LV5768M 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LV5768M Datasheet PDF : 15 Pages
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Block Diagram
LV5768M
VIN 12
5V
5V REFERENCE
REGULATOR
VOLTAGE
TSD
VIN UVLO
VDD UVLO
ILIM 13
1.1V
SD
-
+
OCP Comp
SQ
R
VIN +
-
Current
+
-
SQ
SD R
Amp
DMAX = 90%
1.0V
SAW WAVE
0.5V
OSCILLATOR
fosc forcec
1/3
-
+
PWM Comp
CONTROL
Logic
6 CBOOT
7 HDRV
5 SW
5V
10 VDD
8 LDRV
SS 14
FB 1
COMP 2
0.67V
1.2V
RT 4
++ SS Amp
- Err
Amp
0.1V
+
-
0.1V
+
- FFOLD
Amp
shut down(SD)
11 GND
3
EN
Pin Function
Pin No. Pin name
1
FB
2
COMP
3
EN
4
RT
5
SW
6
CBOOT
7
HDRV
8
LDRV
9
N.C.
10
VDD
11
GND
12
VIN
13
ILIM
14
SS
Description
Error amplifier reverse input pin. By operating the converter, the voltage of this pin becomes 0.67V.
The voltage in which the output voltage is divided by an external resistance is applied to this pin. Moreover, when this pin
voltage becomes 0.1V or less after a soft start ends, the oscillatory frequency becomes 1/3.
Error amplifier output pin. Connect a phase compensation circuit between this pin and GND.
ON/OFF pin.
Oscillation frequency setting pin. Resistance is connected with this pin between GND.
Pin to connect with switching node. Upper part NchMOSFET external a source is connected with lower side NchMOSFET
external a drain.
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET.
Connect a bypath capacitor between CBOOT and SW.
An external the upper MOSFET gate drive pin.
An external the lower MOSFET gate drive pin.
No connection
Power supply pin for an external the lower MOS-FET gate drive.
Ground pin. Each reference voltage is based on the voltage of the ground pin.
Power supply pin. This pin is monitored by UVLO function. When the voltage of this pin becomes 8V or more by UVLO function,
The IC starts and the soft start function operates.
Reference current pin for current detection. The sink current of about 18.5μA flows to this pin.
When a resistance is connected between this pin and VIN outside and the voltage applied to the SW pin is lower than the
voltage of the terminal side of the resistance, the upper NchMOSFET is off by operating the current limiter comparator.
This operation is reset with respect to each PWM pulse.
Pin to connect a capacitor for soft start. A capacitor for soft start is charged by using the voltage of about 5μA.
This pin ends the soft start period by using the voltage of about 1.1V and the frequency fold back function becomes active.
No.A1988-4/15
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