VLCF4020-6R8 ONSEMI [ON Semiconductor], VLCF4020-6R8 Datasheet - Page 2

• Manufacturer Part Number: VLCF4020-6R8
• Description: Up to 500 mA, High Efficiency Synchronous Step-Down DC-DC Converter
• Manufacturer: ONSEMI [ON Semiconductor]

PIN FUNCTION DESCRIPTION
GNDA
Pin No.
SHD
CB0
CB1
FB
A1
A2
A3
B1
B2
B3
C1
C2
C3
Symbol
GNDP
GNDA
SYNC
SHD
CB1
CB0
V
LX
FB
REFERENCE
CC
COMPENSATION
AND SOFT
BANDGAP
DETECT
SELECT
ENABLE
LOGIC
START
RAMP
Analog Ground
Power Ground
Analog Output
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Analog Input
Type
SHUTDOWN
THERMAL
−
+
−
CMP
+
−
CMP
+
OA
Figure 3. Simplified Block Diagram
Ground Connection for the NFET Power Stage.
Connection from Power Pass Elements to the Inductor.
Power Supply Input for Power and Analog V
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.
Ground connection for the Analog Section of the IC. This is the GND for the FB, Ref,
Sync, CB, and SHD pins.
Feedback Voltage from the Output of the Power Supply.
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.
Selects V
Selects V
PWM
OVP
PM
http://onsemi.com
CMP
+
out
out
−
ISENS
. This pin contains an internal pull up resistor.
. This pin contains an internal pull down resistor.
NCP1511
2
CONTROL
(PWM,PM)
BLOCK
MODE SELECTION
ILIM
CMP
+
−
SENFET
Description
CC
.
ZCL
SYNC DETECT
SYNC DETECT
TIMING BLOCK
TIMING BLOCK
SWITCHING
SWITCHING
DVR
CONTROL
CONTROL
DAMPING
DAMPING
AND
AND
CMP
DVR
ISENS
−
+
Q1
Q2
VCC
GNDP
SYNC
FB
LX