NJM3524
SWITCHING REGULATOR CONTROL CIRCUIT
■
GENERAL DESCRIPTION
■
PACKAGE OUTLINE
The
NJM3524
of regulating pulse width modulators contains all of the
control circuitry necessary to implement switching regulators of either
polarity converters and voltage doublers, as well as other power control
applications. This device includes a 5V voltage regulator capable of
supplying up to 50mA to external circuitry a control amplifier, an oscillator,
a pulse width modulator, a phase splitting flip-flop, dual alternating output
NJM3524D
NJM3524M
switch transistors, and current limiting and shut-down circuitry. Both the
regulator output transistor and each output switch are internally current
limited and, to limit junction temperature, an internal thermal shut-down
circuit is employed.
NJM3524V
■
FEATURES
•
Operating Voltage
(8V to 40V)
•
Complete PWM Power Control Circuitry
•
Uncommitted Outputs for Single-Ended or Pash-Pull Appli Cutions
•
Low Stand by Current
•
Package Outline
DIP16, DMP16, SSOP16
•
Bipolar Technology
■
RECOMMEND OPERATING CONDITION
Parameter
Symbol
+
Operating Voltage
V
Output Reference Current
I
REF
Timing Resistance
R
T
Timing Capacitor
C
T
Operating Temperature Range
T
opr
Min.
8
0
1.8
-20
Typ.
20
-
-
-
25
Max.
40
50
100
0.1
75
Unit
V
mA
kΩ
µF
°C
■
PIN CONFIGURATION
■
EQUIVALENT CIRCUIT
Ver.2003-07-18
-1-
NJM3524
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Output Current
Output Reference Current
Power Dissipation
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
+
(T
a
= 25ºC)
RATINGS
40
100
50
(DIP16) 700
(DMP16) 300
-20 to + 75
-40 to +125
UNIT
V
mA
mA
mW
mW
ºC
ºC
I
O
I
REF
P
D
T
opr
T
stg
■
ELECTRICAL CHARACTERISTICS
Electrical characteristics over recommended operating free-air temperature range, V
+
= 20V, f = 20kHz
(unless otherwise noted).
Reference Section
PARAMETER
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Temperature Coefficient
Short Circuit Output Current
SYMBOL
V
REF
∆V
REF
-V
RR
T. C.
I
REF S
+
TEST CONDITION
V = 20v
V = 8 to 40V
+
+
+
+
MIN.
4.6
-
-
-
-
-
TYP.
5.0
10
20
66
-1
100
MAX.
5.4
30
50
-
-
-
UNIT
V
mV
mV
dB
mV/°C
mA
∆V
REF
-I
REF
V = 10V, I
REF
= 0 to 20mA
V = 20V, f = 120Hz
Ta = -20 to +75°C
Error Amplifier Section
Input Offset Voltage
Input Bias Current
Open Loop Voltage Gain
Input Common Mode Voltage Range
Common Mode Rejection Ratio
Unity Gain Bandwidth
Output Voltage Swing
V
IO
I
B
(1)
A
V
V
CM
CMR
-
-
T
a
= 25°C
V
IC
= 2.5V
V
IC
= 2.5V
-
-
60
1.8
-
-
0.5
2
2
80
-
70
3
-
10
10
-
3.4
-
-
3.8
mV
µA
dB
V
dB
MHz
V
Oscillator Section
Frequency
Frequency Change with Voltage
Frequency Change with Temperature
Output Pulse Width (Pin 3)
Output Amplitude (Pin 3)
f
OSC
-
-
-
-
C
T
= 0.01µF, R
T
= 2kΩ
V = 8 to 40V
T
a
= -20 to +75°C
C
T
= 0.01µF
+
-
-
-
-
-
30
-
-
0.5
3.5
-
1
3
-
-
kHz
%
%
µS
V
-2-
Ver.2003-07-18
NJM3524
Comparator Section
Maximum Duty Cycle
Input Threshold (Pin 9)
Input Threshold (Pin 9)
Input Bias Current
-
V
IH
V
IH
I
B
(2)
"0" duty cycle
"Max" duty cycle
0
-
-
-
-
1.0
3.5
1
45
-
-
-
%
V
V
µA
Current Limiting Section
Input Voltage Range
Sense Voltage
Sense Voltage Temperature Coefficient
-
-
-
V
(2)
- V
(1)
≥
50mV
-0.7
180
-
-
200
0.2
+1.0
220
-
V
mV
mV/°C
Output Section
Collector-Emitter Breakdown Voltage
Collector Leakage Current
Collector-Emitter Saturation Voltage
Emitter Output Voltage
Turn-off Voltage Rise Time
Turn-on Voltage Fall Time
V
CER
I
CER
V
CE(SAT)
-
T
r
T
I
V
CE
= 40V
I
O
= 50mA
V = 20V, I
F
= -250µA
R
C
= 2kΩ
R
C
= 2kΩ
+
40
-
-
17
-
-
-
0.1
1
18
0.2
0.1
-
50
2
-
-
-
V
µA
V
V
µS
µS
Total Device
Standby Current
I
Q
V+ = 40V, Pin
(2)
= 2V
1, 4, 7, 8, 9, 11, 14 = GND
All Other Inputs and Outputs Open
-
8
10
mA
■
BLOCK DIAGRAM
Ver.2003-07-18
-3-
NJM3524
■
ERROR AMPLIFIER BIAS CIRCUITS
(A) Positive Output
(B) Negative Output
V
O
=
V
REF
R
2
⋅ +
1
2
R
1
V
O
= -
V
REF
R
2
⋅
- 1
2
R
1
■
CURRENT LIMIT
(a) Take the detection output from the ground line side, because the input voltage range is -0.7V to +1.0V.
(b) The sensing voltage is 200mV typical.
1
R
2
I
O(MAX)
=
(V
SENSE
+
V
O
)
R
S
R
1
+
R
2
I
OS
=
V
SENSE
R
S
■
SOFT START METHOD
It is possible that the output stage is broken due to a wrong operation of circuits simultaneously when supply voltage
was applied. This failure can be prevented by setting the error amplifier output to a low level for a certain time as
shown in the right figure.
In this case, the soft start time is determined by the time constant of R
B
and C
B
.
■
OUTPUT CONFIGURATIONS
Capacitor-Diode-Coupled
Voltage Multiplier Output stage
■
TYPICAL APPLICATIONS
Single-Ended Inductor Circuit
Transformer-Coupled Outputs
Fig. 1 Capacitor-Diode Output Circuit
Fig. 2 Flyback Converter Circuit
Fig. 3 Push-Pull
Transformer-Coupled Circuit
Ver.2003-07-18
-4-
NJM3524
■
POWER DISSIPATION VS. AMBIENT TEMPERATURE
■
TYPICAL CHARACTERISTICS
Reference Voltage vs. Operating Voltage
Standby Current vs. Operating Voltage
Open Loop Voltage Gain vs. Frequency
R
T
, C
T
vs. Frequency
[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.2003-07-18
-5-
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