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Электронный компонент: NJM2384V

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NJM2384
Ver 1.1
- 1 -
DC/DC CONVERTER CONTROL IC
WITH CURRENT SENSE AMPLIFIER
GENERAL DESCRIPTION
PACKAGE OUTLINE









FEATURES
PWM switching control
Operating Voltage
3.6V to 32V
Wide Oscillator Range
5kHz to 500 kHz
Current Sensing Amplifier
Soft-Start Function
UVLO (Under Voltage Lockouts)
Bipolar Technology
Package Outline DIP14, DMP14, SSOP10


PIN CONFIGURATION
The
NJM2384
is a low voltage operation DC/DC converter
control IC featuring high side current protection and soft start
functions.
It is suitable for battery charger, power module application
and on-board regulators.
NJM2384D
NJM2384V
NJM2384M
NJM2384D
NJM2384M
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.IN
+
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.IN
+
PIN FUNCTION
1
4
3
2
5
6
7
8
9
10
NJM2384V




NJM2384
- 2 -

BLOCK DIAGRAM

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


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



NJM2384
- 3 -

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
Power Dissipation
P
D
(DIP 14)
700
(DMP 14)
300
(SSOP 10) 250
mW
Operating Temperature Range
T
OPR
-40
+85
C
Storage Temperature Range
T
STG
-50
+150
C


ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33k,C
T
=1000pF,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=-40C
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
50 nA
Input Bias Current1
I
B
1
5 100 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




NJM2384
- 4 -
ELECTRICAL CHARACTERISTICS (V
+
=6V,R
T
=33k,C
T
=1000pF,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

GENERAL CHARACTERISTICS
PARAMETER SYMBOL TEST
CONDITION MIN.
TYP.
MAX.
UNIT
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.



NJM2384
- 5 -

TYPICAL APPLICATIONS
1
V
REF
CURRENT
SENSE AMP
ERAMP
L.O
U.V.LO
OSC
PWM
9 8 7 6
5
4
3
2
10
0.52V
GND
2.50V
Vin
Vout
36k
330k
180k
4.7uF
1000pF
(Package:SSOP10)