NJRC NJM2340M

NJM2340
HIGH PRECISION DC/DC CONVERTER CONTROL IC
■GENERAL DESCRIPTION
NJM2340 is a high precision DC/DC converter control IC
with current sense amplifier.
It uses a low side current sensing which reduces external
components and improves accuracy.
It is applicable for a wide range of application since it
features high operating voltage and small outline packages.
■PACKAGE OUTLINE
NJM2340M
NJM2340RB1
■FEATURES
●PWM switching control
●Operating Voltage
(3.6 to 32V)
●Wide Oscillator Range
(20kHz to 500 kHz)
●Duty Cycle
(0% to 100%)
●Current Sensing Amplifier
●High Precision Reference Voltage
Voltage Detect: 1V±1.5%
Current Detect: 150mV±4%
●Bipolar Technology
●Package Outline
DMP8, TVSP8
■PIN CONFIGURATION
1
8
2
7
3
6
4
5
NJM2340M
NJM2340RB1
Pin Function
1.IN1
2.IN2
3.F.B
4.GND
5.OUT
6.CT
7.VREF
8.V+
Ver 2.0 - 1 -
NJM2340
■BLOCK DIAGRAM
V+
VREF
CT
8
7
6
VREF
OUT
5
OSC
ERROR AMP
1V
PWM
CURRENT
SENSE AMP
0.15V
1
2
3
IN1
IN2
F.B
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C )
PARAMETER
SYMBOL
RATINGS
+
Maximum Supply Voltage
V
36
Output Sink Current
ISINK
15
(DMP8)
300
Power Dissipation
PD
(TVSP8) 320
Operating Temperature Range
Topr
-40 ∼ +85
Storage Temperature Range
Tstg
-50 ∼ +150
4
GND
UNIT
V
mA
mW
°C
°C
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER
Supply Voltage
Oscillation Frequency
Oscillator Timing Resistance
-2-
SYMBOL
V+
fosc
RT
MIN.
3.6
20
20
MAX.
32
500
100
UNIT
V
kHz
kΩ
NJM2340
■ELECTRICAL CHARACTERISTICS (V+=12V,Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER
SYMBOL
TEST CONDITION
Output Voltage
Line Regulation
Load Regulation
VREF
LINE
LOAD
OSCILLATOR BLOCK
PARAMETER
SYMBOL
Oscillation Frequency
fOSC
CURRENT SENSE AMPLIFIER BLOCK
PARAMETER
SYMBOL
Reference Voltage1
Input Bias Voltage1
Maximum Output Voltage1
(F.B Pin)
Maximum Source Current1
(F.B Pin)
ERROR AMPLIFIER BLOCK
PARAMETER
Reference Voltage2
Input Bias Voltage2
Maximum Output Voltage2
(F.B Pin)
Maximum Source Current2
(F.B Pin)
PWM COMPARATE BLOCK
PARAMETER
Input Threshold Voltage (F.B Pin)
Input Threshold Voltage (F.B Pin)
OUTPUT BLOCK
PARAMETER
L Output Voltage (OUT Pin)
GENERAL CHARACTERISTICS
PARAMETER
Average Quiescent Current
MIN.
TYP.
MAX.
UNIT
V =3.6 ∼ 32V, IOR=1mA
IOR=0.1 ∼ 5.0mA
1.98
–
–
2.00
4.0
6.0
2.02
20
40
V
mV
mV
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
315
350
385
kHz
MIN.
TYP.
MAX.
UNIT
156
100
–
mV
nA
V
0.9
200
V
µA
IOR=1mA
+
RT=27kΩ, CT=220pF
TEST CONDITION
VB 1
IB1
VOM+1
RNF=100kΩ
144
–
–
VOM-1
IOM1
RNF=100kΩ
VOM1=0.5V
0.6
40
150
20
VREF
-0.15
0.75
85
MIN.
TYP.
MAX.
UNIT
1.015
100
–
V
nA
V
0.9
200
V
µA
SYMBOL
TEST CONDITION
VB 2
IB2
VOM+2
RNF=100kΩ
0.985
–
–
VOM-2
IOM2
RNF=100kΩ
VOM2=0.5V
0.6
40
1.000
20
VREF
-0.15
0.75
85
MIN.
TYP.
MAX.
UNIT
VOM–
1.0
1.4
1.1
–
V
V
MIN.
TYP.
MAX.
UNIT
–
0.5
0.7
V
MIN.
TYP.
MAX.
UNIT
–
1.5
2.0
mA
SYMBOL
VTH0
VTH100
SYMBOL
VOL
SYMBOL
ICCAV
TEST CONDITION
duty·cycle=0% (note)
duty·cycle=100% (note)
TEST CONDITION
ISINK=10mA
TEST CONDITION
RL=∞, duty·cycle=50%
(note) Duty·Cycle is defined as follows:
Duty·Cycle=0%: IC output transistor is OFF.
Duty·Cycle=100%: IC output transistor is ON.
-3-
NJM2340
■TYPICAL APPLICATION
VIN
L
Q1
RT
27kΩ
CT
220pF
RBE
V+
8
VREF
7
VOUT
CT
VREF
OUT
6
RBC
5
OSC
ERROR AMP
R2
1V
PWM
CIN
COUT
D1
CURRENT
SENSE AMP
0.15V
1
IN1
2
IN2
CNF2
GNDIN
CNF1
3
4
F.B
GND
R1
RNF2
RNF1
RSC
RCIN
-4-
GNDOUT
NJM2340
■TIPICAL CHARACTERISTICS
1000
CT=100pF
CT=220pF
100
Oscillator Frequency
f OSC (kHz)
Osillator Frequency
f OSC (kHz)
1000
Oscillator Frequency vs. Timing Resistor
(V+=12V,Ta=25°C)
CT=1000pF
CT=4700pF
RT=47kΩ
RT=20kΩ
100
RT=100kΩ
10
10
Timing Resistor RT (kΩ)
100
1000
Timing Capacitor CT (pF)
Reference Voltage vs. Output Current
(V+=12V,Ta=25°C)
L Output Voltage vs. Source Current
(V+=12V,Ta=25°C)
10
0.8
L Output Voltage VOL (V)
2.5
10
100
2
1.5
1
0.5
0
10000
0.6
0.4
0.2
0
0
5
10
15
20
25
30
0
3
Output Current IOR (mA)
Average Quiescent Current
ICC (mA)
Reference Voltage VREF (V)
Oscillator Frequency vs. Timing Capacitor
(V+=12V,Ta=25°C)
6
9
12
15
Source Current ISOURCE (mA)
Average Quiescent Current
(RL= ∞ ,duty·cycle=50%,Ta=25°C)
3
2.5
2
1.5
1
0.5
0
0
10
20
30
40
電源電圧 V+ (V)
-5-
NJM2340
■TIPICAL CHARACTERISTICS
Oscillation Frequency vs. Temperature
(V+=12V,RT=27kΩ,CT=220pF)
Input Threshold Voltage (V)
380
360
340
320
300
VTH100
1.6
1.2
0.8
VTH0
0.4
0
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
L Level Output Voltage vs. Temperaure
(V+=12V,ISINK=10mA)
Average Quisent Current vs. Temperature
(V+=12V,RL= ∞ ,duty·cycle=50%)
3
Average Quisent Current
ICCAV (mA)
0.5
L Output Voltage VOL (V)
2
0.4
0.3
0.2
0.1
2.5
2
1.5
1
0.5
0
0
-50 -25
0
25
50
75 100 125 150
-50 -25
Ambient Temperature Ta (°C)
Reference Voltage1
VB1 (mV)
153
152
50
75 100 125 150
V B1
1.03
1.02
150
1
147
-6-
Reference Voltage 1,2 vs. Temperaure
(V+=12V)
1.01
148
25
Ambient Temperature Ta (°C)
151
149
0
V B2
0.99
0.98
0.97
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Reference Voltage2
VB2 (V)
Oscillation Frequency
f OSC (kHz)
400
Input Threshold Voltage vs. Temperature
(V+=12V)
[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.