NJM#2374AE-TE2 [NJRC]
Switching Regulator/Controller,;
| 型号： | NJM#2374AE-TE2 |
| 厂家： | 
NEW JAPAN RADIO |
| 描述： | Switching Regulator/Controller, |
| 文件： | 总8页 (文件大小：142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
NJM2374A
PWM DC/DC CONVERTER IC
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
The NJM2374A is a PWM DC/DC converter IC.
It features fixed frequency type PWM control for better noise
handling and to avoid intermittent oscillation observed in a
simplified controller.
It is suitable for Step-Up, Step-Down and Inverting applications
for EMI sensitive application.
NJM2374AD
NJM2374AM
NJM2374AV
■FEATURES
●Operating Voltage
(2.5V* to 40V)
(2.5V* to 48V)
(100Hz to 100kHz)
1.5A (max.)
NJM2374AE
●NJM2374AE Operating Voltage
●Wide Oscillator Frequency
●Internal High Power Transistor
●Internal Over Current Limit Circuit
●PWM form Switching Power Supply Control
●Bipolar Technology
●Package Outline
DIP8, DMP8, EMP8, SSOP14
*Ta =25°C. At low temperature, the minimum voltage is 3.0V.
■PIN CONFIGURATION
PIN FUNCTION
1.CS
5.IN+
6.V+
1
2
3
4
8
7
6
5
2.ES
3.CT
7.SI
4.GND
8.CD
NJM2374AD
NJM2374AM
NJM2374AE
PIN FUNCTION
1.CS
1
2
3
4
5
6
7
14
8.IN+
9.NC
13
12
11
10
9
2.NC
3.ES
10.V+
11.NC
12.SI
4.NC
5.CT
6.NC
7.GND
13.NC
14.CD
8
NJM2374AV
Ver.2007-06-08
- 1 -
NJM2374A
■BLOCK DIAGRAM
CS
1
2
3
4
8
7
6
5
CD
Q
S
R
PWM
Logic
1.5A
160Ω
ES
SI
Vth=300mV
Maximum
ON duty 9:1
OSC BLOCK
Ipk Sense
CT
V+
PWM COMP
Vref
1.25V
±2%
GND
ERR.AMP
IN+
(DIP8, DMP8, EMP8: PACKAGE)
CS
NC
ES
1
2
3
4
5
6
7
14
13
12
11
10
9
CD
NC
SI
Q
S
R
PWM
Logic
1.5A
160Ω
Vth=300mV
Maximum
ON duty 9:1
OSC BLOCK
NC
CT
NC
V+
Ipk Sense
PWM COMP
NC
GND
NC
IN+
Vref
1.25V
±2%
8
ERR.AMP
(SSOP14: PACKAGE)
Ver.2007-06-08
- 2 -
NJM2374A
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C )
PARAMETER
Maximum Supply Voltage
SYMBOL
V+
RATINGS
UNIT
40
(NJM2374AE: 48V)
1.5
V
A
V
Output Switch Current
Output Switch Voltage
ISW
40
VSW
(NJM2374AE: 48V)
Comparator Input Voltage
Power Dissipation
-0.3 ~ 40
(NJM2374AE: 48V)
VIR
PD
V
(DIP8)
(DMP8)
(EMP8)
(SSOP14)
875
750 (note1)
1,000 (note1)
375
mW
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
-40 ~ +85
-50 ~ +150
°C
°C
(note1) At on PC board.
In the case of Step-Down and Inverting Conversion with the internal power transistor,
the Output Voltage must be set lower than 6V(-6V).
■POWER DISSIPATION vs. AMBIENT TEMPERATURE
(Topr=-40 to +85°C,Tj= to +150°C)
1200
NJM2374AE
At on PC board
1000
NJM2374AD
800
600
NJM2374AM
At on PC board
400
NJM2374AV
200
0
25
50
75
100
Ambient Temperature Ta (°C)
In the case of SSOP packaging, the power dissipation should carefully
be considered when designing this parts.
Ver.2007-06-08
- 3 -
NJM2374A
■ELECTRICAL CHARACTERISTICS
DC Characteristics (V+=5V, Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Operating Current 1
ICC1
ICC2
CT=1nF, SI=V+, IN+> Vth, ES=GND
–
–
2.8
3.4
4.0
4.5
mA
mA
Operating Current 2
(NJM2374AE Only)
Charge Current
V+=48V, CT=1nF, SI=V+,
IN+> Vth, ES=GND
Ichg
Idis
12
110
–
20
180
0.5
9
30
300
–
µA
µA
VP-P
–
Discharge Current
Voltage Swing
VOSC
Iratio
Discharge to Charge
Current Ratio
SI=V+
–
–
Peak Current
Sense Voltage
Saturation Voltage 1
Vipk
Vsat1
Vsat2
Rbias
Ichg=Idis
250
–
300
1.0
350
1.3
0.7
–
mV
V
Darlington Connection
(CS=CD), ISW=0.7A
ISW=0.7A, Ic(driver)=50mA
(Forced β≈14)
Saturation Voltage 2
–
0.5
V
Output Transistor
Bias Resistance
DC Voltage Gain
–
160
Ω
hFE
ISW=0.7A, VCE=5.0V
35
–
120
10
–
–
–
Collector Off-State
Current
IC(Off)
VCE=40V
(NJM2374AE: VCE=48V)
nA
Threshold Voltage
Vth
IIB
1.225
–
1.250
40
1.275
400
V
Input Bias Current
IN+=0V
nA
(note) Output switch tests are performed under pulsed conditions to minimize power dissipation.
■TIMING CHART
High Voltage
Detect
Current-Limit
Active Point
Reference
Voltage
Output
Voltage
Oscillator
Waveform
HIGH
OSC Block to
FF Reset
LOW
OFF
Collector-Emitter
Voltage
ON
Ver.2007-06-08
- 4 -
NJM2374A
■TIPICAL CHARACTERISTICS
Switch ON/OFF Time vs. Timing Capacitor
(V+=5V,SI=V+,Pin5=GND,Ta=25°C)
Oscillator Frequency vs. Timing Capacitor
(V+=5V,SI=V+,Pin5=GND,Ta=25°C)
1000
100
10
1000
100
10
tON
tOFF
1
1
100
1000
10000
100
1000
10000
Timing Capacitor CT (pF)
Timing Capacitor CT (pF)
Saturation Voltage 2 vs. Collector Current
(V+=5V,Ic(driver)=50mA,β=14,Ta=25°C)
Saturation Voltage 1 vs. Collector Current
(V+=5V,CS=CD,Ta=25°C)
2
1.5
1
2
1.5
1
0.5
0
0.5
0
0
0.5
1
1.5
2
0
0.5
1
1.5
2
Collector Current IC (A)
Collector Current IC (A)
Operating Current vs. Operating Voltage
(CT=1nF,SI=V+,IN+>Vth,ES=GND,Ta=25°C)
4
3
2
1
0
0
5
10 15 20 25 30 35 40
Operating Voltage V+ (V)
Ver.2007-06-08
- 5 -
NJM2374A
■TIPICAL CHARACTERISTICS
Discharge to Charge Current Ratio vs.
Temperature (V+=5V,SI=V+)
Threshold Voltage vs. Temperature
(V+=5V)
1.3
1.28
1.26
1.24
1.22
10
9
8
7
6
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Saturation Voltage 1 vs. Temperature
(V+=5V,CS=CD,ISW=0.7A)
Saturation Voltage 2 vs. Temperature
(V+=5V,ISW=0.7A,Ic(driver)=50mA,β=14)
1.2
1.1
1
0.8
0.6
0.4
0.2
0
0.9
0.8
0.7
0.6
-50 -25
0
25 50 75 100 125 150
-50 -25
0
25 50 75 100 125 150
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Operating Current vs. Temperature
(V+=5V,CT=1nF,SI=V+,IN+>Vth,ES=GND)
5
4
3
2
1
0
-50 -25
0
25 50 75 100 125 150
Ambient Temperature Ta (°C)
Ver.2007-06-08
- 6 -
NJM2374A
■TYPICALAPPLICATIONS
Step-Down Converter
RSC
VIN=25V
0.22Ω
L1 220µH
V
OUT=5V
8
4
1
3
7
6
2
5
R2 3.6kΩ
NJM2374A
R1
1.2kΩ
COUT
470µF
CIN
100µF
CT
470pF
D1
In the case of Step-Down Conversion with the internal power transistor,
the Output Voltage must be set lower than 6V.
Step-Up Converter
RSC
V
IN=14V
0.22Ω
L1 180µH
D1
VOUT=30V
RC
180Ω
COUT
150µF
R2
46kΩ
8
4
1
3
7
6
2
5
NJM2374A
R1
2kΩ
CIN
100µF
CT
1500pF
Inverting Converter
RSC
V
IN=5V
0.22Ω
D1
VOUT=-5V
8
4
1
3
7
6
2
5
R2 1.2kΩ
NJM2374A
CIN
100µF
R1
3.6kΩ
L1
100µH
CT
680pF
COUT
1000µF
In the case of Inverting Conversion with the internal power transistor,
the Output Voltage must be set lower than -6V.
D1 use to schottky diode.
In the case of SSOP packaging, the power dissipation should carefully
be considered when designing this parts.
Ver.2007-06-08
- 7 -
NJM2374A
Step-Down Converter (High Current)
RSC
0.05Ω
RBE
75Ω
VIN=20V
RBC
300Ω
2SA1010
L1 33µF
V
OUT=10V
8
4
1
3
7
6
2
5
R2 70kΩ
NJM2374A
R1
10kΩ
COUT
300µF
CIN
300µF
CT
330pF
D1
Step-Up Converter (High Current)
RSC
VIN=5V
0.075Ω
L1 22µH
D1
VOUT=7V
RC2
680Ω
RC1
100Ω
COUT
940µF
R2
46kΩ
8
4
1
2SC3255
7
6
2
5
NJM2374A
3
RBE
220Ω
R1
10kΩ
CIN
940µF
CT
330pF
D1 use to schottky diode.
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Ver.2007-06-08
- 8 -
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