard XC6204B type is ' High Active/No Pull Down', operations will become unstable with the CE pin open. Although the

CE pin is equal to an inverter input with CMOS hysteresis, with either the pull-up or pull-down options, the CE pin input current will increase

when the IC is in operation.

We suggest that you use this IC with either a VIN voltage or a VSS voltage input at the CE pin. If this IC is used with the correct specifications for

the CE pin, the IC will operatenormally. However, supply current may increase as a result of through current in the IC's internal circuitry if a

voltage between 0.25V and 1.5V is input.

■Directions for use

GNotes on Use

1. Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be exceeded.

2. Where wiring impedence is high, operations may become unstable due to noise and/or phase lag depending on output current.

Please strengthen VIN and VSS wiring in particular.

3. Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible.

Output voltage control with the XC6204 series :

The voltage divided by resistors R1 & R2 is compared with the internal

reference voltage by the error amplifier.

The P-Channel MOSFET, which is connected to the VOUT pin, is then driven by

the subsequent output signal. The ouput voltage at the VOUT pin is controlled &

stabilised by a system of negative feedback.

The current limit circuit and short protect circuit operate in relation to the level

of output current. Further, the IC's internal circuitry can be shutdown via the CE

pin's signal.

03S_04XC6204 02.9.12 2:57 PM ページ 268

XC6204A592DL Datasheet(PDF) 12 Page - Torex Semiconductor

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