UNITRODE UC1524, UC2524, UC3524 Technical data

查询UC1524供应商
Advanced Regulating Pulse Width Modulators
UC1524 UC2524 UC3524
FEATURES
Complete PWM Power Control
Circuitry
Uncommitted Outputs for
Single-ended or Push-pull Applications
Low Standby Current…8mA 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, in verters 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 convert ers, transformerless voltage doublers and polarity converter applications em ploying 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 oscilla tor, 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° to +70°C, respectively.
-
-
-
-
BLOCK DIAGRAM
15
V
IN
6
R
T
7
C
T
(RAMP)
INV INPUT
NI INPUT
GROUND
(SUBSTRATE)
1
2
8
REFERENCE REGULATOR
+5V
EA
10
V
REF
16
OSC
1k
OSC OUT
COMPARATOR
10k
3
INTERNAL
Q
QR
CIRCUITRY
+5V
CL
11
13
14
5
4
C
A
E
A
C
B
E
B
–SENSE
+SENSE
+5V 12
9
SHUTDOWN
COMPENSATION
SLUS180D - NOVEMBER 1999 - REVISED AUGUST 2002
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage, VCC(Notes 2 and 3) . . . . . . . . . . . . . . . . . 40V
Collector Output Current. . . . . . . . . . . . . . . . . . . . . . . . . 100mA
Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Current Through C Power Dissipation at T Power Dissipation at T
Terminal . . . . . . . . . . . . . . . . . . . . . . –5mA
T
= +25°C (Note 4). . . . . . . . . . 1000mW
A
= +25°C (Note 4). . . . . . . . . . 2000mW
C
Operating Junction Temperature Range . . . . –55°C to +150°C
Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C
Note 1: Over operating free-air temperature range unless oth
-
erwise noted.
Note 2: All voltage values are with respect to the ground termi
nal, pin 8.
Note 3: The reference regulator may be bypassed for operation
from a fixed 5V supply by connecting the V
CC
and ref erence output pins both to the supply voltage. In this configuration the maximum supply voltage is 6V.
Note 4: Consult packaging section of databook for thermal lim
itations and considerations of package.
RECOMMENDED OPERATING CONDITIONS
Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 40V
Reference Output Current . . . . . . . . . . . . . . . . . . . . . 0 to 20mA
Current through C Timing Resistor, R Timing Capacitor, C Operating Ambient Temperature Range
UC1524 . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
UC2524 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –25°C to +85°C
UC3524 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Terminal . . . . . . . . . . . . . –0.03mA to –2mA
T
. . . . . . . . . . . . . . . . . . . . . 1.8kto 100k
T
. . . . . . . . . . . . . . . . . . . 0.001µF to 0.1µF
T
CONNECTION DIAGRAM
INV INPUT
NON INV
INPUT
OSC OUT
CLSENSE(+)
-
CLSENSE (–-)
-
-
R
C
GND
T
T
UC1524 UC2524 UC3524
1
EA
2
3
4
CL
5
6
OSC
7
8
REF
REG
S/D
16
15
14
13
12
11
10
V
REF
V
IN
E
B
C
B
C
A
E
A
S/D
9
COMP
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for T
for the UC1524, –25°C to +85°C for the UC2524, and 0°C to +70°C for the UC3524, V T
A=TJ
.
= 20V, and f = 20kHz,
IN
= –55°C to +125°C
A
UC1524/UC2524 UC3524 UNITS
PARAMETER TEST CONDITIONS
MIN MAX MIN MAX
Reference Section
Output Voltage 4.8 5.0 5.2 4.6 5.0 5.4 V Line Regulation V Load Regulation I Ripple Rejection f = 120Hz, T Short Circuit Current Limit V
IN = 8 to 40V 10 20 10 30 mV
L = 0 to 20mA 20 50 20 50 mV
J = 25°C 66 66 dB
REF = 0, TJ = 25°C 100 100 mA
Temperature Stability Over Operating Temperature Range 0.3 1 0.3 1 % Long Term Stability T
J = 125°C, t = 1000 Hrs. 20 20 mV
Oscillator Section
Maximum Frequency C Initial Accuracy R Voltage Stability V
= .001mfd, RT= 2k 300 300 kHz
T
and CTConstant 5 5 %
T
= 8 to 40V, TJ= 25°C 1 1 %
IN
Temperature Stability Over Operating Temperature Range 5 5 % Output Amplitude Pin 3, T Output Pulse Width C
T
= 25°C 3.5 3.5 V
J
= .01mfd, TJ= 25°C 0.5 0.5
Error Amplifier Section
Input Offset Voltage V Input Bias Current V
= 2.5V 0.5 5 2 10 mV
CM
= 2.5V 2 10 2 10
CM
Open Loop Voltage Gain 72 80 60 80 dB Common Mode Voltage T
= 25°C 1.8 3.4 1.8 3.4 V
J
2
µs
µA
UC1524 UC2524 UC3524
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for T
for the UC1524, –25°C to +85°C for the UC2524, and 0°C to +70°C for the UC3524, V T
.
A=TJ
PARAMETER TEST CONDITIONS
Error Amplifier Section (cont.)
Common Mode Rejection Ratio T Small Signal Bandwidth A Output Voltage T
Comparator Section
Duty-Cycle % Each Output On 0 45 0 45 % Input Threshold Zero Duty-Cycle 1 1 V
Input Bias Current 1 1
Current Limiting Section
Sense Voltage Pin 9 = 2V with Error Amplifier
Sense Voltage T.C. 0.2 0.2 mV/°C Common Mode Voltage T
Output Section (Each Output)
Collector-Emitter Voltage 40 40 V Collector Leakage Current V Saturation Voltage I Emitter Output Voltage V Rise Time R Fall Time R
Total Standby Current (Note)
= 25°C 70 70 dB
J
V = 0dB, T
= 25°C 0.5 3.8 0.5 3.8 V
J
Maximum Duty-Cycle 3.5 3.5 V
Set for Maximum Out, T
= –55°C to 85°C
J
for the –1V to 1V Limit
= 125°C –0.3 +1 V
T
J
= 40V 0.1 50 0.1 50
CE
C = 50mA 1 2 1 2 V
= 20V 17 18 17 18 V
IN
C = 2k,T C = 2k,T
V
= 40V 8 10 8 10 mA
IN
= 25°C 3 3 MHz
J
= 25°C
J
= 25°C 0.2 0.2
J
= 25°C 0.1 0.1
J
UC1524/UC2524 UC3524 UNITS
MIN MAX MIN MAX
190 200 210 180 200 220 mV
–1 +1 –1 +1 V
= 20V, and f = 20kHz,
IN
= –55°C to +125°C
A
µA
µA
µs µs
PRINCIPLES OF OPERATION
The UC1524 is a fixed-frequency pulse-width-modulation voltage regulator control circuit. The regulator operates at a frequency that is programmed by one timing resistor
), and one timing capacitor (CT), RTestablishes a
(R
T
constant charging current for C voltage ramp at C
, which is fed to the comparator provid
T
ing linear control of the output pulse width by the error amplifier. The UC1524 contains an on-board 5V regulator that serves as a reference as well as powering the UC1524’s internal control circuitry and is also useful in supplying external support functions. This reference volt age is lowered externally by a resistor divider to provide a reference within the common-mode range of the error amplifier or an external reference may be used. The power supply output is sensed by a second resistor di vider network to generate a feedback signal to the error amplifier. The amplifier output voltage is then compared to the linear voltage ramp at C pulse out of the high-gain comparator is then steered to
. This results in a linear
T
. The resulting modulated
T
the appropriate output pass transistor (Q
1 or Q2)bythe
pulse-steering flip-flop, which is synchronously toggled by the oscillator output. The oscillator output pulse also serves as a blanking pulse to assure both outputs are never on simultaneously during the transition times. The
-
width of the blanking pulse is controlled by the valve of
. The outputs may be applied in a push-pull configura
C
T
tion in which their frequency is half that of the base oscil lator, or paralleled for single-ended applications in which the frequency is equal to that of the oscillator. The output
-
of the error amplifier shares a common input to the com parator with the current limiting and shutdown circuitry and can be overridden by signals from either of these in puts. This common point is also available externally and
-
may be employed to control the gain of, or to compen sate, the error amplifier or to provide additional control to the regulator.
3
-
-
-
-
-
TYPICAL CHARACTERISTICS
UC1524 UC2524 UC3524
Open-loop voltage amplification of error amplifier vs frequency.
Oscillator frequency vs timing components.
Output saturation voltage vs load current.Output dead time vs timing capacitance value.
4
APPLICATION INFORMATION
Oscillator
The oscillator controls the frequency of the UC1524 and is programmed by R formula:
where RTis in k
where C
T
where f is in kHz
Practical values of C Practical values of R This results in a frequency range typically from 120Hz to 500kHz.
and CTaccording to the approximate
T
1.18
f
RC
TT
is in mF
fall between 0.001mF and 0.1mF.
T
fall between 1.8kand 100k.
T
UC1524 UC2524 UC3524
amplifier. This can easily be done with the circuit in Fig ure 1:
Synchronous Operation
When an external clock is desired, a clock pulse of ap proximately 3V can be applied directly to the oscillator output terminal. The impedance to ground at this point is approximately 2k. In this configuration R selected for a clock period slightly greater than that of the external clock.
If two or more UC1524 regulators are to operated synchro nously, all oscillator output terminals should be tied to gether, all C
terminals connected to single timing capacitor,
T
and the timing resistor connected to a single R
TCT
T
must be
, terminal.
-
-
-
-
Blanking
The output pulse of the oscillator is used as a blanking pulse at the output. This pulse width is controlled by the value of C
. If small values of CTare required for fre
T
quency control, the oscillator output pulse width may still be increased by applying a shunt capacitance of up to 100pF from pin 3 to ground. If still greater dead-time is re­quired, it should be accomplished by limiting the maxi­mum duty cycle by clamping the output of the error
16
V
REF
1N916
-
COMP 5k9
GND
8
Figure 1. Error amplifier clamp.
The other R
terminals can be left open or shorted to V
T
Minimum lead lengths should be used between the C minals.
T
REF
ter-
.
Figure 2. Single-ended LC switching regulator circuit.
5
V+
+28 V
5k
5k
0.1 F
0.1 F
2k
5k
1
2
5k
16
6
7CT
3OSCOUT
10 SD
15
VIN
UC1524
INV INPUT
NON INV INPUT
VREF
RT
CLSENSE(+)
CLSENSE(-)
GND
8
CA
EA
CB
EB
COMP
12
11
13
14
4
5
9
1k
1W
0.001 F
1k
1W
100
100
50 k
2N4150
2N4150
0.1
20T5T5T
20T
500 F
+
1500 F
UC1524 UC2524 UC3524
5V 5A
Figure 3. Push-pull transformer coupled circuit.
Figure 4. Open loop test circuit.
UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX (603) 424-3460
6
PACKAGE OPTION ADDENDUM
www.ti.com
8-Mar-2005
PACKAGING INFORMATION
Orderable Device Status
(1)
Package
Type
Package Drawing
Pins Package
Qty
Eco Plan
UC1524J OBSOLETE CDIP J 16 None Call TI Call TI
UC1524J/80937 OBSOLETE CDIP J 16 None Call TI Call TI
UC1524J883B OBSOLETE CDIP J 16 None Call TI Call TI
UC2524DW ACTIVE SOIC DW 16 40 None CU NIPDAU Level-2-220C-1 YEAR
UC2524DWTR ACTIVE SOIC DW 16 2000 None CU NIPDAU Level-2-220C-1 YEAR
UC2524J OBSOLETE CDIP J 16 None Call TI Call TI UC2524N ACTIVE PDIP N 16 25 None CU SNPB Level-NA-NA-NA UC3524D ACTIVE SOIC D 16 40 None CU NIPDAU Level-1-220C-UNLIM
UC3524DTR ACTIVE SOIC D 16 2500 None CU NIPDAU Level-1-220C-UNLIM
UC3524DW ACTIVE SOIC DW 16 40 None CU NIPDAU Level-2-220C-1 YEAR
UC3524DWTR ACTIVE SOIC DW 16 2000 None CU NIPDAU Level-2-220C-1 YEAR
UC3524J OBSOLETE CDIP J 16 None Call TI Call TI UC3524N ACTIVE PDIP N 16 25 None CU SNPB Level-NA-NA-NA
(1)
The marketing status values are defined asfollows:
ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the devicewill be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but isnot in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production ofthe device.
(2)
Lead/Ball Finish MSL Peak Temp
(3)
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free). Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products aresuitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens, including bromine (Br) or antimony (Sb) above0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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