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PDF NJW4801 Data sheet ( Hoja de datos )
| Número de pieza | NJW4801 | |
| Descripción | Small PKG Half Bridge Driver | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de NJW4801 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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NJW4801
Small PKG Half Bridge Driver
GENERAL DESCRIPTION
The NJW4801 is a general purpose, half bridge power driver
capable of supplying ±450mA current.
The internal gate driver drives high-side/low-side power
MOSFET, therefore, it has fast switching.
Additionally, it has protection features such as over current
protection and thermal shutdown. And in the case of failure, it can
output a fault flag.
It is suitable for power switching applications of DSP/micro
controller.
■ PACKAGE OUTLINE
NJW4801R
FEATURES
Output Switch Current
Operating Voltage
±450mA
8.0V to 35V
High-side and Low-side SW is available independently-function
Up to 700kHz Switching Frequency
Thermal Shut Down
Over Current Protection
Under Voltage Lockout
Fault Indicator Output
Stand-by Current
Package Outline
IQSTBY =3µA (typ.)
MSOP8 (VSP8)*
http://www.DataSheet4U.net/
* MEET JEDEC MO-187-DA
PIN CONFIGURATION
18
27
36
45
NJW4801R
1. STBY
2. IN1
3. IN2
4. FLT
5. GND
6. OUT2
7. OUT1
8. VDD
Ver.2013-04-18
-1-
datasheet pdf - http://www.DataSheet4U.net/
1 page  
NJW4801
PIN OPERATION TABLE
INPUT
IN1 IN2
LL
LH
HL
HH
OUTPUT
High-side SW
Low-side SW
(OUT1)
(OUT2)
OFF ON
OFF OFF
ON ON
ON OFF
IN1, IN2
L or H
L or H
L or H
INPUT
STBY
L
H
L
VDD
V+ ≥ VRUVLO
–
V+ < VDUVLO
INPUT
Tj IOUT
Tj >150°C
–
–
IOUT ≥ ILIMIT
FLT
OFF
OFF
OUTPUT
FLT
High-side SW
(OUT1)
Low-side SW
(OUT2)
ON
OFF or ON
OFF or ON
OFF OFF
OFF
OFF OFF
OFF
Mode
Active
Stand-by
UVLO
OUTPUT
High-side SW
(OUT1)
OFF
OFF
Low-side SW
(OUT2)
OFF
OFF
Mode
TSD
OCP
http://www.DataSheet4U.net/
Ver.2013-04-18
-5-
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
NJW4801 ApplicatioNnJMWa4n8u0a1l
FUNCTIONAL EXPLANATION
High-side, Low-side Switch
The OUT1 pin is High-side SW output. The OUT2 pin is Low-side SW output. These SW are controlled by IN1 and IN2,
so it can be operated independently.
The High-side SW turns on when IN1 pin voltage is more than
2.4V and turns off when IN1 pin voltage is less than 0.9V. The
Low-side SW turns off when IN2 pin voltage is more than 2.4V and
turns on when IN2 pin voltage is less than 0.9V.
Because IN1 and IN2 are inverse logic input, the half bridge
application with one input signal can be easily composed.
High Side
SW
ON
OFF
Low Side
SW
ON
OFF
In this case, OUT1 and OUT2 pin can be used as short-circuit.
NJW4801 has dead time to prevent the short circuit at the time of
Dead Time 50ns typ.
Fig3. Relation of SW Function and Dead Time
operation change of the high side and the low side SW. (ex. Fig3) The dead time typical value is 50ns. This can be used
for the application of the switching regulator that needs the high frequency. As for input frequency, you should make less
than 700kHz.
Over Current Protection Function
The internal over-current protection circuit monitors the flow currents of both the high-side and low-side switches. The
over-current protection circuit operates at 1.2A (typ.) and stops the both SW operation. The FLT detection signal is output
from FLT pin at the same time. The overcurrent protection operation is released after certain time (20µs (typ)), after
overcurrent protection operates. (Ex. Fig4)
If OUT pin is shorted directly to GND, a large surge current is flowing for fast current change and may exceed current
limit. Because that time big electric power consumption occurs instantaneously in NJW4801, you should design sufficient
heat dissipation.
When a load condition is inductive property, a reverse direction current flows to the high-side and low-side SW body
diode by inductive kickback. The built-in over-current protection circuithttp://www.DataSheet4U.net/ has not aimed at protection against the inductive
kickback. Therefore, an external diode should be considered usage against reverse-current regeneration according to
the kind of the application.
After OCP operates, the OCP is released after a certain time (20µs (typ.))
IN1, IN2
High
Low
ON
High Side SW
OFF
ON
Low Side SW
OFF
High Side SW ON
Current Limit OFF
*3
Tj > 150C (typ.) *3
Low Side SW ON
Current Limit OFF
*3
Fault Output High
(FLT pin Pull-Up) Low
OCP
TSD OCP
*3: When the thermal shutdown protection or the over current protection operates, both High-side and Low-side SW are turned off.
Fig4. Timing Chart of High-side/Low-side Switch at Over Current Protection Operating
(In case of IN1 and IN2 signal are same)
Ver.2013-04-18
- 11 -
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet NJW4801.PDF ] | |
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