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PDF NJW4814 Data sheet ( Hoja de datos )
| Número de pieza | NJW4814 | |
| Descripción | Dual H-Bridge Driver | |
| Fabricantes | New Japan Radio | |
| Logotipo |  |
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NJW4814
Dual H-Bridge Driver with Boost Converter
GENERAL DESCRIPTION
The NJW4814 is a dual H-bridge driver with boost converter IC.
It can boost the output voltage from Li-ion battery and/or a 5V power
supply and drives a piezo device by two H- bridge drivers.
48ms of internal fixed soft start function of the boost circuit sets a limit
to startup current.
The dual H-bridge drivers have independent signal inputs and a fault
output function, therefore the NJW4814 improves controllability from a
microcomputer.
The input frequency of H-bridge driver is up to 300kHz.
■ PACKAGE OUTLINE
NJW4814MLE
FEATURES
Boost Converter Block
H-Bridge Driver Block
Under Voltage Lockout
Built-in Thermal Shutdown
Standby Function
Package Outline
Output Switch Voltage
Switching Current
PWM Control
Operating Voltage Range
Oscillation Frequency Range
Soft Start Function
Over Current Protection
Over Voltage Protection
40V max.
1.5A min.
2.7 to 5.5V
380k to 1MHz
48ms typ.
Internal 2 Channel H-Bridge
Each Channel Operates Individually
Over Current Protection
Operating Voltage Range
Switching Frequency
Output Shut Down Control
Fault Indicator Output
300mA typ.
7.0 to 35V
300kHz max.
NJW4814MLE : EQFN24-LE
Ver.2015-04-07
-1-
1 page  
NJW4814
ELECTRICAL CHARACTERISTICS
Boost Converter Block
PARAMETER
SYMBOL
(Unless otherwise noted, VDD_SW=VSTBYb=3.7V, RT=100k , Ta=25 C)
TEST CONDITION
MIN.
TYP.
MAX. UNIT
Under Voltage Lockout Block
UVLO Release Voltage
UVLO Operate Voltage
UVLO Hysteresis Voltage
Soft Start Block
Soft Start Time
VRUVLO_SW
VDUVLO_SW
VUVLO_SW
VRUVLO_SW - VDUVLO_SW
TSS VB=0.95V
Oscillator Block
Oscillation Frequency
Oscillation Frequency
deviation (Supply voltage)
Oscillation Frequency
deviation (Temperature)
fOSC RT=100k
fDV VDD_SW=3.0V to 5.5V
fDT Ta= -40 C to +85 C
Error Amplifier Block
Reference Voltage
Input Bias Current
IN- pin Clamp Voltage
RADJ pin
FET ON Resistance
RADJ pin
FET Leak Current
VB
IB
VCLIN-
RON_RADJ
Short IN- and FB,
Measuring IN- Pin
VB=1.0V
VSTBYb=0V, VDD_SW=5.5V,
ICLIN-=10 A
IRADJ=10mA
ILEAK_RADJ VSTBYb=0V, VRADJ=3.3V
PWM Comparate Block
Maximum Duty Cycle
Output Block
Switching FET
ON Resistance
Switching Current Limit
Switching FET Leak Current
Overvoltage Protection Block
OVP Operate Voltage
OVP Release Voltage
OVP Hysteresis Voltage
OVP pin Input Current 1
OVP pin Input Current 2
OVP pin Leak Current
MAXDUTY VIN-=0.9V
RON_SW
ILMT_SW
ILEAK_SW
ISW=100mA
VSTBYb=0V, VSW=40V
VDOVP
VROVP
ΔVOVP
IOVP1
IOVP2
IOVP_LEAK
VDOVP -VROVP
VOVP= VDD_HB=35V,
OVP Release
VOVP= VDD_HB=40V,
OVP Operate
VSTBYb=0V,
VOVP= VDD_HB=40V
2.1 2.4 2.7 V
2.0 2.2 2.5 V
– 0.2 – V
34 48 60 ms
630 700 770 kHz
– 1 –%
– 3 –%
-1.0% 1.00 +1.0% V
-0.1 – +0.1 A
4.8 5.2 5.6 V
– 6 12
– – 1A
90 93 98 %
– 0.6 1.2
1.5 2
––
–A
1A
36
31
–
–
1,200
–
38
33
5
60
2,400
–
40
35
–
120
4,000
1
V
V
V
A
A
A
Ver.2015-04-07
-5-
5 Page 
H-Bridge Driver Block Pin Operation Table
Ach
INPUT
SHDNAb
INA1
Low *
High Low
High High
High *
High *
* Don’t Care
INA2
*
*
*
Low
High
OUTPUT
OUTA1 OUTA2
Hi-Z Hi-Z
Low *
High *
* Low
* High
Bch
INPUT
SHDNBb
INB1
Low *
High Low
High High
High *
High *
* Don’t Care
INB2
*
*
*
Low
High
OUTPUT
OUTB1 OUTB2
Hi-Z Hi-Z
Low *
High *
* Low
* High
NJW4814
Ver.2015-04-07
- 11 -
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NJW4814.PDF ] | |
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