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NCP1508 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1508
Description  Up to 500 mA, 1 MHz, High Efficiency Synchronous Step−Down DC−DC Converter in DFN Package
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1508 Datasheet(HTML) 2 Page - ON Semiconductor

 
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NCP1508
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
VCCA
VCCP
FB
DAMPING
SWITCHING
CONTROL
DAMPING
SWITCHING
CONTROL
2
10
6
3
4
5
6
1
7
8
9
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Type
Description
1
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.
2
GNDP
Power Ground
Ground Connection for the N−FET Power Stage.
3
LX
Analog Output
Connection from Power Pass Elements to the Inductor.
4
VCCP
Analog Input
Power Supply Input for the Switching P−FET.
5
VCC
Analog Input
Power Supply Input for Power and Analog VCC.
6
FB
Analog Input
Feedback Voltage from the Output of the Power Supply.
7
CB0
Analog Input
Selects Vout. This pin contains an internal pulldown resistor.
8
CB1
Analog Input
Selects Vout. This pin contains an internal pullup resistor.
9
SHD
Analog Input
Enable for Switching Regulator. This pin is Active High to enable the NCP1508.
The SHD Pin has an internal pulldown resistor to force the converter off if this pin
is not connected to the external circuit.
10
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 pulldown resistor.


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