NJM2369
SWITCHING REGULATOR CONTROL IC FOR FLYBACK
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
The NJM2369 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 power MOS-FET directly.
It is suitable for applications of flyback type switching
regulation of up to 10W.
■FEATURES
● Operating Voltage
● Wide Oscillator Range
● Soft-Start function.
● Under Voltage Lockouts
● Bipolar Technology
● Package Outline
(3.6V ~ 32V)
(5kHz ~ 350 kHz)
NJM2369D
NJM2369M
NJM2369E
NJM2369V
(U.V.L.O.)
DIP8, DMP8, EMP8, SSOP8
■BLOCK DIAGRAM
REF
CT
8
7
CS
V+
6
5
30uA
VREF
PIN FUNCTION
1. IN2. F.B
3. GND
4. OUT
5. V+
6. CS
7. CT
8. REF
OSC
L.O
U.V.LO
S.C.P
ER⋅AMP
0.52V
PWM
1
IN-
Ver.2004-06-03
2
F.B
3
GND
4
OUT
-1-
NJM2369
■ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Input Voltage
V+
Reference Output Current
IOR
Power Dissipation
PD
Operating Temperature Range
Storage Temperature Range
TOPR
TSTG
MAXIMUM RATINGS
36
10
(DIP 8)
700
(DMP 8)
300
(EMP 8)
300
(SSOP 8)
250
-40 ~ +85
-50 ~ 125
■RECOMMENDED OPERATING CONDITIONS (V+=6V, Ta=25°C)
PARAMETER
SYMBOL
RATINGS
Operating Voltage
V+
Feed Back Resistor
RNF
Oscillator Timing Capacitor
CT
Oscillator Timing Resistor
RT
Oscillate
fOSC
UNIT
V
mA
mW
°C
°C
MIN.
3.6
100
220
10
5
MAX.
32
–
22,000
100
350
UNIT
V
kΩ
pF
kΩ
kHz
■ELECTRICAL CHARACTERISTICS (V+=6V, RT=33kΩ, CT=1,000pF, Ta=25°C)
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)
-2-
MIN.
TYP.
MAX.
UNIT
2.45
–
–
2.50
6.8
5
2.55
20.7
30
V
mV
mV
MIN.
TYP.
MAX.
UNIT
CT=1,000pF, RT=33kΩ
85
105
125
kHz
fdv
V+=3.6V ~ 32V
–
1
–
%
fdt
Ta=-40°C ~ +85°C
–
5
–
%
MIN.
TYP.
MAX.
UNIT
0.51
–
–
–
VREF-0.2
–
0.52
5
90
0.6
–
–
0.53
100
–
–
–
200
V
nA
dB
MHz
V
mV
40
85
200
uA
VREF
LINE
LOAD
RATINGS
IOR=1mA
V+=3.6V ~ 32V, IOR=1mA
IOR=0.1mA ~ 5.0mA
SYMBOL
fosc
RATINGS
SYMBOL
RATINGS
VB
IB
AV
GB
VOM+
VOM-
RNF=100kΩ
RNF=100kΩ
IOM+
VOM=1V
Ver.2004-06-03
NJM2369
■ELECTRICAL CHARACTERISTICS (V+=6V, RT=33kΩ, CT=1,000pF, Ta=25°C)
PWM COMPARATE BLOCK
PARAMETER
Input Threshold Voltage
(F.B Pin)
Input Threshold Voltage
(F.B Pin)
Maximum Duty Cycle
SYMBOL
UNDER VOLTAGE LOCKOUT
PARAMETER
ON Threshold Voltage
OFF Threshold Voltage
Hysteresis Voltage
TYP.
MAX.
UNIT
duty·cycle=0%
–
0.55
0.65
V
VTH50
duty·cycle=50%
–
0.87
–
V
F.B Pin=1.2V
55
64
85
%
MIN.
TYP.
MAX.
UNIT
–
250
650
nA
–
0.25
0.35
V
–
0.52
–
V
MIN.
TYP.
MAX.
UNIT
1.20
1.50
1.80
V
10
30
50
uA
1.20
1.50
1.80
V
MIN.
TYP.
MAX.
UNIT
–
–
60
2.70
2.52
180
–
–
–
V
V
mV
MIN.
TYP.
MAX.
UNIT
3.50
–
4.00
0.25
–
0.65
V
V
–
35
–
mA
MIN.
TYP.
MAX.
UNIT
–
–
1.6
5.2
2.2
10.0
mA
mA
αM
RATINGS
IBCS
VTHCS0
duty·cycle=0%
VTHCS50 duty·cycle=50%
SHORT CIRCUIT PROTECTION
PARAMETER
SYMBOL
Input Threshold Voltage
(F.B Pin)
Charge Current
(CS Pin)
Latch mode Threshold Voltage
(CS Pin)
MIN.
VTH0
SOFT START CIRCUIT BLOCK
PARAMETER
SYMBOL
Input Bias Current (CS Pin)
Input Threshold Voltage
(CS Pin)
Input Threshold Voltage
(CS Pin)
RATINGS
RATINGS
VTHPC
ICHG
CS Pin=0V, F.B Pin=2V
VTHLA
SYMBOL
RATINGS
VTHON
VTHOFF
VHYS
OUTPUT
PARAMETER
SYMBOL
H-Output Voltage (OUT Pin)
L-Output Voltage (OUT Pin)
Output Source Current
(OUT Pin)
VOH
VOL
GENERAL CHARACTERISTIC
PARAMETER
Quiescent Current
Average Quiescent Current
Ver.2004-06-03
ISOURCE
SYMBOL
ICCLA
ICCAV
RATINGS
RL=10kΩ
Output Sink Current =20mA
OUT Pin=0V
RATINGS
Latch Mode
RL=∞, duty·cycle=50%
-3-
NJM2369
■ TYPICAL APPLICATIONS
+
V
Rsf
330kΩ
Rsr
Cs
180kΩ 4.7uF
CT
1,000pF
RT
36kΩ
8
7
6
VOUT
+5V
D1
5
30uA
VREF
OSC
L.O
U.V.LO
CIN
N1
S.C.P
R2
22kΩ
N2
ER⋅AMP
0.52V
PWM
COUT
1
2
3
4
R1
2.2kΩ
CLP
2,200pF
GND
RNF
1MΩ
2kΩ
Q1
*100kΩ
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 100kΩ resistor between the Gate and the Source of the external transistor.
-4-
Ver.2004-06-03
NJM2369
■TYPICAL CHARACTERISTICS
H Output Voltage vs. Source Current
L Output Voltage vs. Sink Current
+
o
+
(V =6V, RT=33kΩ, CT=1,000pF, OUT Pin=0V, Ta=25 C)
8
6
5
4
3
2
1
0
1
L Output Voltage VOL (V)
H Output Voltage VOH (V)
7
0
10
20
30
Source Current ISOURCE (mA)
0.8
0.6
0.4
0.2
0
40
CT=470pF
100
10
CT=1,000pF
1
1
10
100
1000
Timing Resistor RT (kΩ)
RT=100kΩ
1
10
Operating Current ICC (mA)
Reference Voltage VREF (V)
Ver.2004-06-03
10
20
30
Operating Voltage V+ (V)
40
100000
(Ta=25oC)
6
2.49
100
1000
10000
Timing Capacitor CT (pF)
Operating Current vs. Operating Voltage
o
2.5
0
RT=33kΩ
10
10000
2.51
2.48
60
RT=10kΩ
(V =6V, Ta=25 C)
2.52
20
30
40
50
Sink Current ISINK (mA)
100
Reference Voltage vs. Operating Voltage
+
10
(V+=6V, Ta=25oC)
1000
Oscillator Frequency fOSC (kHz)
Oscillator Frequency fOSC (kHz)
o
(V =6V, Ta=25 C)
1000
0
Oscillator Frequency vs. Timing Capacitor
Oscillator Frequency vs. Timing Resistor
+
o
(V =6V, RT=33kΩ, CT=1,000pF, Ta=25 C)
ICCAV
5
4
3
ICCLA
2
1
0
0
10
20
30
Operating Voltage V+ (V)
40
-5-
NJM2369
■TYPICAL CHARACTERISTICS
Oscillator Frequency vs. Temperature
Referece Voltage vs. Temperature
+
140
120
100
80
60
-50
(V =6V, IOR=1mA)
3
Referece Voltage VREF (V)
160
Oscillator Frequency fOSC (kHz)
+
(V =6V, RT=33kΩ, CT=1,000pF)
2.8
2.6
2.4
2.2
2
-50
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
L Output Voltage vs. Temperature
H Output Voltage vs. Temperature
+
(V =6V, ISINK =20mA, RT=33kΩ, CT=1,000pF)
0.5
+
L Output Voltage VOL (V)
H Output Voltage VOH (V)
(V =6V, RL=10kΩ, RT=33kΩ, CT=1,000pF)
10
8
6
4
2
0
-50
0.2
0.1
Average Quiescent Current vs. Temperature
(V =6V, RL=∞, duty cycle=50%, RT=33kΩ, CT=1,000pF)
5
CCAV
1.6
1.4
1.2
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
+
Average Quiescent Current
I
(mA)
1.8
CCLA
Quiescent Current
I
(mA)
(Latch Mode, V =6V, RT=33kΩ, CT=1,000pF)
2
-6-
0.3
0
-50
Quiescent Current vs. Temperature
1
-50
0.4
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
+
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
4
3
2
1
0
-50
-25
0
25 50 75 100 125
o
Ambient Temperature Ta ( C)
Ver.2004-06-03
NJM2369
■TYPICAL CHARACTERISTICS
Maximum Duty Cycle vs. Oscillator Frequency
(V+=6V, Ta=25oC)
Maximum Duty Cycle αM (%)
80
70
60
50
40
30
20
10
0
10
100
1000
Oscillator Frequency OSC
f
(kHz)
Duty Cycle vs. CS Pin Voltage
+
o
(V =6V, Ta=25 C)
80
Duty Cycle α (%)
70
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)
[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.2004-06-03
-7-