NJM2367
5.5A HIGH POWER DC/DC CONVERTER CONTROLLER IC
sGENERAL
DESCRIPTION
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.
sPACKAGE
OUTLINE
12345
NJM2367TA2050
sFEATURES
qOperating
Voltage
(7.5V to 40V)
qPWM
form Switching Power Supply Control
qInternal
High Power Transistor
5.5A (min.)
qFixed
Frequency Oscillator
72kHz (typ.)
qInternal
Current Sense Amplifier
qInternal
Under Voltage Lockout
qInternal
Thermal Shutdown Circuit
qBipolar
Technology
qPackage
Outline
TO-22O(5PIN)
NJM2367TLA2050
PIN FUNCTION
1:V
FB
2:SW
OUT
3:GND
4:V
+
5:STBY (V
COMP
)
sBLOCK
DIAGRAM
5.5A Power Transistor
Current Sense
Amplifier
Current Circh Transistor
4
2
Thermal
Shutdown
Reference
Voltage
ON/OFF
VREF
Oscillator
S
R
Ratch Circuit
Q
Under Voltage
Lockout
Standby Circuit
PWM Comparator
VREF
1
Error Amplifier
5
3
Ver 2.1
- 1 -
NJM2367
sABSOLUTE
MAXIMUM RATINGS (Ta=25°C )
PARAMETER
SYMBOL
Maximum Supply Voltage
V
+
Switch Output Voltage
Vo
(SWITCH)
Voltage Feedback and
V
FB
,V
COMP
Compensation Input Voltage Range
Power Dissipation
P
D
Operating Junction Temperature
Operating Temperature Range
Storage Temperature Range
Tj
Topr
Tstg
RATINGS
40
-0.5
∼
+Vin
-0.3
∼
+7.0
TO-220 (5PIN)
16(T
C
46°C)
-40
∼
+150
-40
∼
+85
-50
∼
+150
UNIT
V
V
V
W
°C
°C
°C
sTHERMAL
CHARACTERISTICS
Junction-to-Ambient Temperature
Thermal
Resistance
Junction-to-Case
θja
θjc
70
6.5
°C/W
sPOWER
DISSIPATION vs. AMBIENT TEMPERATURE
(T
opr
=-40~+85°C, Tj= ~+150°C, P
D
=16W(T
C
46°C))
18
16
Power Dissipation P
D
(W)
14
12
10
8
6
4
2
0
25
50
75
Ambient Temperature Ta (°C)
100
Without Heat Sink
θ
HS
=10°C/W
θ
HS
=5°C/W
Heat Sink
θ
HS
=20°C/W
-2-
NJM2367
sELECTRICAL
CHARACTERISTICS (V
+
=12V, Ta=25°C)
OSCILLATOR BLOCK
PARAMETER
Frequency
ERROR AMPLIFIER BLOCK
PARAMETER
Voltage Feedback
Input Threshold
Line Regulation
Input Bias Current
Ripple Rejection
Output Voltage Swing
SYMBOL
fosc
TEST CONDITIONS
V
+
=7.5V
MIN.
65
TYP.
72
MAX.
79
UNIT
kHz
SYMBOL
V
FB
(th)
REG·Line
I
B
PSRR
V
OH
V
OL
TEST CONDITIONS
MIN.
4.9
TYP.
5.0
0.03
0.15
80
4.9
1.6
MAX.
5.1
0.08
1.0
–
–
1.9
UNIT
V
%/V
μA
dB
V
V
V
+
=7.5
∼
40V
V
FB
=V
FB
(th)+0.15V
V
+
=10
∼
20V
Isource=75μA,V
FB
=4.7V
Isink=0.4mA,V
FB
=5.3V
–
–
–
4.2
–
PWM COMPARATOR BLOCK
PARAMETER
SYMBOL
Duty Cycle
Maximum
Minimum
SWITCH OUTPUT BLOCK
PARAMETER
Output Voltage Saturation
OFF-State Leakage
Current Limit Threshold
Switching Times
Output Voltage Rise Time
Output Voltage Fall Time
DC
(MAX)
DC
(MIN)
TEST CONDITIONS
V
FB
=0V
V
FB
=5.3V
MIN.
–
0
TYP.
95
0
MAX.
–
0
UNIT
%
%
SYMBOL
TEST CONDITIONS
MIN.
–
–
5.5
–
–
TYP.
V
+
-1.5
0
6.5
100
50
MAX.
V
+
-1.8
100
8.0
–
–
UNIT
V
μA
A
nS
nS
V
SAT
V
+
=7.5V,Isource=5.5A
Isw
(off)
V
+
=40V,SW
OUT
=0V
Ipk
(SWITCH)
V
+
=7.5V
tr
tf
V
+
=40V,R
OUT
=7.7Ω,V
FB
=0V
V
+
=40V,R
OUT
=7.7Ω,V
FB
=0V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER
SYMBOL
Startup Threshold
Hysteresis
TOTAL DEVICE
PARAMETER
V
TH(UVLO)
V
H(UVLO)
TEST CONDITIONS
V
+
Increasing
V
+
Decreasing
MIN.
5.9
0.6
TYP.
6.3
0.8
MAX.
6.7
1.0
UNIT
V
V
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
μA
mA
Standby-State
Icc
(stby)
STBY 0.1V
–
36
100
Power Supply Current
Operating-State
Icc
V
+
=40V,V
FB
=0V
–
40
53
Power Supply Current
duty·cycle=MAX
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.
-3-
NJM2367
sTIPICAL
CHARACTERISTICS
Switch Output Saturation Voltage vs.
+
Output Source Current (V =7.5V,Ta=25℃)
Output Saturation Voltage
V
SAT(ERROR)
(V)
Error AMP Block Output Saturation Voltage
vs. Output Source Current
+
(V =12V,V
FB
=5.5V,Ta=25°C)
0
Switch Output Saturation
Voltage V
SAT
(V)
-0.5
-1
-1.5
-2
-2.5
-3
2
1.6
1.2
0.8
0.4
0
0
2
4
6
8
10
Output Source Current I
SOURCE
(A)
0
0.4
0.8
1.2
1.6
Output Sink Current I
SINK
(mA)
Duty Cycle vs. Compensation Voltage
+
(V =12V,Ta=25°C)
2
Standby-State Power Supply
Current I
CC(stby)
(μA)
150
120
90
60
30
0
Standby-State Power Supply Curret vs.
Supply Voltage (Ta=25°C)
100
Duty Cycle DC (%)
80
60
40
20
0
0
5
10 15 20 25 30 35
+
Supply Voltage V (V)
40
0
1
2
3
4
5
Compensation Voltage V
COMP
(V)
-4-
NJM2367
sTIPICAL
CHARACTERISTICS
Voltage Feedback Input Threshold vs.
+
Temperature (V =12V)
Input Bias Current I
B
(μA)
Error AMP Block Input Bias Current vs.
+
Temperaure (V =12V,V
FB
=V
FB
(th)+0.15V)
5.1
Voltage Feedback Input
Threshold V
FB
(V)
5.05
5
4.95
4.9
0.4
0.3
0.2
0.1
0
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
Oscillator Frequency vs. Temperature
+
(V =12V)
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (°C)
Current Limit Threshold vs. Temperature
+
(V =7.5V)
80
Oscillator Frequency
f
OSC
(kHz)
75
70
65
60
9
Current Limit Threshold
Ipk
(SWITCH)
(A)
8
7
6
5
-50 -25
0
25
50
75 100 125 150
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
Under Voltage Lockout Threshold
vs. Temperature
60
Power Supply Current
I
CC
(mA)
7
Startup Threshold
V
+
Increasing
Ambient Temperature Ta (°C)
Operating-State
Power Supply Current vs. Temperature
+
(V =40V,V
FB
=0V,Dudy Cycle=MAX)
Under Voltage Lockout Threshold
V
TH(UVLO)
(V)
8
50
40
30
20
10
0
6
5
Startup Threshold
V
+
Decreasing
4
-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)
-5-
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