(PDF) UC3524 Datasheet PDF | etcTI





UC3524 Datasheet PDF

Part Number UC3524
Description ADVANCED REGULATING PULSE WIDTH MODULATORS
Manufacture etcTI
Total Page 18 Pages
PDF Download Download UC3524 Datasheet PDF

Features: Datasheet pdf www.ti.com UC1524 UC2524 UC3524 SLUS180 E – NOVEMBER 1999 – REVISED OCTOBER 2005 ADVANCED REGULATING PULSE WIDTH MODULATORS FEATURES • Complete PWM P ower Control Circuitry • Uncommitted Outputs for Single-Ended or Push-Pull A pplications • Low Standby Current . . . 8 mA Typical • Interchangeable Wit h SG1524, SG2524 and SG3524, Respective ly DESCRIPTION The UC1524, UC2524 and UC3524 incorporate on a single monolith ic chip all the functions required for the construction of regulating power su pplies, inverters or switching regulato rs. They can also be used as the contro l element for high-power-output applica tions. The UC1524 family was designed f or switching regulators of either polar ity, transformer-coupled dc-to-dc conve rters, transformerless voltage doublers and polarity converter applications em ploying fixedfrequency, pulse-width mod ulation techniques. The dual alternatin g outputs allow either single-ended or push-pull applications. Each device includes an on-chip reference, error am.

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UC3524 datasheet
www.ti.com
UC1524
UC2524
UC3524
SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005
ADVANCED REGULATING PULSE WIDTH MODULATORS
FEATURES
Complete PWM Power Control Circuitry
Uncommitted Outputs for Single-Ended or
Push-Pull Applications
Low Standby Current . . . 8 mA Typical
Interchangeable With SG1524, SG2524 and
SG3524, Respectively
DESCRIPTION
The UC1524, UC2524 and UC3524 incorporate on a
single monolithic chip all the functions required for the
construction of regulating power supplies, inverters or
switching regulators. They can also be used as the
control element for high-power-output applications.
The UC1524 family was designed for switching
regulators of either polarity, transformer-coupled
dc-to-dc converters, transformerless voltage doublers
and polarity converter applications employing fixed-
frequency, pulse-width modulation techniques. The
dual alternating outputs allow either single-ended or
push-pull applications. Each device includes an
on-chip reference, error amplifier, programmable
oscillator, pulse-steering flip-flop, two uncommitted
output transistors, a high-gain comparator, and
current-limiting and shut-down circuitry. The UC1524
is characterized for operation over the full military
temperature range of –55°C to 125°C. The UC2524
and UC3524 are designed for operation from –25°C
to 85°C and 0°C to 70°C, respectively.
BLOCK DIAGRAM
VREF
16
OSC OUT
3
VIN 15
RT 6
CT 7
(RAMP)
INV INPUT 1
NI INPUT 2
GROUND 8
REFERENCE
OSC
+5V
Q
RQ
+5V TO ALL
INTERNAL
+5V
EA
+
COMPARATOR
+5V
10k
1k
10
SHUTDOWN
9
COMPENSATION
12 CA
11 EA
13 CB
14 EB
5 SENSE
CL
4 +SENSE
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 1999–2005, Texas Instruments Incorporated

UC3524 datasheet
UC1524
UC2524
UC3524
SLUS180E – NOVEMBER 1999 – REVISED OCTOBER 2005
CONNECTION DIAGRAM
VREF
VIN
EB
CB
CA
EA
16 15 14 13 12 11
S/D COMP
10 9
REFERENCE
REGULATOR
ERROR
AMP
S/D
CURRENT
AMP
OSCILLATOR
www.ti.com
12345
INV INPUT NON INV OSC OUT CL
CL
INPUT
SENSE(+) SENSE (-)
6
RT
78
CT GND
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)
VCC Supply voltage(1)(2)
Collector output current
Reference output current
Current through CT terminalg
Power dissipation
TA = 25°C(3)
TC = 25°C(3)
Operating junction temperature range
Storage temperature range
UNIT
40 V
100 mA
50 mA
–50 mA
1000 mW
2000 mW
–55°C to 150°C
–65°C to +150°C
(1) All voltage values are with respect to the ground terminal, pin 8.
(2) The reference regulator may be bypassed for operation from a fixed 5 V supply by connecting the VCC and reference output pins both to
the supply voltage. In this configuration the maximum supply voltage is 6 V.
(3) Consult packaging section of data book for thermal limitations and considerations of package.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VCC Supply voltage
Reference output current
Current through CT terminal
RT Timing resistor
CT Timing capacitor
UC1524
Operating ambient temperature range UC2524
UC3524
MIN
8
0
–0.03
1.8
0.001
–55
–25
0
NOM
MAX
40
20
–2
100
0.1
125
85
70
UNIT
V
mA
mA
k
µF
°C
2




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