NJM2367
Ver 2.1
- 1 -
5.5A HIGH POWER DC/DC CONVERTER CONTROLLER IC
s
GENERAL DESCRIPTION
sPACKAGE OUTLINE
s
FEATURES
q
Operating Voltage (7.5V to 40V)
q
PWM form Switching Power Supply Control
q
Internal High Power Transistor 5.5A (min.)
q
Fixed Frequency Oscillator 72kHz (typ.)
q
Internal Current Sense Amplifier
q
Internal Under Voltage Lockout
q
Internal Thermal Shutdown Circuit
q
Bipolar Technology
q
Package Outline
TO-22O(5PIN)
s
BLOCK DIAGRAM
Oscillator
Thermal
Under Voltage
Standby Circuit
Error Amplifier
PWM Comparator
5.5A Power Transistor
Current Sense
Ratch Circuit
S Q
R
5
4
3
2
1
ON/OFF
Reference
VREF
VREF
Current Circh Transistor
Shutdown
Lockout
Voltage
Amplifier
The
NJM2367
is a high power DC/DC converter controller
inducing basic function of DC/DC converter controller, which
consists precision reference voltage, fixed frequency
oscillator, high gain error amplifier, precision output switch,
cycle-by-cycle current limit, under voltage lockout, and
thermal shutdown circuit.
The
NJM2367
is suitable for step-down converter with few
external parts, and realize low power stand-by mode.
PIN FUNCTION
1:V
FB
2:SW
OUT
3:GND
4:V
+
5:STBY (V
COMP
)
1 2 3 4 5
NJM2367TA2050 NJM2367TLA2050
NJM2367
- 2 -
s
ABSOLUTE MAXIMUM RATINGS (Ta=25C
)
PARAMETER SYMBOL
RATINGS
UNIT
Maximum Supply Voltage
V
+
40 V
Switch Output Voltage
Vo
(SWITCH)
-0.5
+Vin
V
Voltage Feedback and
Compensation Input Voltage Range
V
FB
,V
COMP
-0.3
+7.0
V
Power Dissipation
P
D
TO-220 (5PIN)
16(T
C
46C)
W
Operating Junction Temperature
Tj
-40
+150
C
Operating Temperature Range
Topr
-40
+85
C
Storage Temperature Range
Tstg
-50
+150
C
s
THERMAL CHARACTERISTICS
Junction-to-Ambient Temperature
ja 70
Thermal
Resistance
Junction-to-Case
jc 6.5
C/W
s
POWER DISSIPATION vs. AMBIENT TEMPERATURE
(T
opr
=-40~+85C, Tj= ~+150C, P
D
=16W(T
C
46C))
0
2
4
6
8
10
12
14
16
18
25
50
75
100
Ambient Temperature Ta (C)
Power Dissipation
P
D
(W)
Heat Sink
HS
=10C/W
HS
=5C/W
HS
=20C/W
Without Heat Sink
NJM2367
- 3 -
s
ELECTRICAL CHARACTERISTICS (V
+
=12V, Ta=25C)
OSCILLATOR BLOCK
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Frequency fosc
V
+
=7.5V
65 72 79 kHz
ERROR AMPLIFIER BLOCK
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Voltage Feedback
Input Threshold
V
FB
(th)
4.9 5.0 5.1 V
Line Regulation
REGLine V
+
=7.5
40V
0.03
0.08
%/V
Input Bias Current
I
B
V
FB
=V
FB
(th)+0.15V
0.15
1.0
A
Ripple Rejection
PSRR
V
+
=10
20V
80 dB
Output Voltage Swing
V
OH
V
OL
Isource=75A,V
FB
=4.7V
Isink=0.4mA,V
FB
=5.3V
4.2
4.9
1.6
1.9
V
V
PWM COMPARATOR BLOCK
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Duty Cycle
Maximum
Minimum
DC
(MAX)
DC
(MIN)
V
FB
=0V
V
FB
=5.3V
0
95
0
0
%
%
SWITCH OUTPUT BLOCK
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Output Voltage Saturation
V
SAT
V
+
=7.5V,Isource=5.5A
V
+
-1.5 V
+
-1.8 V
OFF-State Leakage
Isw
(off)
V
+
=40V,SW
OUT
=0V
0
100
A
Current Limit Threshold
Ipk
(SWITCH)
V
+
=7.5V
5.5 6.5 8.0 A
Switching Times
Output Voltage Rise Time
Output Voltage Fall Time
tr
tf
V
+
=40V,R
OUT
=7.7,V
FB
=0V
V
+
=40V,R
OUT
=7.7,V
FB
=0V
100
50
nS
nS
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Startup Threshold
V
TH(UVLO)
V
+
Increasing
5.9 6.3 6.7 V
Hysteresis V
H(UVLO)
V
+
Decreasing
0.6 0.8 1.0 V
TOTAL DEVICE
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Standby-State
Power Supply Current
Icc
(stby)
STBY 0.1V
36
100
A
Operating-State
Power Supply Current
Icc V
+
=40V,V
FB
=0V
dutycycle=MAX
40 53 mA
Keep the limit of maximum power dissipation not to operate thermal shutdown.
Low duty cycle pulse test is used to close its junction temperature to ambient temperature.
NJM2367
- 4 -
s
TIPICAL CHARACTERISTICS
Standby-State Power Supply Curret vs.
Supply Voltage (Ta=25C)
0
30
60
90
120
150
0
5
10 15 20 25 30 35 40
Supply Voltage V
+
(V)
Standby-State Power Supply
Current I
CC(stby)
(
A)
Duty Cycle vs. Compensation Voltage
(V
+
=12V,Ta=25C)
0
20
40
60
80
100
0
1
2
3
4
5
Compensation Voltage V
COMP
(V)
Duty Cycle DC (%)
Switch Output Saturation Voltage vs.
Output Source Current (V
+
=7.5V,Ta=25)
-3
-2.5
-2
-1.5
-1
-0.5
0
0
2
4
6
8
10
Output Source Current I
SOURCE
(A)
Switch Output Saturation
Voltage V
SAT
(V)
Error AMP Block Output Saturation Voltage
vs. Output Source Current
(V
+
=12V,V
FB
=5.5V,Ta=25C)
0
0.4
0.8
1.2
1.6
2
0
0.4
0.8
1.2
1.6
2
Output Sink Current I
SINK
(mA)
Output Saturation Voltage
V
SAT(ERROR)
(V)
NJM2367
- 5 -
s
TIPICAL CHARACTERISTICS
Voltage Feedback Input Threshold vs.
Temperature (V
+
=12V)
4.9
4.95
5
5.05
5.1
-50 -25
0
25 50 75 100 125 150
Ambient Temperature Ta (C)
Voltage Feedback Input
Threshold V
FB
(V)
Error AMP Block Input Bias Current vs.
Temperaure (V
+
=12V,V
FB
=V
FB
(th)+0.15V)
0
0.1
0.2
0.3
0.4
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
Input Bias Current I
B
(
A)
Oscillator Frequency vs. Temperature
(V
+
=12V)
60
65
70
75
80
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
Oscillator Frequency
f
OSC
(kHz)
Current Limit Threshold vs. Temperature
(V
+
=7.5V)
5
6
7
8
9
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
Current Limit Threshold
Ipk
(SWITCH)
(A)
Operating-State
Power Supply Current vs. Temperature
(V
+
=40V,V
FB
=0V,Dudy Cycle=MAX)
0
10
20
30
40
50
60
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
Power Supply Current
I
CC
(mA)
Under Voltage Lockout Threshold
vs. Temperature
4
5
6
7
8
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
Under Voltage Lockout Threshold
V
TH(UVLO)
(V)
Startup Threshold
V
+
Decreasing
Startup Threshold
V
+
Increasing
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