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Электронный компонент: NJM2383

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NJM2383
Ver 1.0
- 1 -
DC/DC CONVERTER CONTROL IC
WITH CURRENT SENSE AMPLIFIER
s
GENERAL DESCRIPTION
sPACKAGE OUTLINE










s
FEATURES
q
PWM switching control
q
Operating Voltage
(3.6 to 32V)
q
Wide Oscillator Range
(5 to 350 kHz)
q
ON/OFF Circuit
(High Active)
q
Current Sensing Amplifier
q
Soft-Start Function
q
UVLO(Under Voltage Lockouts)
q
Bipolar Technology
q
Package Outline DIP14, DMP14, SSOP10


s
PIN CONFIGURATION
The
NJM2383
is a low voltage operation DC/DC converter
control IC featuring high side current protection, soft start
and standby functions.
It is suitable for power module application and on-board
regulators.
NJM2383D
NJM2383V
NJM2383M
NJM2383D
NJM2383M
1.NC
2.IN
-
1
3.IN
-
2
4.F.B
5.GND
6.OUT
7.NC
8.NC
9. V
+
10.CS
11.CT
12.REF
13.ON/OFF
14.NC
PIN FUNCTION
1
4
3
2
14
11
12
13
5
6
7
8
9
10
1.IN
-
1
2.IN
-
2
3.F.B
4.GND
5.OUT
6. V
+
7.CS
8.CT
9.REF
10.ON/OFF
PIN FUNCTION
1
4
3
2
5
6
7
8
9
10
NJM2383V
NJM2383
- 2 -

s
BLOCK DIAGRAM

1
V
REF
CURRENT
SENSE AMP
V
+
ERAMP
L.O
U.V.LO
OSC
PWM
9 8
7
6
5
4
3
2
10
CS
CT
ON/OFF REF
IN
-
1 IN
-
2 OUT
GND
F.B
0.52V
11
12
13
14
NC
NC
NC
NC
ON/OFF
"High" Active
(Package: DIP14, DMP14)


1
V
REF
CURRENT
SENSE AMP
V
+
ERAMP
L.O
U.V.LO
OSC
PWM
9 8 7 6
5
4
3
2
10
CS
CT
REF
ON/OFF
IN
-
1 IN
-
2 OUT
GND
F.B
0.52V
ON/OFF
"High" Active
(Package: SSOP10)
NJM2383
- 3 -

s
ABSOLUTE MAXIMUM RATINGS (Ta=25C)
PARAMETER SYMBOL
MAXIMUM
RATINGS
UNIT
Input Voltage
V
+
36 V
Reference Output Current
I
OR
10
mA
Output Sink Current
I
SINK
200 mA
Differential Input Voltage
V
ID
2.5 V
Common Mode Input Voltage
V
IC
-0.3
2.5
V
ON/OFF Control Voltage
V
ON/OFF
-0.3
36 (note)
V
Power Dissipation
P
D
(DIP 14) 700
(DMP 14) 300
(SSOP 14) 250
mW
Operating Temperature Range
T
OPR
-40
+85
C
Storage Temperature Range
T
STG
-50
+125
C
(note) When the supply voltage is less than 36V, the absolute maximum input voltage is equal to the supply voltage.

s
ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33k,C
T
=1000pF,V
ON/OFF
=3V,Ta=25C)

REFERENCE VOLTAGE BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Output Voltage
V
REF
I
OR
=1mA 2.45
2.50
2.55
V
Line Regulation
L
INE
V
+
=3.6
32V, I
OR
=1mA
6.8
20.7
mV
Load Regulation
L
OAD
I
OR
=0.1
5.0mA
5 30
mV

OSCILLATOR BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Oscillation Frequency
f
OSC
R
T
=33k, C
T
=1000pF 85
105
125
kHz
Oscillate Fluctuations1
(Line Fluctuations)
f
dV
V
+
=3.6
32V
1 %
Oscillate Fluctuations2
(Temp Fluctuations)
f
dT
Ta=-40
85C
5 %

CURRENT SENSE AMPLIFIER BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Input Offset Voltage1
V
IO
1
2
7 mV
Input Offset Current1
I
IO
1
5
nA
Input Bias Current1
I
B
1
20 100 nA
Open Loop Gain1
A
V
1
90
dB
Gain Bandwidth Product1
G
B
1
0.6
MHz
Input Common Mode
Voltage Ratio1
V
ICM
1
0
V
REF
-0.8
V
Maximum Output Voltage1
(F.B Pin)
V
OM-
1 R
NF
=100k
1
V
Maximum Source Current1
(F.B Pin)
I
OM+
1 V
OM
=0.5V 40
85
200
A
NJM2383
- 4 -
s
ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33k,C
T
=1000pF,V
ON/OFF
=3V,Ta=25C)

ERROR AMPLIFIER BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Reference Voltage2
V
B
2
0.51 0.52 0.53 V
Input Bias Voltage2
I
B
2
5 100 nA
Open Loop Gain2
A
V
2
90
dB
Gain Bandwidth Product2
G
B
2
0.6
MHz
Maximum Output Voltage2
(F.B Pin)
V
OM-
2 R
NF
=100k
1
V
Maximum Source Current2
(F.B Pin)
I
OM+
2 V
OM
=0.5V 40
85
200
A

PWM COMPARATE BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Input Threshold Voltage
(F.B Pin)
V
TH0
dutycycle=0%
(note)
1.65
1.75
V
Input Threshold Voltage
(F.B Pin)
V
TH100
dutycycle=100%
(note)
2.10
V

SOFT START CIRCUIT BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Input Bias Current
(CS Pin)
I
BCS
CS
Pin=1.8V
250 650 nA
Input Threshold Voltage
(CS Pin)
V
THCS0
dutycycle=0%
(note)
0.25
0.35
V
Input Threshold Voltage
(CS Pin)
V
THCS50
dutycycle=100%
(note)
0.7
V

UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
ON Threshold Voltage
V
THON
2.70
V
OFF Threshold Voltage
V
THOFF
2.52
V
Hysteresis Voltage
V
HYS
60 180
mV

OUTPUT BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
L Output Voltage (OUT Pin)
V
OL
Output Sink Current=100mA
0.25
0.65
V
NJM2383
- 5 -

s
ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33k,C
T
=1000pF,V
ON/OFF
=3V,Ta=25C)

ON/OFF BLOCK
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
OFF Threshold Voltage
(ON/OFF Pin)
V
OFF
0.3 V
ON Threshold Voltage
(ON/OFF Pin)
V
ON
1.1
V
Input Bias Current
(ON/OFF Pin)
I
ON/OFF
V
ON/OFF
=3V
100
120
A

GENERAL CHARACTERISTICS
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
Stand-by Current
I
CCSTBY
Stand-by Mode, V
ON/OFF
=0V
12
20
A
Latch Mode
Threshold Voltage (CS Pin)
V
THLA
1.2 1.5 1.8 V
Quiescent Current
I
CCLA
Latch
Mode
1.6 2.2 mA
Average Quiescent Current
I
CCAV
RL= , dutycycle=50%
5.5
10
mA
(note) DutyCycle is defined as follows:
DutyCycle=0%: IC output transistor is OFF.
DutyCycle=100%: IC output transistor is ON.


s
TYPICAL APPLICATIONS
1
V
REF
CURRENT
SENSE AMP
ERAMP
L.O
U.V.LO
OSC
PW M
9 8 7 6
5
4
3
2
10
0.52V
36k
GND
2.50V
V
+
V
OUT
330k 180k
4.7F
1000pF
ON/OFF
CONTROL
ON/OFF
"High" Active
(Package:SSOP10)