NJM2382
-
1
-
Ver.2012-07-26
SWITCHING REGULATOR CONTROL IC FOR FLYBACK
WITH CURRENT SENSE AMPLIFIER
GENERAL DESCRIPTION PACKAGE OUTLINE
FEATURES
z PWM switching control
z Operating Voltage (3.6 to 32V)
z Wide Oscillator Range (5 to 350 kHz)
z ON/OFF Circuit (High Active)
z Current Sensing Amplifier
z Soft-Start Function
z UVLO(Under Voltage Lockouts)
z Bipolar Technology
z Package Outline DMP14, SSOP10
PIN CONFIGURATION
The NJM2382 is a low voltage operation switching regulator
control IC.
It features totem pole output directly driving external bipola
r
transistor and operates at high switching frequency which improve
s
transient response. In addition, low power standby function i
s
incorporated.
It is suitable for LCD back light, and other portable applications.
NJM2382M
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
NJM2382V
NJM2382V
NJM2382M
NJM2382
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2
-Ver.2012-07-26
BLOCK DIAGRAM
1
VREF
CURRENT
SENSE AMP
V+
ER·AMP
L.O
500Ω
U.V.LO
OSC
PWM
9 8
76 543 2
10
CSCTON/OFF REF
IN-1 IN-2 OUT GNDF.B
0.52V
1112 13 14
NC
NC
NC
NC
ON/OFF
“High” Active
(Package: DMP14)
1
VREF
CURRENT
SENSE AMP
V+
ER·AMP
L.O
500Ω
U.V.LO
OSC
PWM
9 876
5 432
10
CSCTIN+ REF
IN-1 IN-2 OUT GNDF.B
0.52V
(Package: SSOP10)
NJM2382
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3
-
Ver.2012-07-26
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER SYMBOL MAXIMUM RATINGS UNIT
Input Voltage V+ 36 V
Reference Output Current IOR 10 mA
Output Current IO ±50 mA
Differential Input Voltage VID 2.5 V
Common Mode Input Voltage VIC -0.3 ∼ 2.5 V
ON/OFF Control Voltage VON/OFF -0.3 ∼ 36 (note) V
Power Dissipation PD (DMP 14) 300
(SSOP 10) 250 mW
Operating Temperature Range TOPR -40 ∼ +85 °C
Storage Temperature Range TSTG -50 ∼ +150 °C
(note) When the supply voltage is less than 36V, the absolute maximum input voltage is equal to the supply voltage.
ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,VON/OFF=3V,Ta=25°C)
REFERENCE VOLTAGE BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Output Voltage VREF I
OR=1mA 2.45 2.50 2.55 V
Line Regulation LINE V+=3.6 ∼ 32V, IOR=1mA – 6.8 20.7 mV
Load Regulation LOAD IOR=0.1 ∼ 5.0mA – 5 30 mV
OSCILLATOR BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Oscillation Frequency fOSC R
T=33kΩ, CT=1000pF 85 105 125 kHz
Oscillate Fluctuations1
(Line Fluctuations)
fdV V+=3.6 ∼ 32V – 1 – %
Oscillate Fluctuations2
(Temp Fluctuations)
fdT Ta=-40 ∼ 85°C – 5 – %
CURRENT SENSE AMPLIFIER BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Offset Voltage1 VIO1 – 2 7 mV
Input Offset Current1 IIO1 – 5 – nA
Input Bias Current1 IB1 – 20 100 nA
Open Loop Gain1 AV1 – 90 – dB
Gain Bandwidth Product1 GB1 – 0.6 – MHz
Input Common Mode
Voltage Ratio1
VICM1 – 0 ∼
VREF-0.8
– V
Maximum Output Voltage1
(F.B Pin
)
VOM-1 RNF=100kΩ – – 1 V
Maximum Source Current1
(F.B Pin
)
IOM+1 VOM=0.5V 40 85 200 µA
NJM2382
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4
-Ver.2012-07-26
ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,VON/OFF=3V,Ta=25°C)
ERROR AMPLIFIER BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Reference Voltage2 VB2 0.51 0.52 0.53 V
Input Bias Current2 IB2 – 5 100 nA
Open Loop Gain2 AV2 – 90 – dB
Gain Bandwidth Product2 GB2 – 0.6 – MHz
Maximum Output Voltage2
(F.B Pin
)
VOM-2 RNF=100kΩ – – 1 V
Maximum Source Current2
(F.B Pin
)
IOM+2 VOM=0.5V 40 85 200 µA
PWM COMPARATE BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Threshold Voltage
(F.B Pin
)
VTH0 duty·cycle=0% – 1.65 1.75 V
Input Threshold Voltage
(F.B Pin
)
VTH50 duty·cycle=50% – 1.88 – V
Maximum Duty Cycle αM Current Sense Amp.=HIGH
Error Amp.=HIGH ,CS Pin=1.2V
55 64 85 %
SOFT START CIRCUIT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Input Bias Current
(CS Pin
)
IBCS CS Pin=1.8V – 250 650 nA
Input Threshold Voltage
(CS Pin
)
VTHCS0 duty·cycle=0% – 0.25 0.35 V
Input Threshold Voltage
(CS Pin
)
VTHCS50 duty·cycle=50% – 0.52 – V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
ON Threshold Voltage VTHON – 2.70 – V
OFF Threshold Voltage VTHOFF – 2.52 – V
Hysteresis Voltage VHYS 60 180 – mV
OUTPUT BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
H-Output Voltage (OUT Pin) VOH R
L=10kΩ 3.50 4.00 – V
L-Output Voltage (OUT Pin) VOL Output Sink Current=20mA – 0.25 0.65 V
Output Source Current
(OUT Pin
)
ISOURCE OUT Pin=0V 8 11 – mA
NJM2382
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5
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Ver.2012-07-26
ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,VON/OFF=3V,Ta=25°C)
ON/OFF BLOCK
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
OFF Threshold Voltage
(ON/OFF Pin
)
VOFF – – 0.3 V
ON Threshold Voltage
(ON/OFF Pin
)
VON 1.1 – – V
Input Bias Current
(ON/OFF Pin
)
ION/OFF V
ON/OFF=3V – 100 120 µA
GENERAL CHARACTERISTICS
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT
Standby Current ICCSTBY Standby Mode, VON/OFF=0V – 12 20 µA
Latch Mode
Threshold Voltage (CS Pin)
VTHLA 1.2 1.5 1.8 V
Quiescent Current ICCLA Latch Mode – 1.6 2.2 mA
Average Quiescent Current ICCAV RL= , duty·cycle=50% – 3.5 4.8 mA
TYPICAL APPLICATIONS
1
VREF
CURRENT
SENSE AMP
ER·AMP
L.O
500Ω
U.V.LO
OSC
PWM
9 8 7 6
543 2
10
0.52V
36kΩ
GND
2.50V
V+
VOUT
330kΩ 180kΩ4.7µF
1000pF
ON/OFF
CONTROL
ON/OFF
“High” Active
(Package:SSOP10)
NJM2382
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6
-Ver.2012-07-26
TIPICAL CHARACTERISTICS
Operating Current vs. Operating Voltage
(Ta=25°C)
0
1
2
3
4
5
6
0 10203040
Operating Voltage V+ (V)
Operating Voltage ICC (mA)
ICCAV
ICCLA
L Output Voltage vs. Sink Current
(V+=6V,RT=33kΩ,CT=1000pF,Ta=25°C)
0
0.2
0.4
0.6
0.8
1
0 102030405060
Sink Current ISINK (mA)
L Output Voltage VOL (V)
0
1
2
3
4
5
6
7
8
024681012
H Output Voltage vs. Source Current
(V+=6V, RT=33kΩ, CT=1,000pF, Ta=25oC)
Source Current I
SOURCE (mA)
H Output Voltage VOH (V)
1
10
100
1000
10 100 1000 10000 100000
RT=33kΩ
Oscillator Frequency fOSC (kHz)
Oscillator Frequency vs. Timing Capacitor
(V+=6V, Ta=25oC)
Timing Capacitor C
T (pF)
RT=100kΩ
1
10
100
1000
10 100
Oscillator Frequency vs. Timing Resistor
(V+=6V, Ta=25oC)
Timing Resistor R
T (kΩ)
Oscillator Frequency fOSC (kHz)
CT=1,000pF
CT=470pF
2.48
2.49
2.5
2.51
2.52
010203040
Reference Voltage vs. Operating Voltage
(Ta=25oC)
Operating Voltage V+ (V)
Reference Voltage VREF (V)
NJM2382
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7
-
Ver.2012-07-26
TIPICAL CHARACTERISTICS
Maximum Duty Cycle vs. Oscillator Frequency
(V+=6V,Ta=25°C)
0
10
20
30
40
50
60
70
80
10 100 1000
Oscillator Frequency fOSC (kHz)
Maximum Duty Cycle αM (%)
Duty Cycle vs. CS Pin Voltage
(V+=6V,Ta=25°C)
0
10
20
30
40
50
60
70
80
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
CS Pin Voltage VTHCS (V)
Duty Cycle α (%)
NJM2382
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8
-Ver.2012-07-26
TIPICAL CHARACTERISTICS
Oscillator Frequency vs. Temperature
(V+=6V,RT=33kΩ,CT=1000pF)
60
80
100
120
140
160
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Oscillator Frequency
fOSC (kHz)
Reference Voltage vs. Temperature
(V+=6V,IOR=1mA)
2
2.2
2.4
2.6
2.8
3
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Reference Voltage
VREF (V)
H Output Voltage vs. Temperature
(V+=6V,RL=10kΩ,RT=33kΩ,CT=1000pF)
0
2
4
6
8
10
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
H Output Voltage VOH (V)
L Output Voltage vs. Trmperature
(V+=6V,ISINK=20mA,RT=33kΩ,CT=1000pF)
0
0.1
0.2
0.3
0.4
0.5
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
L Output Voltage VOL (V)
Operating Current vs. Temperature
(V+=6V,RT=33kΩ,CT=1000pF)
0
1
2
3
4
5
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Operating Current ICC (mA)
ICCAV
ICCLA
Standby Current vs. Temperature
(Standby Mode,V+=6V,VON/OFF=0V)
0
10
20
30
40
50
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Standby Current
ICCSTBY (μA)
NJM2382
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9
-
Ver.2012-07-26
MEMO
[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.
