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XC6210
Series
V
OUT
C
L
0.80V ~ 1.45V More than 6.8μF
1.50V ~ 1.75V More than 4.7μF
1.80V ~ 5.00V More than 1.0μF
■OPERATIONAL EXPLANATION
<Output Voltage Regulator Control>
The voltage, divided by resistors R1 & R2, which are connected to the V
OUT
pin is compared with the internal reference
voltage by the error amplifier. The P-channel MOSFET, which is connected to the V
OUT
pin, is then driven by the
subsequent output signal. The output voltage at the V
OUT
pin is controlled & stabilized by negative feedback. The
constant current limit circuit and short circuit
rotection o
erate in relation to the level of out
ut current.
Output Capacitor Corresponding Chart
<Current Limiter, Short-Circuit Protection>
The XC6210 series regulator offers a combination of current limit and short circuit protection by means of a built-in fixed
current limiter circuit and a foldback circuit. 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,
the output voltage drops further and output current decreases. When the output pin is shorted, a current of about 50mA
flows.
<CE Pin>
The IC's internal regulator circuitry can be shut down via the signal from the CE pin with the XC6210 series. In
shutdown mode, output at the V
OUT
pin will be pulled down to the V
SS
level via R1 & R2. Options are available for the
CE pin logic (See the product classification). Note that as the XC6210B types are '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 V
IN
voltage or a V
SS
voltage input at the CE pin. If this IC is used with the
correct specifications for the CE pin, the IC will operate normally. However, supply current may increase as a result of
through current in the IC's internal circuitry if a voltage other than VIN or V
SS
is applied.
<Low ESR Capacitor>
With the XC6210 series regulator, a stable output voltage is achievable even if low ESR capacitors are used, as a
phase compensation circuit is built into the regulator. In order to ensure the effectiveness of the phase
compensation, we suggest that an output capacitor (C
L
) be connected as close as possible, between the output
pin (V
OUT
) and the V
SS
pin. Please use an output capacitor (C
L
) with a capacitance, based on the chart below.
We also suggest an input capacitor (C
IN
) of 1.0μF: this should be connected between V
IN
and V
SS
in order to
stabilize input power source.
ON/OFF
Control
each circuit
Error
Amp
-
+
Current
Limit
V
IN
V
SS
V
OUT
R1
R2
Voltage
Reference
CE
