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NJM2368
SWITCHING REGULATOR CONTROL IC FOR FLYBACK
GENERAL DESCRIPTION The NJM2368 is a high speed switching regulator control IC which can operate at low voltage. It uses a totempole output circuit , so that it can drive an external Bipolar Transistor directly. It is suitable for applications of flyback type switching regulation of up to 10W. PACKAGE OUTLINE
NJM2368D
NJM2368M
FEATURES Operating Voltage Wide Oscillator Range Soft-Start function. Under Voltage Lockouts Bipolar Technology Package Outline BLOCK DIAGRAM
(3.6V ~ 32V) (5kHz ~ 350 kHz) (U.V.L.O.) DIP8, DMP8, EMP8, SSOP8
NJM2368E
NJM2368V
REF 8
CT 7 30uA
CS 6
V+ 5
VREF
OSC L.O
U.V.LO 500 S.C.P 0.52V ERAMP PWM
PIN FUNCTION 1. IN2. F.B 3. GND 4. OUT 5. V+ 6. CS 7. CT 8. REF
1 IN
-
2 F.B
3 GND
4 OUT
Ver.2003-09-03
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NJM2368
ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL Input Voltage V+ Reference Output Current IOR Output Current IO Power Dissipation Operating Temperature Range Storage Temperature Range PD TOPR TSTG
MAXIMUM RATINGS 36 10 50 (DIP 8) 700 (DMP 8) 300 (EMP 8) 300 (SSOP 8) 250 -40 ~ +85 -50 ~ 125
UNIT V mA mA mW C C
RECOMMENDED OPERATING CONDITIONS (V+=6V, Ta=25C) PARAMETER SYMBOL RATINGS Operating Voltage V+ Feed Back Resistor RNF Oscillator Timing Capacitor CT Oscillator Timing Resistor RT Oscillate fOSC
MIN. 3.6 100 220 10 5
MAX. 32 - 22,000 100 350
UNIT V k pF k kHz
ELECTRICAL CHARACTERISTICS (V+=6V, RT=33k, CT=1,000pF, Ta=25C) REFERENCE VOLTAGE BLOCK PARAMETER SYMBOL Output Voltage Line Regulation Load Regulation OSCILLATOR BLOCK PARAMETER Oscillate Oscillate Fluctuations1 (Line Fluctuations) Oscillate Fluctuations2 (Temp Fluctuations) ERROR AMPLIFIER BLOCK PARAMETER Reference Voltage Input Bias Current Open Loop Gain Gain Band width Product Maximum Output Voltage (F.B Pin) Output Source Current (F.B Pin) VREF LINE LOAD
RATINGS IOR=1mA V+=3.6V ~ 32V, IOR=1mA IOR=0.1mA ~ 5.0mA
MIN. 2.45 - -
TYP. 2.50 6.8 5
MAX. 2.55 20.7 30
UNIT V mV mV
SYMBOL fosc fdv fdt
RATINGS CT=1,000pF, RT=33k V+=3.6V ~ 32V Ta=-40C ~ +85C
MIN. 85 - -
TYP. 105 1 5
MAX. 125 - -
UNIT kHz % %
SYMBOL VB IB AV GB VOM+ VOMIOM+
RATINGS
MIN. 0.51 - - - VREF-0.2 - 40
TYP. 0.52 5 90 0.6 - - 85
MAX. 0.53 100 - - - 200 200
UNIT V nA dB MHz V mV uA
RNF=100k RNF=100k VOM=1V
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Ver.2003-09-03
NJM2368
ELECTRICAL CHARACTERISTICS (V+=6V, RT=33k, CT=1,000pF, Ta=25C) PWM COMPARATE BLOCK PARAMETER Input Bias Voltage (F.B Pin) Input Threshold Voltage (F.B Pin) Maximum Duty Cycle
SYMBOL VTH0 VTH50 M
RATINGS dutycycle=0% dutycycle=50% F.B Pin=1.2V
MIN. - - 55
TYP. 0.55 0.87 64
MAX. 0.65 - 85
UNIT V V %
SOFT START CIRCUIT BLOCK PARAMETER SYMBOL Input Bias Current (CS Pin) Input Threshold Voltage (CS Pin) Input Threshold Voltage (CS Pin) IBCS VTHCS0
RATINGS
MIN. -
TYP. 250 0.25 0.52
MAX. 650 0.35 -
UNIT nA V V
dutycycle=0%
- -
VTHCS50 dutycycle=50%
SHORT CIRCUIT PROTECTION PARAMETER SYMBOL Input Threshold Voltage (F.B Pin) Charge Current (CS Pin) Latch mode Threshold Voltage (CS Pin) UNDER VOLTAGE LOCKOUT PARAMETER ON Threshold Voltage OFF Threshold Voltage Hysteresis Voltage OUTPUT PARAMETER H-Output Voltage (OUT Pin) L-Output Voltage (OUT Pin) Output Source Current (OUT Pin) GENERAL CHARACTERISTIC PARAMETER Quiescent Current Average Quiescent Current SYMBOL VOH VOL ISOURCE VTHPC ICHG VTHLA
RATINGS
MIN. 1.20
TYP. 1.50 30 1.50
MAX. 1.80 50 1.80
UNIT V uA V
CS Pin=0V, F.B Pin=2V
10 1.20
SYMBOL VTHON VTHOFF VHYS
RATINGS
MIN. - - 60
TYP. 2.70 2.52 180
MAX. - - -
UNIT V V mV
RATINGS RL=10k Output Sink Current =20mA OUT Pin=0V
MIN. 3.50 - 8
TYP. 4.00 0.25 11
MAX. - 0.65 -
UNIT V V mA
SYMBOL ICCLA ICCAV
RATINGS Latch Mode RL=, dutycycle=50%
MIN. - -
TYP. 1.6 3.5
MAX. 2.2 4.8
UNIT mA mA
Ver.2003-09-03
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NJM2368
TYPICAL APPLICATIONS
V
+
Rsf 330k RT 36k CT 1,000pF
Rsr Cs 180k 4.7uF
8
7 30uA
6
5
D1
VOUT +5V
VREF
OSC L.O
U.V.LO
500
CIN
0.52V ERAMP PWM
S.C.P
N1
N2
R2 22k
COUT
2k
1
2
3
4
CLP 2,200pF RNF 1M Q1 *100k
R1 2.2k
GND
GND
When Short Circuit Protection (SCP) is activated, Output terminal (Pin 4) becomes high impedance and the external switching transistor (Q1) is turned off. However, small leak current from Output terminal at high ambient temperature may turn on the external switching transistor causing malfunction of the SCP particularly when FET is used as a switching device. To avoid this issue, insert a 100k resistor between the Gate and the Source of the external transistor.
-4-
Ver.2003-09-03
NJM2368
TYPICAL CHARACTERISTICS
H Output Voltage vs. Source Current (V =6V, RT=33k, CT=1,000pF, OUT Pin=0V, Ta=25 C) 8 H Output Voltage VOH (V)
+ o
L Output Voltage vs. Sink Current 1 L Output Voltage VOL (V) 0.8 0.6 0.4 0.2 0 (V =6V, RT=33k, CT=1,000pF, Ta=25 C)
+ o
7 6 5 4 3 2 1 0 0 2 4 6 Source Current I 8 10 (mA) 12
0
10
SOURCE
20 30 40 50 (mA) Sink Current I SINK
60
Oscillator Frequency vs. Timing Resistor Oscillator Frequency fOSC (kHz) Oscillator Frequency fOSC (kHz) 1000 (V =6V, Ta=25 C)
+ o
Oscillator Frequency vs. Timing Capacitor 1000 (V+=6V, Ta=25oC)
100
CT=470pF
100 RT=10k 10 RT=33k RT=100k 1 10
10 CT=1,000pF 1 1 10 100 1000 Timing Resistor R (k) T 10000
100 1000 10000 Timing Capacitor C (pF) T
100000
Reference Voltage vs. Operating Voltage 2.52 Reference Voltage VREF (V) 2.51 2.5 2.49 2.48 (V =6V, Ta=25 C) Operating Current ICC (mA)
+ o
Operating Current vs. Operating Voltage 6 5 4 3 2 1 0 0 10 20 30 Operating Voltage V+ (V) 40 ICCLA (Ta=25oC) ICCAV
0
10 20 30 Operating Voltage V+ (V)
40
Ver.2003-09-03
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NJM2368
TYPICAL CHARACTERISTICS
Oscillator Frequency vs. Temperature Oscillator Frequency fOSC (kHz) 160 140 120 100 80 60 -50 (V =6V, RT=33k, CT=1,000pF) Referece Voltage VREF (V)
+
Referece Voltage vs. Temperature 3 2.8 2.6 2.4 2.2 2 -50 (V =6V, IOR=1mA)
+
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C) H Output Voltage vs. Temperature
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
L Output Voltage vs. Temperature (V =6V, ISINK =20mA, RT=33k, CT=1,000pF) 0.5 L Output Voltage VOL (V) 0.4 0.3 0.2 0.1 0 -50
+
(V =6V, RL=10k, RT=33k, CT=1,000pF) 10 H Output Voltage VOH (V) 8 6 4 2 0 -50
+
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
Quiescent Current vs. Temperature (Latch Mode, V =6V, RT=33k, CT=1,000pF) 2 1.8 1.6 1.4 1.2 1 -50
+ +
Average Quiescent Current vs. Temperature , (V =6V, RL= duty cycle=50%, RT=33k, CT=1,000pF) 5 Average Quiescent Current I (mA) 4 3 2 1 0 -50
Quiescent Current I (mA)
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
CCAV
CCLA
-25 0 25 50 75 100 125 o Ambient Temperature Ta ( C)
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Ver.2003-09-03
NJM2368
TYPICAL CHARACTERISTICS
Maximum Duty Cycle vs. Oscillator Frequency 80 Maximum Duty Cycle M (%) 70 60 50 40 30 20 10 0 10 100 1000 Oscillator Frequency OSC (kHz) f
Duty Cycle vs. CS Pin Voltage 80 70 Duty Cycle (%) 60 50 40 30 20 10 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 CS Pin Voltage VTHCS (V) (V =6V, Ta=25 C)
+ o
(V+=6V, Ta=25oC)
[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.
Ver.2003-09-03
-7-

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