Modulating Regulator. XR-3524 Datasheet

XR-3524 Regulator. Datasheet pdf. Equivalent


Exar XR-3524
XR-1S24/2S24/3S24
Pulse-Width Modulating Regulator
GENERAL DESCRIPTION
The XR-1524 family of monolithic integrated circuits
contain all the control circuitry for a regulating power
supply inverter or switching regulator. Included in a 16-
pin dual-in-line package is the voltage reference, error-
amplifier, oscillator, pulse width modulator, pulse steer-
ing flip-flop, dual alternating output switches and cur-
rent limiting and shut-down circuitry. This device can be
used for switching regulators of either polarity, trans-
former coupled DC to DC converters, transformerless
voltage doublers and polarity converters, as well as
other power control applications. The XR-1524 is speci-
fied for operation over the full military temperature
range of - 55°C to + 125°C, while the XR-2524 and XR-
3524 are designed for commercial applications of O°C
to + 70°C.
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Direct Replacement for SG-1524/2524/3524
Complete PWM power control circuitry
Single ended or push-pull outputs
Line and load regulation of 0.2%
1% maximum temperature variation
Total supply current less than 10 mA
Operation beyond 100 kHz
APPLICATIONS
Switching Regulators
Pulse-width Modulated Power Control Systems
ORDERING INFORMATION
Part Number
XR-1524M
XR-2524N
XR-2524P
XR-3524N
XR-3524P
Package
Ceramic
Ceramic
Plastic
Ceramic
Plastic
Operating Temperature
-55°C to + 125°C
O°C to +70°C
O°C to + 70°C
O°C to + 70°C
O°C to + 70°C
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Output Current (each output)
Reference Output Current
Oscillator Charging Current
Power Dissipation
Ceramic Packaqe
Derate above + 25°C
Plastic Package
Derate above + 25°C
Operating Temperature Range
XR-1524
XR-2524/XR-3524
Storage Temperature Range
40V
100 mA
50 mA
5 mA
1000 mW
8 mW/oC
625 mW/oC
5 mW/oC
- 55°C to + 125°C
O°C to + 70°C
-65°C to + 150°C
SYSTEM DESCRIPTION
The XR-1524/2524/3524 pulse width modulating regula-
tor is a complete monolithic switching regulator. An in-
ternal 5V reference, capable of supplying up to 50 mA
to external loads, provides an on board operating stan-
dard. The oscillator frequency and duty cycle are ad-
justed by an external RC network. Regulation is con-
trolled by an error amplifier which, combined with the
sense amplifier, also allows current limiting and remote
shutdown functions. The outputs of the XR-1524/25241
3524 are two identical NPN transistors with both emit-
ters and collectors uncommitted. Each output transis-
tor has antisaturation circuitry for fast response and lo-
cal current limiting set at 100 mAo
5-132


XR-3524 Datasheet
Recommendation XR-3524 Datasheet
Part XR-3524
Description Pulse-Width Modulating Regulator
Feature XR-3524; XR-1S24/2S24/3S24 Pulse-Width Modulating Regulator GENERAL DESCRIPTION The XR-1524 family of monol.
Manufacture Exar
Datasheet
Download XR-3524 Datasheet




Exar XR-3524
XR·15/25/3524
ELECTRICAL SPECIFICATIONS
Test Conditions: TA = - 55°C to + 125°C for the XR-1524 and O°C to + 70°C for the XR-2524 and XR-3524, VIN =
20V, and f = 20 kHz, unless specified otherwise.
XR-15241
XR-2524
XR-3524
PARAMETERS
MIN TYP MAX MIN TYP MAX UNITS
CONDITIONS
REFERENCE SECTION
Output Voltage
Line Regulation
Load Regulation
Ripple Rejection
Short Circuit Current Limit
Temperature Stability
Long Term Stability
4.8 5.0 5.2
10 20
20 50
66
100
0.3 1
20
4.6 5.0 5.4 V
10 30 mV VIN = 8 to 40 Volts
20 50 mV IL = 0 to 20 mA
66 dB f = 120 Hz, TA = 25°C
100 mA VREF = 0, TA = 25°C
0.3 1
% Over Operating Temperature Range
20 mV/khr TA = 25°C
OSCILLATOR SECTION
Maximum Frequency
Initial Accuracy
Voltage Stability
Temperature Stability
Output Amplitude
Output Pulse Width
300
5
1
2
3.5
0.5
300
5
1
2
3.5
0.5
kHz CT = .001 ,.,.F, RT = 2 KO
% RT and CT constant
% VIN = 8 to 40 Volts, TA = 25°C
% Over Operating Temperature Range
V Pin3, TA = 25°C
,.,.S CT = .01 mfd, TA = 25°C
ERROR AMPLIFIED SECTION
Input Offset Current
22
Input Offset Voltage
0.5 5
2 10
Input Bias Current
2 10
2 10
Open Loop Voltage Gain
72 80
60 80
Common Mode Voltage
1.8 3.4 1.8 3.4
Common Mode Rejection Ratio
70
70
Small Signal Bandwidth
33
Output Voltage
0.5 3.8 0.5 3.8
/-LA
mV
/-LA
dB
V
dB
MHz
V
VCM - 2.5 Volts
VCM = 2.5 Volts
TA = 25°C
TA = 25°C
AV - OdB, TA = 25°C
TA = 25°C
COMPARATOR SECTION
Duty Cycle
Input Threshold
Input Threshold
Input Bias Current
0 45
1
3.5
1
0 45
1
3.5
1
% % Each Output On
V Zero Duty Cycle
V Max. Duty Cycle
,.,.A
CURRENT LIMITING SECTION
Sense Voltage
Sense Voltage Temp. Coet.
Common Mode Voltage
Pin 9 = 2V with Error Amplifier
190 200 210 180 200 220 mV Set for Max. Out, TA = 25°C
0.2 0.2 mY/DC
-1 +1 -1 +1 V
OUTPUT SECTION (Each Output)
Max. Collector-Emitter Voltage 40
40
Collector Leakage Current
0.1 50
0.1 50
Saturation Voltage
12
12
Emitter Output Voltage
17 18
17 18
Rise Time
0.2 0.2
Fall Time
0.1 0.1
V
JlA VCE = 40V
V IC = 50 mA
V VIN = 20V
,.,.S RC = 2 KO, TA = 25°C
,.,.S RC = 2 KO, TA = 25°C
TOTAL STANDBY CURRENT
(Excluding oscillator charging
current, error and current limit
dividers, and with outputs
open)
8 10
8 10 mA VIN = 40V
5-133



Exar XR-3524
XR·15/25/3524
OPEN LOOP TEST CIRCUIT
2k
r-----------------------------------------------------~IW
L.--<';~-i 15
:~ t----+-~:J OUTPUTS
3 XR-1524
11
16 14
V1N
8-40V
0.1
2k
DESCRIPTION OF CIRCUIT OPERATION
VOLTAGE REFERENCE SECTION
The internal voltage reference and regulator section
provides a 5-volt reference output at pin 16. This volt-
age also serves as a regulated voltage source for the
internal timing and control circuitry. This regulator may
be bypassed for operation from a fixed 5-volt supply by
connecting pins 15 and 16 together to the input voltage.
In this configuration, the maximum input voltage is 6.0
volts.
This reference regulator may be used as a 5-volt source
for other circuitry. It will provide up to 50 mA of current
itself and can easily be expanded to higher currents
with an external PNP as shown in Figure 2.
ILTOIOA
DEPENDING
ON CHOICE
] FOR 01
Figure 2. Using the Internal Regulator as 5V Power Supply
for External Circuitry
+5V TO ALL
INTERNAL CIRCUITRY
INV. INPUT 1
(SUGBRSOTURNADTE
~
IB
Ik
10>--"'M. . . . .- C
SHUT DOWN
9 COMPENSATION
-:-
Figure 1. Detailed System Block Diagram of XR-1524
5-134
SENSE
C~







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