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XR-2230 Datasheet Preview

XR-2230 Datasheet

Pulse-Width Modulator Control System

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XR-2230
Pulse-Width Modulator Control System
GENERAL DESCRIPTION
The XR-2230 is a high-performance monolithic pulse
width modulator control system. It contains all the nec-
essary control blocks for designing switch mode power
supplies, and other power control systems. Included in
the 18-Pin dual-in-line package are two error amplifiers,
a sawtooth generator, and the necessary control logic
to drive two open-collector power transistors. Also in-
cluded are protective features, such as adjustable
dead-time control, thermal shutdown, soft-start control,
and double-pulse protection circuitry.
The device provides two open-collector output transis-
tors which are driven 180° out-of-phase, and are capa-
ble of sinking 30 mA. These outputs can be used to im-
plement single-ended or push-pull switching regulation
of either polarity in transformerless or transformer-
coupled converters.
FUNCTIONAL BLOCK DIAGRAM
COMP1
VCC
DTADJ
GND
COMP2
SET
OSCILLATOR
OUTPUT
EXTERNAL
SHUTDOWN
PWM OUT
PWM IN
FEATURES
Thermal Shutdown
Adjustable Dead-time
Dual Open-Collector
30 mA Output Transistors
Double-Pulse Protection Circuit
Soft-Start Control
High-Speed Remote Shut-Down Input
Two High-Performance Error Amplifiers
with ± 5V Input Common-Mode Range
APPLICATIONS
Switching Regulators
Motor-Speed Controllers
Pulse-Width Modulated Control Systems
ABSOLUTE MAXIMUM RATINGS
Positive Supply Voltage
Negative Supply Voltage
Input Voltage
Output Voltage
Power Dissipation (TA S 25°C)
Operating Temperature
Storage Temperature
-0.5 to + 18V
+0.5 to -18V
-18 to + 18V
-0.5 to + 18V
400 mW
-10°C to +85°C
- 55°C to + 125°C
OUT1
OUT2
ORDERING INFORMATION
Part Number
XR-2230CP
Package
Plastic
Operating Temperature
O°C to + 70°C
SYSTEM DESCRIPTION
The XR-2230 PWM circuit contains two high-
performance error amplifiers with wide input common-
mode range, and large voltage gains. Typically, one am-
plifier (Pins 16, 17, 18) is used for current sensing and
the other (Pins 1, 2, 3) is used as an error amplifier to
sense the output voltage. The XR-2230 requires a split
supply between ± 8 volts and ± 15 volts, however, it
can be operated from a single supply with proper exter-
nal biasing on the ground pin and input pins of the error
amplifiers. The output drivers capable of sinking 30 mA
at a saturation voltage of about 0.3V can be used in a
push-pull configuration, or can be paralleled for a
single-ended configuration with a duty cycle between
0% to over 90%.
The XR-2230 features a self-protecting thermal-
shutdown circuitry which turns off the output drivers
when the junction temperature exceeds 130°C. The on-
board regulator stabilizes the oscillator frequency to
0.1 %N for reliable performance.
5-155




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XR-2230 Datasheet Preview

XR-2230 Datasheet

Pulse-Width Modulator Control System

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XR·2230
ELECTRICAL CHARACTERISTICS
Test Conditions: TA = 25°C, VCC = + 12V, VEE:::: -12V, fOSC = 20 kHz, unless otherwise specified.
SYMBOL
PARAMETERS
MIN TYP MAX UNIT CONDITIONS
SUPPLY SECTION
VCC
Positive Supply Voltage
VEE Negative Supply Voltage
ICC Positive Supply Current
lEE Negative Supply Current
+10
7.0
-2.0
11.0
-6.0
-10
15.0
-2.0
V
V
rnA
rnA
OSCILLATOR SECTION
fOSC
Frequency Range
Initial Accuracy
VOSC
0
Supply Voltage Stability
Low Supply Voltage
Temperature Stability
Sawtooth Peak Voltage
Duty Cycle Range
10
-20
3.0
10
0.1
0.01
3.5
100 kHz
15 % RT :::: 30 kO,
CT :::: 4700 pF
%N VCC :::: + 10V :::z + 15V
+20 % VCC :::: + 18V, VEE:::: -8V
%IOC
4.0 V
90 % fOSC:::: 20 kHz
VOLTAGE ERROR AMPLIFIER
VOS Input Offset Voltage
IBIAS
Input Bias Current
AVO Open-Loop Gain
f-3dB
Closed-Loop Bandwidth
CMMR
Common-Mode Rejection
Ratio
YOM
Output Voltage Swing
SR Slew Rate
Input Voltage Range
2 10 mV
-.5 -30
,.,.A
60 90
dB
25 kHz AVCL:::: 40 dB
60 dB VICM:::: ±4.5V
±5
24
±5
V RL :::: 10 kO
VCC :::: +8V, VEE :::: -8V
V/,.,.s AVCL = 14 dB,
RF :::: 10 kO
V
CURRENT ERROR AMPLIFIER
VOS
Input Offset Voltage
IBIAS
AVO
Input Bias Current
Open-Loop Gain
f-3 dB
CMRR
Closed-Loop Bandwidth
Common-Mode Rejection
Ratio
YOM
Output Voltage Swing
SR Slew Rate
Input Voltage Range
4 20 mV
-1.0 -60
,.,.A
60 90
dB
25 kHz AVCL :::: 40 dB
60 90
dB VICM = ±4.5V
±5
±4
48
±5
V
V
V/,.,.s
V
RL :::: 10 kO
VCC :::: +8V, VEE :::: -8V
AACL :::: 14 dB,
RF :::: 10 kO
MODULATOR SECTION
Set Input Open Voltage
(Pin 15)
Modin Input Open Voltage
(Pin 11)
Inhibit Input Current (Pin 13)
td Inhibit Propagation Delay
Out1, Out2, Output Voltage
(Pins 9 and 10)
Low Supply Voltage
tf Out1, Out2 Fall Time
Modout Output Voltage
(Pin 12)
Under Low Supply Voltage
Oscillator Output Voltage
(Pin 14)
Thermal Shutdown Temp.
3.1
2.8
3.1
2.8
-50
3.6
3.3
3.6
3.3
-10
60
30
130
4.1
4.3
4.1
4.3
0.3
0.4
0.3
0.3
0.4
0.3
0.4
0.6
V
V VCC:::: +8V, VEE :::: -8V
V
V VCC :::: +8V, VEE :::: -8V
,.,.A
ns
V 10 :::: 30 rnA, TA :::: 25°C
V TA:::: -10 :::z +85°C
V 10 :::: 27 rnA, TA :::: 25°C
ns
V 10 :::: 16 rnA, TA :::: 25°C
V TA:::: -10:::z +85°C
V 10 :::: 24 rnA, TA :::: 25°C
V 10 = 3 rnA, TA :::: 25°C
V TA:::: -10"" +85°C
°C
5-156


Part Number XR-2230
Description Pulse-Width Modulator Control System
Maker Exar
Total Page 7 Pages
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