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PDF LV5768V Data sheet ( Hoja de datos )
| Número de pieza | LV5768V | |
| Descripción | 1-channel Step-down Switching Regulator | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Ordering number : ENA2093B
LV5768V
Bi-CMOS IC
1-channel Step-down Switching
Regulator
http://onsemi.com
Overview
The LV5768V is a 1-channel step-down switching regulator.
Function
• 1 channel step-down switching regulator controller.
• Frequency decrease function at pendent.
• Load-independent soft start circuit.
• ON/OFF function.
• Built-in pulse-by-pulse OCP circuit.
It is detected by using ON resistance of an external MOS.
• Synchronous rectification
• Current mode control
SSOP16(225mil)
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Supply voltage
VIN, SW
HDRV, CBOOT
VIN max
LDRV
Between CBOOT to SW
Between CBOOT to HDRV
Conditions
Ratings
Unit
45 V
45 V
52 V
6.0 V
6.0 V
EN, ILIM
Between VIN to ILIM
VDD
SS, FB, COMP,RT
Allowable Power dissipation
Pd max
Mounted on a specified board. *1
VIN+0.3
1.0
6.0
VDD+0.3
0.74
V
V
V
V
W
Operating temperature
Topr
-40 to +85
°C
Storage temperature
Tstg
-55 to +150
°C
*1 Specified board : 114.3mm × 76.1mm × 1.6mm, glass epoxy board.
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
ORDERING INFORMATION
See detailed ordering and shipping information on page 17 of this data sheet.
Semiconductor Components Industries, LLC, 2014
April, 2014
41514NK/60513NK 20130524-S00002 No.A2093-1/17
1 page  
Block Diagram
LV5768V
VIN 14
5V 5V REFERENCE
REGULATOR
VOLTAGE
TSD
VIN UVLO
VDD UVLO
ILIM 15
18.5uA
1.1V
SD
-
+
OCP Comp
SQ
R
VIN +
-
Current
+
- SD
SQ
R
Amp
DMAX = 90%1.0V
SAW WAVE
0.5V
OSCILLATOR
fosc forcec
1/3
+
-
SS 16
FB 1
0.67V
++
-
SS Amp
Err
COMP 2
Amp
1.2V
RT 4
0.1V
+
-
0.1V
+
- FFOLD
Comp
-
+
PWM Comp
7 CBOOT
8 HDRV
CONTROL
Logic
6 SW
5V
10 VDD
9 LDRV
shut down(SD)
11 GND
12 SUBGND
3
EN
Pin Function
Pin No. Pin name
Description
1 FB
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.
2 COMP
Error amplifier output pin. Connect a phase compensation circuit between this pin and GND.
3 EN
ON/OFF pin.
4 RT
Oscillation frequency setting pin. Resistance is connected with this pin between GND.
5 N.C.
No connection *2
6 SW
Pin to connect with switching node. Upper part NchMOSFET external a source is connected with lower side NchMOSFET
external a drain.
7
CBOOT
Bootstrap capacity connection pin. This pin becomes a GATE drive power supply of an external NchMOSFET.
Connect a bypath capacitor between CBOOT and SW.
8 HDRV
An external the upper MOSFET gate drive pin.
9 LDRV
An external the lower MOSFET gate drive pin.
10 VDD
Power supply pin for an external the lower MOS-FET gate drive.
11 GND
Ground pin. Each reference voltage is based on the voltage of the ground pin.
12 SUBGND It is connected with the GND pin of 11pin inside. *3
13 N.C.
No connection *2
14 VIN
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.
15 ILIM
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.
16 SS
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.
*2 The problem does not occur even if connected to the GND.
*3 Please short-circuit 11pin and 12pin.
No.A2093-5/17
5 Page 
LV5768V
• Part selection and set
1) Output voltage set
Output voltage (VOUT) is shown the equation (1).
VOUT
=
(1
+
R4
R3
)×VREF
=
(1
+
22kΩ
1.3kΩ
)×0.67
(typ)
[V]
Ex) To set output voltage of 12V, set resistors as follows: R3=1.3kΩ and R4=22kΩ.
(1)
2) Soft start set
Soft start capacitor (C5) is obtained by the equation (2).
C5
=
ISS×TSS
VREF
=
5µ×TSS
0.67V
[µF]
ISS: Charge current value, TSS: soft start time
Ex) To set soft start time of 15ms (approx.), set C5=0.1µF.
(2)
3) Overcurrent protector set
Overcurrent limit setting resistor (R5) is obtained by the equation (3).
R5
=
Rdson×IL
IIlim
max
=
Rdson×IL
18.5µ
max
[Ω]
(3)
IIlim: ILIM current value,
ILmax: the maximum value of coil current,
Rdson: Ron between drain and source of Q1 (upper Nch MOS FET).
Ron of ATP201 ≈ 23mΩ (when VGS=4.5V at 25°C)
Ex) To set current limit operation point to 11.3A (load current) where coil peak current value is 12A
(approx.), set R5 = 15kΩ. Set an optimum resistor taking variation of ON resistor into consideration due
to temperature change and make sure to confirm it with the user's specific board. For C6, connect a
capacitor of 1000pF to filter unwanted noise for the proper operation of current limiting.
ON resistor of FET
* Rdson of FET has its own temperature coefficient and the resistor becomes higher in proportion to the
temperature.
* To set Rdson value within the range of operating temperature, it is advisable that the user confirm the data sheet
by the FET supplier.
4) How to set oscillation frequency
Oscillation frequency Fosc is adjustable by RT resistor as
shown in the correlation chart as follows:
SW frequency setting range: 80kHz to 500kHz
500
450
400
350
300
250
200
150
100
50
0
0
FOSC -- RT
50 100 150 200 250 300 350 400 450 500
Resistance, RT - kΩ
5) Boot strap capacitor set
For boot strap capacitor C2, use capacitor 100 times larger than Ciss of power MOSFET.
No.A2093-11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet LV5768V.PDF ] | |
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