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XC6504A4317R-G Datasheet(PDF) 8 Page - Torex Semiconductor

Part # XC6504A4317R-G
Description  0.6A Ultra Low Power Consumption Small Voltage Regulator (CL Capacitor-Less)
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Manufacturer  TOREX [Torex Semiconductor]
Direct Link  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC6504A4317R-G Datasheet(HTML) 8 Page - Torex Semiconductor

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XC6504 Series
OPERATIONAL EXPLANATION
The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The VOUT pin
is then driven by the subsequent output signal. The output voltage at the VOUT pin is controlled and stabilized by a system of
negative feedback.
XC6504 Series, Type A
<Current Limiter, Short-Circuit Protection>
The XC6504 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.
<CE Pin>
The XC6504 internal circuitry can be shutdown via the signal from the CE pin with the XC6504 series. In shutdown mode
with CE low level voltage is input, output at the VOUT pin will be pulled down to the VSS level via parallel to R1 & R2 and CL
discharge resistance (RDCHG).
If this IC is used with the correct output voltage for the CE pin, the logic is fixed and the IC will operate normally. However,
supply current may increase as a result of through current in the IC's internal circuitry when medium voltage is input. The output
voltage becomes unstable when the CE pin is opened.
<CL Auto-Discharge Function>
The XC6504 series can quickly discharge the electric charge at the output capacitor (CL), when a low signal to the CE pin,
which enables a whole IC circuit put into OFF state, is inputted via an internal switch located between the VOUT pin and the VSS
pin. In this state, the application is protected from a glitch operation caused by the electric charge at the output capacitor (CL).
Moreover, discharge time of the output capacitor (CL) is set by the CL auto-discharge resistance (RDCHG) and the output
capacitor (CL). By setting time constant of a CL auto-discharge resistance value (RDCHG) and an output capacitor value (CL) as
τ
(τ= CL x RDCHG), the output voltage after discharge via the internal switch is calculated by the following formulas. Please
also note RDCHG is depended on VIN and When VIN is high, RDCHG is low.
V = VOUT(E)×e
-t/τ or t=τlnV
OUT(E) / V
V: Output voltage after discharge
VOUT(E): Output voltage
t: Discharge time
τ
: CL x RDCHG
<Low ESR Capacitors>
The XC6504 series can provide a stable output voltage even if without CL capacitor or with a low ESR CL capacitor because of
a built-in phase compensation circuit. In case of adding a CL capacitor, we suggest that an output capacitor (CL) is connected as
close as possible to the VOUT pin and the VSS pin. When VIN stabilization is needed, please place an input capacitor (CIN) as
close as to the VIN pin and the VSS pin.


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