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W-5200ZI-GT Scheda tecnica(PDF) 7 Page - Copal Electronics

Il numero della parte W-5200ZI-GT
Spiegazioni elettronici  Low Noise Regulated
Download  11 Pages
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Produttore elettronici  COPAL [Copal Electronics]
Homepage  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-5200ZI-GT Scheda tecnica(HTML) 7 Page - Copal Electronics

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W-5200 5
7
Device Operation
The
use a switched capacitor charge pump to
boost the voltage at IN to a regulated output voltage.
Regulation is achieved by sensing the output
through an internal resistor divider (
and
modulating the charge pump output current based on the
error signal. A 2 phase non overlapping clock activates the
charge pump switches. The flying capacitor is charged from
the IN voltage on the first phase of the clock. On the second
phase of the clock it is stacked in series with the input voltage
and connected to OUT. The charging and discharging the
flying capacitor continues at a free running frequency of
typically 2 MHz.
In shutdown mode all circuitry is turned off and the
5 draw only leakage current from the VIN
supply. OUT is disconnected from IN. The SHDN pin is a
CMOS input with a threshold voltage of approximately
0.8 V. The
is in shutdown when a logic LOW is
applied to the SHDN pin. The SHDN pin is a high
impedance CMOS input. SHDN does not have an
internal pull down resistor and should not be allowed to
float and. It must always be driven with a valid logic level.
Short Circuit and Thermal Protection
The
have
short circuit current
limiting and over temperature protection. During overload
conditions, output current is limited to approximately 225
mA. At higher temperatures, or if the input voltage is high
enough to cause excessive chip self heating, the thermal
shutdown circuit shuts down the charge pump as the
junction temperature exceeds approximately 160 C. Once
the junction temperature drops back to approximately
140 C, the charge pump is enabled.
The
will cycle in and out of thermal shutdown
indefinitely
without
latch u p
or
damage
until
a
short circuit on OUT is removed.


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