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 2 3 4
8 7 6 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+ 8
VREF 7
CT 6
OUT 5
VREF
OSC
ERROR AMP 1V PWM CURRENT SENSE AMP 0.15V
1 IN1
2 IN2
3 F.B
4 GND
■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
UNIT V mA mW °C °C
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C) PARAMETER Supply Voltage Oscillation Frequency Oscillator Timing Resistance SYMBOL V+ fosc RT MIN. 3.6 20 20 MAX. 32 500 100 UNIT V kHz kΩ
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NJM2340
■ELECTRICAL CHARACTERISTICS (V+=12V,Ta=25°C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL TEST CONDITION Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillation Frequency VREF LINE LOAD IOR=1mA V =3.6 ∼ 32V, IOR=1mA IOR=0.1 ∼ 5.0mA
+
MIN. 1.98 – –
TYP. 2.00 4.0 6.0
MAX. 2.02 20 40
UNIT V mV mV
SYMBOL fOSC
TEST CONDITION RT=27kΩ, CT=220pF
MIN. 315
TYP. 350
MAX. 385
UNIT kHz
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 VB 1 IB1 VOM+1 VOM-1 IOM1
TEST CONDITION
MIN. 144 – – 0.6 40
TYP. 150 20 VREF -0.15 0.75 85
MAX. 156 100 – 0.9 200
UNIT mV nA V V µA
RNF=100kΩ RNF=100kΩ VOM1=0.5V
SYMBOL VB 2 IB2 VOM+2 VOM-2 IOM2
TEST CONDITION
MIN. 0.985 – – 0.6 40
TYP. 1.000 20 VREF -0.15 0.75 85
MAX. 1.015 100 – 0.9 200
UNIT V nA V V µA
RNF=100kΩ RNF=100kΩ VOM2=0.5V
SYMBOL VTH0 VTH100
TEST CONDITION duty·cycle=0% (note) duty·cycle=100% (note)
MIN. VOM–
TYP. 1.0 1.4
MAX. 1.1 –
UNIT V V
SYMBOL VOL
TEST CONDITION ISINK=10mA
MIN. –
TYP. 0.5
MAX. 0.7
UNIT V
SYMBOL ICCAV
TEST CONDITION RL=∞, duty·cycle=50%
MIN. –
TYP. 1.5
MAX. 2.0
UNIT mA
(note) Duty·Cycle is defined as follows: Duty·Cycle=0%: IC output transistor is OFF. Duty·Cycle=100%: IC output transistor is ON.
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NJM2340
■TYPICAL APPLICATION
VIN Q1 RT 27kΩ CT 220pF RBE V+ VREF CT OUT RBC
5
L
VOUT
8
7
6
VREF
OSC
ERROR AMP 1V
R2
PWM CURRENT SENSE AMP
CIN
D1
COUT
0.15V
1
2
3
4
IN1
IN2 CNF2
F.B RNF2 RNF1
GND
R1
GNDIN
CNF1
RSC RCIN
GNDOUT
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NJM2340
■TIPICAL CHARACTERISTICS
Oscillator Frequency vs. Timing Resistor (V+=12V,Ta=25°C) CT=100pF CT=220pF
Oscillator Frequency vs. Timing Capacitor (V+=12V,Ta=25°C)
1000
1000 Oscillator Frequency f OSC (kHz)
Osillator Frequency f OSC (kHz)
RT=47kΩ 100
100
CT=1000pF CT=4700pF
RT=20kΩ
10 10 Timing Resistor RT (kΩ)
Reference Voltage vs. Output Current (V+=12V,Ta=25°C)
L Output Voltage VOL (V)
10
RT=100kΩ 10 100 1000 Timing Capacitor CT (pF)
L Output Voltage vs. Source Current (V+=12V,Ta=25°C)
100
10000
Reference Voltage VREF (V)
2.5 2 1.5 1 0.5 0 0
0.8 0.6 0.4 0.2 0
5
10
15
20
25
30
0
3
6
9
12
15
Output Current IOR (mA)
Source Current ISOURCE (mA)
Average Quiescent Current ICC (mA)
3 2.5 2 1.5 1 0.5 0 0
Average Quiescent Current (RL= ∞ ,duty·cycle=50%,Ta=25°C)
10
20 電源電圧 V+ (V)
30
40
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NJM2340
■TIPICAL CHARACTERISTICS
Oscillation Frequency vs. Temperature (V+=12V,RT=27kΩ,CT=220pF)
400 Oscillation Frequency f OSC (kHz) 380 360 340 320 300
Input Threshold Voltage (V)
2 1.6 1.2 0.8 0.4 0
Input Threshold Voltage vs. Temperature (V+=12V) VTH100
VTH0
-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)
0.5 L Output Voltage VOL (V) 0.4 0.3 0.2 0.1 0
L Level Output Voltage vs. Temperaure (V+=12V,ISINK=10mA)
3 Average Quisent Current ICCAV (mA) 2.5 2 1.5 1 0.5 0
Average Quisent Current vs. Temperature (V+=12V,RL= ∞ ,duty·cycle=50%)
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
Reference Voltage 1,2 vs. Temperaure (V+=12V) V B1
Ambient Temperature Ta (°C)
153 Reference Voltage1 VB1 (mV) 152 151 150 149 148 147
1.03 Reference Voltage2 VB2 (V)
[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.
1.02 1.01 1
V B2
0.99 0.98
0.97 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (°C)
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