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L6725ATR Scheda tecnica(PDF) 12 Page - STMicroelectronics

Il numero della parte L6725ATR
Spiegazioni elettronici  Voltage mode PWM controller with bootstrap anti-discharging system
PDF  32 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6725ATR Scheda tecnica(HTML) 12 Page - STMicroelectronics

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Device description
L6725 - L6725A
12/32
5.5
Error amplifier
5.6
Soft start
When both VCC and VIN are above their turn-ON thresholds (VIN is monitored by the OCH pin)
the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At start-up, a
ramp is generated charging the external capacitor CSS with an internal current generator. The
initial value for this current is 35µA and charges the capacitor up to 0.5V. After that it becomes
10µA until the final charge value of approximately 4V (see Figure 5.).
Figure 4.
Error amplifier reference
Figure 5.
Soft-Start phase.
t
t
0.5V
4V
Vcc
Vin
Vss
4.2V
1.25V



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