NJW4814MLE [NJRC]

HALF BRIDGE BASED PRPHL DRVR,;
NJW4814MLE
型号: NJW4814MLE
厂家: NEW JAPAN RADIO    NEW JAPAN RADIO
描述:

HALF BRIDGE BASED PRPHL DRVR,

驱动 接口集成电路
文件: 总16页 (文件大小:305K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
NJW4814  
Dual H-Bridge Driver with Boost Converter  
GENERALDESCRIPTION  
PACKAGE OUTLINE  
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.  
NJW4814MLE  
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.  
FEATURES  
Boost Converter Block  
Output Switch Voltage  
Switching Current  
40V max.  
1.5Amin.  
PWM Control  
Operating Voltage Range  
Oscillation Frequency Range  
Soft Start Function  
2.7 to 5.5V  
380k to 1MHz  
48ms typ.  
Over Current Protection  
Over Voltage Protection  
H-Bridge Driver Block  
Internal 2 Channel H-Bridge  
Each Channel Operates Individually  
Over Current Protection  
Operating Voltage Range  
Switching Frequency  
300mAtyp.  
7.0 to 35V  
300kHz max.  
Output Shut Down Control  
Fault Indicator Output  
Under Voltage Lockout  
Built-in Thermal Shutdown  
Standby Function  
Package Outline  
NJW4814MLE : EQFN24-LE  
Ver.2015-04-07  
- 1 -  
NJW4814  
PIN CONFIGURATION  
PIN FUNCTION  
1. IN-  
13. OUTA1  
14. PGND  
15. OUTB1  
16. VDD_HB  
17. VOVP  
18. OUTB2  
19. SW  
20. PGND  
21. RADJ  
22. FB  
18 17 16 15 14 13  
2. VDD_SW  
3. STBYb  
4. SHDNAb  
5. SHDNBb  
6. INA1  
7. INA2  
8. INB1  
9. INB2  
10. FLT  
12  
11  
10  
9
SW  
PGND  
RADJ  
19  
20  
21  
OUTA2  
PGND  
FLT  
FB 22  
RT 23  
INB2  
8
INB1  
11. PGND  
12. OUTA2  
23. RT  
24. GND  
7
GND 24  
INA2  
1
2
3
4
5
6
Exposed PAD on  
backside connect to GND  
< Top View>  
NJW4814MLE  
Ver.2015-04-07  
- 2 -  
NJW4814  
BLOCK DIAGRAM  
UVLO  
VDD_SW  
Standby  
ON/OFF  
STBYb  
FB  
SW  
PWM  
ERR.AMP  
Oscillator  
IN-  
Buffer  
RADJ  
Vref 1.0V  
Soft Start  
Thermal  
Shutdown  
OVP  
OCP  
VOVP  
RT  
VDD_HB  
FLT  
High Side  
Gate Driver  
High Side  
Gate Driver  
UVLO  
OUTA1  
OUTA2  
INA1  
Low Side  
Gate Driver  
Low Side  
Gate Driver  
Control  
Logic  
SHDNAb  
Control  
Logic  
INA2  
OCP  
High Side  
High Side  
Gate Driver  
Gate Driver  
OUTB1  
OUTB2  
INB1  
Control  
Logic  
Low Side  
Low Side  
SHDNBb  
Gate Driver  
Gate Driver  
Control  
Logic  
INB2  
GND  
PGND  
Ver.2015-04-07  
- 3 -  
NJW4814  
ABSOLUTE MAXIMUM RATINGS  
PARAMETER  
(Ta=25°C)  
UNIT  
SYMBOL  
MAXIMUM RATINGS  
Boost Converter Block  
Supply Voltage  
SW pin Voltage  
RADJ pin Voltage  
IN- pin Voltage  
STBYb pin Voltage  
VOVP pin Voltage (*2)  
VDD_SW  
VSW  
VRADJ  
VIN-  
VSTBYb  
VOVP  
-0.3 to +6  
-0.3 to +40  
-0.3 to +6 (*1)  
-0.3 to +6 (*1)  
-0.3 to +6 (*1)  
-0.3 to +40  
V
V
V
V
V
V
H-Bridge Driver Block  
Supply Voltage  
SHDNAb, SHDNBb pin  
Voltage  
VDD_HB  
VSHDNAb  
VSHDNBb  
-0.3 to +40  
V
V
-0.3 to +6 (*1)  
INA1, INA2, INB1, INB2 pin  
Voltage  
VINA1 , VINA2  
VINB1 , VINB2  
-0.3 to +6 (*1)  
V
General  
FLTpin Voltage  
VFLT  
PD  
-0.3 to +6  
V
910 (*3)  
2,100 (*4)  
-40 to +150  
-40 to +85  
-40 to +150  
Power Dissipation  
mW  
Junction Temperature Range  
Operating Temperature Range  
Storage Temperature Range  
Tj  
Topr  
Tstg  
C
C
C
(*1): When Supply voltage is less than +6V, the absolute maximum voltage is equal to the Supply voltage.  
(*2): VOVP pin should be connected to VDD_HB pin.  
(*3): Mounted on glass epoxy board. (101.5×114.5×1.6mm: based on EIA/JEDEC standard, 2Layers FR-4, with Exposed Pad)  
(*4): Mounted on glass epoxy board. (101.5×114.5×1.6mm: based on EIA/JEDEC standard, 4Layers FR-4, with Exposed Pad)  
(For 4Layers:Applying 99.5×99.5mm inner Cu area and a thermal via hole to a board based on JEDEC standard JESD51-5)  
RECOMMENDED OPERATING CONDITIONS  
PARAMETER  
SYMBOL  
MIN.  
TYP.  
MAX.  
UNIT  
Boost Converter Block  
Supply Voltage  
STBYb pin Voltage  
Timing Resistor  
VDD_SW  
VSTBYb  
RT  
2.7  
0
68  
380  
100  
700  
5.5  
VDD_SW  
200  
V
V
k
Oscillating Frequency  
fOSC  
1,000  
kHz  
H-Bridge Driver Block  
Supply Voltage  
Output Switch DC Current  
SHDNAb, SHDNBb pin  
Voltage  
IN1A, IN1B, IN2A, IN2B pin  
Voltage  
FLTpin Voltage  
VDD_HB  
IOM  
7
0
20  
35  
V
mA  
VSHDNAb  
VSHDNBb  
VINA1 , VINA2  
VINB1 , VINB2  
VFLT  
0
VDD_SW  
V
0
0
VDD_SW  
5.5  
V
V
Ver.2015-04-07  
- 4 -  
NJW4814  
ELECTRICALCHARACTERISTICS  
Boost Converter Block  
(Unless otherwise noted, VDD_SW=VSTBYb=3.7V, RT=100k , Ta=25 C)  
PARAMETER  
SYMBOL  
TESTCONDITION  
MIN.  
TYP.  
MAX.  
UNIT  
Under Voltage Lockout Block  
UVLO Release Voltage  
UVLO Operate Voltage  
UVLO Hysteresis Voltage  
VRUVLO_SW  
VDUVLO_SW  
VUVLO_SW  
2.1  
2.0  
2.4  
2.2  
0.2  
2.7  
2.5  
V
V
V
VRUVLO_SW - VDUVLO_SW  
Soft Start Block  
Soft StartTime  
TSS  
VB=0.95V  
34  
48  
60  
ms  
Oscillator Block  
Oscillation Frequency  
fOSC  
fDV  
630  
700  
1
770  
kHz  
%
RT=100k  
Oscillation Frequency  
deviation (Supply voltage)  
Oscillation Frequency  
deviation (Temperature)  
VDD_SW=3.0V to 5.5V  
fDT  
3
%
Ta= -40 C to +85 C  
ErrorAmplifier Block  
Reference Voltage  
Input Bias Current  
IN- pin Clamp Voltage  
Short IN- and FB,  
Measuring IN- Pin  
VB=1.0V  
VSTBYb=0V, VDD_SW=5.5V,  
ICLIN-=10 A  
VB  
IB  
-1.0%  
-0.1  
1.00  
+1.0%  
+0.1  
5.6  
V
A
V
VCLIN-  
4.8  
5.2  
RADJ pin  
FET ON Resistance  
RADJ pin  
FETLeak Current  
RON_RADJ IRADJ=10mA  
6
12  
1
ILEAK_RADJ VSTBYb=0V, VRADJ=3.3V  
A
PWM Comparate Block  
Maximum Duty Cycle  
MAXDUTY VIN-=0.9V  
90  
93  
98  
%
Output Block  
Switching FET  
ON Resistance  
RON_SW  
ISW=100mA  
0.6  
1.2  
Switching Current Limit  
Switching FET Leak Current  
ILMT_SW  
ILEAK_SW  
1.5  
2
1
A
A
VSTBYb=0V, VSW=40V  
Overvoltage Protection Block  
OVP Operate Voltage  
OVP Release Voltage  
VDOVP  
VROVP  
ΔVOVP  
36  
31  
38  
33  
5
40  
35  
V
V
V
OVP Hysteresis Voltage  
VDOVP -VROVP  
VOVP= VDD_HB=35V,  
OVP Release  
VOVP= VDD_HB=40V,  
OVP Operate  
VSTBYb=0V,  
VOVP= VDD_HB=40V  
OVP pin Input Current 1  
OVP pin Input Current 2  
OVP pin Leak Current  
IOVP1  
IOVP2  
1,200  
60  
2,400  
120  
4,000  
1
A
A
A
IOVP_LEAK  
Ver.2015-04-07  
- 5 -  
NJW4814  
ELECTRICALCHARACTERISTICS  
H-Bridge Driver Block  
(Unless otherwise noted, VDD_SW=VSTBYb=VSHDNAb=VSHDNBb=3.7V, VDD_HB=25V, RT=100k , Ta=25 C)  
INA1, INA2, INB1, INB2 pin, OUTA1, OUTA2, OUTB1, OUTB2 pin and SHDNAb, SHDNBb pin are common  
PARAMETER  
SYMBOL  
TESTCONDITION  
VRUVLO_HB - VDUVLO_HB  
VIN = 3.3 V  
MIN.  
TYP.  
MAX.  
UNIT  
Under Voltage Lockout Block  
UVLO Release Voltage  
UVLO Operate Voltage  
UVLO Hysteresis Voltage  
VRUVLO_HB  
VDUVLO_HB  
VUVLO_HB  
5.6  
5.0  
6.2  
5.6  
0.6  
6.8  
6.2  
V
V
V
Input Block  
IN pin High Voltage  
IN pin Low Voltage  
IN pin Input Current  
VIHIN  
VILIN  
IIIN  
1.0  
0
VDD_SW  
0.4  
V
V
A
1
SHDNb pin High Voltage  
(Operating Mode)  
SHDNb pin Low Voltage  
(Shutdown Mode)  
SHDNb pin  
VIHSHDNb  
VILSHDNb  
RPDSHDNb VSHDNb=3.3V  
1.0  
0
VDD_SW  
0.4  
V
V
k
210  
300  
390  
Pull-down Resistance  
Output Block  
High Side SW ON Resistance  
Low Side SW ON Resistance  
RDSH  
RDSL  
IOSOURCE=20mA  
IOSINK=20mA  
4.0  
4.0  
6.0  
6.0  
8.0  
8.0  
High Side  
Over Current Detection  
Low Side  
Over Current Detection  
Output RiseTime  
IDCTH  
IDCTL  
High-Side  
Low-Side  
200  
200  
300  
300  
400  
400  
mA  
mA  
tr  
tf  
VIN=0 to 3.3V  
VIN=0 to 3.3V  
VIN=0 to 3.3V  
VIN=0 to 3.3V  
VIN=0 to 3.3V  
VIN=0 to 3.3V  
400  
340  
200  
180  
310  
270  
ns  
ns  
Output FallTime  
Rise Dead Time  
Fall Dead Time  
Rise DelayTime  
Fall DelayTime  
Input Frequency  
Dtr  
ns  
Dtf  
ns  
td_ON  
td_OFF  
fIN  
ns  
ns  
300  
kHz  
High Side SW  
OFF Leak Current  
Low Side SW  
OFF Leak Current  
OUT pin – VDD pin  
Potential Difference  
GND pin – OUTpin  
Potential Difference  
VSTBYb=VSHDNb=0V,  
VOUT=0V  
VSTBYb=VSHDNb=0V,  
VOUT=25V  
VSTBYb=VSHDNb=0V,  
IORH=20mA  
VSTBYb=VSHDNb=0V,  
IORL=20mA  
IOLEAKOUTH  
IOLEAKOUTL  
VPDOV  
1
A
A
1
0.7  
0.7  
1.0  
1.0  
V
VPDGO  
V
Ver.2015-04-07  
- 6 -  
NJW4814  
ELECTRICALCHARACTERISTICS  
General Characteristics  
(Unless otherwise noted, VDD_SW=VSTBYb=VSHDNAb=VSHDNBb=3.7V, VDD_HB=25V, RT=100k , Ta=25 C)  
INA1, INA2, INB1, INB2 pin, OUTA1, OUTA2, OUTB1, OUTB2 pin and SHDNAb, SHDNBb pin are common  
PARAMETER  
SYMBOL  
TESTCONDITION  
MIN.  
TYP.  
MAX.  
UNIT  
STBYb pin High Voltage  
(Operating Mode)  
STBYb pin Low Voltage  
(Standby Mode)  
STBYb pin  
Pull Down Resistance  
VIHSTBYb  
1.0  
VDD_SW  
V
VILSTBYb  
0
0.4  
V
k
RPDSTBYb VSTBYb=3.3V  
210  
300  
390  
FLTpin  
Low Level Output Voltage  
FLTpin OFF Leak Current  
Quiescent Current  
(Switching Regulator Block)  
Quiescent Current  
(H-Bridge Driver Block)  
Quiescent Current  
(Standby)  
VLFLT  
IOLEAKFLT VFLT=5.5V  
0.20  
0.40  
1
V
A
IFLT=500 A  
IQSW  
IQHB  
No Load  
1.9  
2.8  
mA  
fINA= fINB=10kHz  
1.0  
1.6  
2.0  
3.6  
mA  
A
antiphase 50% Duty Cycle  
VSTBYb=VSHDNb=0V  
VDD_HB=0V,  
IQSTBY  
Ver.2015-04-07  
- 7 -  
NJW4814  
TYPICAL CHARACTERISTICS (Boost Converter Block)  
Oscillation Frequency vs. Timing Resistor  
Oscillation Frequency vs. Temperature  
(VDD_SW=3.7V, Ta=25ºC)  
(VDD_SW=3.7V, RT=100kW)  
1000  
800  
780  
760  
740  
720  
700  
680  
660  
640  
620  
600  
900  
800  
700  
600  
500  
400  
300  
60  
80  
100 120 140 160 180 200  
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Timing Resistor RT (kW)  
Output ON Resistance vs. Temperature  
(VDD_SW=3.7V, ISW=100mA)  
Reference Voltage vs. Temperature  
(VDD_SW=3.7V)  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
1.04  
1.03  
1.02  
1.01  
1.00  
0.99  
0.98  
0.97  
0.96  
-50 -25  
0
25 50 75 100 125 150  
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Ambient Temperature Ta (ºC)  
Switching Current Limit vs. Temperature  
(VDD_SW=3.7V)  
3
2.5  
2
1.5  
1
0.5  
0
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Ver.2015-04-07  
- 8 -  
NJW4814  
TYPICAL CHARACTERISTICS (H-Bridge Driver Block)  
High Side SW ON Resistance vs. Temperature  
Low Side SW ON Resistance vs. Temperature  
(VDD_HB=25V, IOSINK=20mA)  
(VDD_HB=25V, IOSOURCE=20mA)  
12  
12  
10  
8
10  
8
6
6
4
4
2
2
0
0
-50 -25  
0
25 50 75 100 125 150  
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Ambient Temperature Ta (ºC)  
High Side Over Current Detection vs. Temperature  
(VDD_HB=25V)  
400  
Low Side Over Current Detection vs. Temperature  
(VDD_HB=25V)  
400  
350  
300  
250  
200  
150  
100  
50  
350  
300  
250  
200  
150  
100  
50  
0
0
-50 -25  
0
25 50 75 100 125 150  
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Ambient Temperature Ta (ºC)  
Output Rise Time vs. Temperature  
(VDD_HB=25V, VIN=0 to 3.3V)  
Output Fall Time vs. Temperature  
(VDD_HB=25V, VIN=0 to 3.3V)  
600  
500  
400  
300  
200  
100  
0
600  
500  
400  
300  
200  
100  
0
-50 -25  
0
25 50 75 100 125 150  
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Ambient Temperature Ta (ºC)  
Ver.2015-04-07  
- 9 -  
NJW4814  
TYPICAL CHARACTERISTICS (General Characteristics)  
Quiescent Current vs. Supply Voltage  
Quiescent Current vs. Temperature  
(RT=100kW, No Load, Ta=25ºC)  
(VDD_SW=3.7V, RT=100kW, No Load)  
3
3
2.5  
2
Switching Regulator Block  
Switching Regulator Block  
2.5  
2
1.5  
1
1.5  
1
0.5  
0
0.5  
0
2
3
4
5
6
-50 -25  
0
25 50 75 100 125 150  
Supply Voltage VDD_SW (V)  
Ambient Temperature Ta (ºC)  
Quiescent Current vs. Supply Voltage  
(VDD_SW=3.7V, fINA=fINB=10kHz, Ta=25ºC)  
Quiescent Current vs. Temperature  
(VDD_SW=3.7V, VDD_HB=25V, fIN1=fIN2=10kHz)  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0.0  
H-Bridge Driver Block  
H-Bridge Driver Block  
0
5
10 15 20 25 30 35 40  
Supply Voltage VDD_HB (V)  
-50 -25  
0
25 50 75 100 125 150  
Ambient Temperature Ta (ºC)  
Quiecent Current vs. Input Frequency  
Standby Current vs. Temperature  
(VDD_SW=3.7V, VDD_HB=25V, Ta=25˚C)  
(VDD_SW=3.7V, VDD_HB=0V, VSTBYb=VSHDNb=0V)  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0.0  
10  
9
8
7
6
5
4
3
2
1
0
H-Bridge Driver Block  
0
50  
100  
150  
200  
250  
300  
-50 -25  
0
25 50 75 100 125 150  
Input Frequency fIN (kHz)  
Ambient Temperature Ta (ºC)  
Ver.2015-04-07  
- 10 -  
NJW4814  
H-Bridge Driver Block Pin Operation Table  
Ach  
INPUT  
OUTPUT  
SHDNAb  
Low  
INA1  
INA2  
*
*
OUTA1  
OUTA2  
Hi-Z  
*
*
Low  
High  
*
Hi-Z  
Low  
High  
*
High  
High  
High  
High  
*
*
Low  
High  
Low  
High  
*
*
* Don’t Care  
Bch  
INPUT  
OUTPUT  
SHDNBb  
Low  
INB1  
INB2  
*
*
OUTB1  
Hi-Z  
Low  
High  
*
OUTB2  
Hi-Z  
*
*
Low  
High  
*
High  
High  
High  
High  
*
*
Low  
High  
Low  
High  
*
*
* Don’t Care  
Ver.2015-04-07  
- 11 -  
NJW4814  
Timing Chart  
tr  
tf  
INA1  
90 %  
INA2  
10 %  
INB1  
INB2  
OUTA1  
OUTA2  
90 %  
90 %  
UTB1  
10 %  
10 %  
OUTB2  
td_ON  
td_OFF  
Fig. 1. Output Rise/Fall Time, Rise/Fall DelayTime  
High  
Low  
INA1, INA2,  
INB1, INB2  
VDD_HB  
ON  
OFF  
ON  
OFF  
ON  
Highside SW Gate  
(IC internal)  
Lowside SW Gate  
(IC internal)  
OFF  
ON  
OFF  
ON  
OFF  
PGND  
VDD_HB  
PGND  
90 %  
10 %  
OUTA1, OUTA2,  
OUTB1, OUTB2  
90 %  
tr  
10 %  
tf  
Dead-time  
Dtr  
Dead-time  
Dtf  
Dead-time  
Dtr  
Dead-time  
Dtf  
Dead-time  
Dtr  
Dead-time  
Dtf  
Fig. 2. H-Bridge Driver Block  
Ver.2015-04-07  
- 12 -  
NJW4814  
PIN DESCRIPTIONS  
PIN NAME  
PIN  
NUMBER  
FUNCTION  
Output Voltage Detecting pin.  
1
Connects output voltage through the resistor divider tap to this pin in order to voltage  
of the IN- pin become 1.0V (typ.).  
IN-  
Power Supply pin for SW.REG. block.  
2
3
Insert a bypass capacitor close to the VDD_SW pin – the GND pin connection in  
order to lower high frequency impedance.  
Standby Control pin.  
The STBYb pin is pulled down with 300k (typ.) internally. Normal Operation at the  
time of High Level. Standby Mode at the time of Low Level or OPEN.  
Shutdown Control pin for H-Bridge driverAch.  
The SHDNAb pin is pulled down with 300k (typ.) internally.  
Normal Operation at the time of High Level.  
VDD_SW  
STBYb  
4
SHDNAb  
The FETof H-Bridge driverAch becomes OFF (Hi-Z) by Low Level or OPEN.  
Shutdown Control pin for H-Bridge driver Bch.  
The function is same as 4pin.  
Control input pin for H-Bridge driverAch (one side).  
High Side SW Operation at the time of High Level. Low Side SW Operation at the  
time of Low Level.  
5
6
SHDNBb  
INA1  
Control input pin for H-Bridge driverAch (one side).  
The function is same as 6pin.  
Control input pin for H-Bridge driver Bch (one side).  
The function is same as 6pin.  
Control input pin for H-Bridge driver Bch (one side).  
The function is same as 6pin.  
7
8
9
INA2  
INB1  
INB2  
FLTpin outputs a signal at the time of abnormality.  
You should be connected to the outside power supply through pull up resistance.  
Normally: FET is OFF (Output voltage High Level)  
Abnormality: FET is ON (Output voltage Low Level)  
Power GND pin for H-Bridge driver (Note 1)  
10  
FLT  
11  
12  
PGND  
Output pin of H-Bridge driverAch (one side).  
The output current is limited to 300mA(typ.) by the overcurrent protection function.  
OUTA2  
Output pin of H-Bridge driverAch (one side).  
The function is same as 12pin.  
Power GND pin for H-Bridge driver (Note 1)  
Output pin of H-Bridge driver Bch (one side).  
13  
14  
15  
OUTA1  
PGND  
OUTB1  
The function is same as 12pin.  
Ver.2015-04-07  
- 13 -  
NJW4814  
PIN DESCRIPTIONS (Continued)  
PIN  
PIN NAME  
FUNCTION  
Power Supply pin for H-Bridge driver block.  
NUMBER  
16  
Insert a bypass capacitor close to the VDD_HB pin – the GND pin connection in  
order to lower high frequency impedance.  
VDD_HB  
Overvoltage detection pin of SW.REG.  
When it detected overvoltage, the VOVP pin sinks a current and discharges the  
output voltage.  
VOVP pin should be connected to VDD_HB pin.  
Output pin of H-Bridge driver Bch (one side).  
The function is same as 12pin.  
17  
18  
VOVP  
OUTB2  
19  
20  
Switch Output pin for SW.REG. Power MOSFET  
SW  
Power GND pin for SW.REG. (Note 1)  
PGND  
The RADJ pin becomes the high impedance at standby.  
It prevents a current flowing into the output voltage setting resistor.  
Feedback Setting pin  
21  
RADJ  
22  
The feedback resistor and capacitor are connected between the FB pin and the IN-  
pin.  
FB  
Oscillating Frequency Setting pin byTiming Resistor.  
Oscillating Frequency should set between 380kHz and 1MHz.  
GND pin (Note 1)  
23  
24  
RT  
GND  
Exposed  
PAD  
Connect to GND.  
(Note 1) GND and PGND are connected inside.  
Ver.2015-04-07  
- 14 -  
NJW4814  
H Bridge Driver Block Over Current Protection  
The overcurrent protection function operates when the high side SW current flows more than IDCTH or the low side SW  
current flows more than IDCTL. The overcurrent protection operates in three steps.  
(1) Sensing step  
·Turn off power MOSFETof the switching regulator  
·Turn off power MOSFETof the H-bridge driver  
·Reset a soft start  
·Reset an FB pin voltage  
·Connect a dummy road between VOVP pin-GND pin  
(2) Output stop step  
After the overcurrent detection, 500 ms (typ.) continues an output stop.  
(3) Return step  
After an output stop, the soft start operates. Then the IC operation shifts to normal operation.  
Ver.2015-04-07  
- 15 -  
NJW4814  
APPLICATION EXAMPLE  
L1  
3.3  
H
D1  
VOUT  
VIN  
R4  
100  
C6  
0.1  
C3  
4.7  
C1  
10  
C2  
0.1  
R2  
240 k  
F
F
F
F
C5  
1,500 pF  
VDD_SW  
RT  
SW  
R1  
10 k  
R5  
100 k  
IN-  
R3  
100  
C4  
22 nF  
STBYb  
Stand-by  
FB  
NJW4814  
SHDNAb  
Shutdown  
(H-Bridge Driver Ach.)  
RADJ  
Shutdown  
(H-Bridge Driver Bch.)  
SHDNBb  
RON_RADJ  
VDD_HB  
VOVP  
INA1  
INA2  
INB1  
INB2  
INA1  
INA2  
INB1  
INB2  
R2  
240(k  
10(k  
)
VOUT  
1
VB  
1
1(V) 25.0(V)  
R1  
)
OUTA1  
OUTA2  
OUTB1  
FLT  
FAULT  
Pull-Up  
OUTB2  
GND  
PGND  
R6  
100 k  
[CAUTION]  
Thespecificationsonthisdatabookareonly  
givenforinformation,withoutanyguarantee  
asregardseither mistakesoromissions.The  
applicationcircuitsinthisdatabookare  
describedonlytoshowrepresentativeusages  
oftheproductandnotintendedforthe  
guaranteeorpermissionofanyrightincluding  
theindustrialrights.  
Ver.2015-04-07  
- 16 -  

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