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NCP1511 Fiches technique(PDF) 2 Page - ON Semiconductor

No de pièce NCP1511
Description  Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter
Download  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1511 Fiches technique(HTML) 2 Page - ON Semiconductor

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NCP1511
http://onsemi.com
2
Figure 3. Simplified Block Diagram
+
+
+
+
+
+
FB
GNDA
CB0
CB1
SHD
ISENS
ISENS
SENFET
ILIM
ZCL
MODE SELECTION
SYNC DETECT
AND
TIMING BLOCK
SYNC DETECT
AND
TIMING BLOCK
THERMAL
SHUTDOWN
ENABLE
DETECT
SELECT
LOGIC
BANDGAP
REFERENCE
AND SOFT
START
PWM
OVP
PM
CMP
CMP
CMP
CMP
CMP
OA
Q2
Q1
DVR
DVR
COMPENSATION
RAMP
CONTROL
BLOCK
(PWM,PM)
GNDP
SYNC
LX
VCC
FB
DAMPING
SWITCHING
CONTROL
DAMPING
SWITCHING
CONTROL
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Type
Description
A1
GNDP
Power Ground
Ground Connection for the NFET Power Stage.
A2
LX
Analog Output
Connection from Power Pass Elements to the Inductor.
A3
VCC
Analog Input
Power Supply Input for Power and Analog VCC.
B1
SYNC
Analog Input
Synchronization input for the PWM converter. If a clock signal is present, the converter
uses the rising edge for the turn on. If this pin is low, the converter is in the Pulsed mode.
If this pin is high, the converter uses the internal oscillator for the PWM mode. This pin
contains an internal pull down resistor.
B2
GNDA
Analog Ground
Ground connection for the Analog Section of the IC. This is the GND for the FB, Ref,
Sync, CB, and SHD pins.
B3
FB
Analog Input
Feedback Voltage from the Output of the Power Supply.
C1
SHD
Analog Input
Enable for Switching Regulator. This Pin is Active High to enable the NCP1511. The SHD
Pin has an internal pull down resistor to force the converter off if this pin is not connected
to the external circuit.
C2
CB1
Analog Input
Selects Vout. This pin contains an internal pull up resistor.
C3
CB0
Analog Input
Selects Vout. This pin contains an internal pull down resistor.


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