CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.CA1523
Voltage Regulator Control Circuit for Variable Switching Regulator
Description
The CA1523 monolithic silicon integrated circuit is a variable interval pulse regulator designed to provide the control cir-cuitry for use in switching regulator circuits. It operates from 11V to 15V.
The regulator provides a single output drive capable of 300mA source/200mA sink. The maximum operating fre-quency is better than 200kHz. An attractive feature of the CA1523 is that the timing capacitor charge and discharge current is set up externally via a single resistor. The ratio of charge to discharge current is internally set at a maximum of 2 to 1 allowing simultaneous change in output pulse width with increased frequency at higher load. The pulse width variation at higher frequencies effectively compensates for the losses in magnetics and thereby increases the power supply efficiency at higher load end by as much as 20percent.
Features
•Operates up to 200kHz •Pins ESD Protected •Remote ON/OFF •Slow Start with Reset •Overcurrent Sensing
•Lower Peak Currents than PWM Regulator -Less Prone to Magnetic Saturation
Ordering Information
PART NUMBER TEMPERATURE
RANGE PACKAGE CA1523E
0o C to +70o C
14 Lead Plastic DIP
File Number
1785.2
April 1994
Pinout
CA1523 (PDIP)TOP VIEW
ERROR
CURRENT SENSE
GND RISE TIME OUTPUT GND
OUTPUT
V CC
TIMING ZENER ON/OFF
OVER CURRENT SLOW START LOGIC OUTPUT NC
1234567
141312111098
Specifications CA1523 Absolute Maximum Ratings Thermal Information
DC Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V Supply Current
|6(MAX). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±50mA |6(MAX), 1µs,1800pF Load. . . . . . . . . . . . . . . . . . . .+300, -200mA Device Dissipation胸片数据库
Up to T A = 70o C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .530mW Above T A = 70o C. . . . . . . . . . . . . . .Derate Linearly at 6.7mW/o C Thermal ResistanceθJA Plastic DIP Package . . . . . . . . . . . . . . . . . . . . . . . .120o C/W Device Dissipation
Up to T A = 70o C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .665mW Ambient Temperature Range
Operating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0o C to +70o C Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-55o C to +150o C Lead Temperature (During Soldering)
At distance 1/16± in. (1.59mm±0.79mm)
from case for 10s Max. . . . . . . . . . . . . . . . . . . . . . . . . . . .+265o C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Electrical Specifications T A = +25o C, Refer to condition shown in test circuit; V7 = 13V, V1 = 5.9V Unless Otherwise Specified PARAMETERS PIN TEST CONDITIONS MIN TYP MAX UNITS POWER SUPPLY, V CC (PIN 7)
Supply Voltage79.513-V Supply Current7V CC = +13V202734mA Zener Voltage137.88.48.9V OUTPUT PULSE (PIN 6)
Maximum Pulse Width6Measured at 6V Threshold Level 5.5 6.57.5µs Minimum Pulse Width6Measured at 6V Threshold Level234µs Output High Voltage6|6 = 0mA, V4 = 0V11.11212.6V Output Low Voltage6|6 = 50mA, V12 = 0V0.61 1.3V Rise Time6Measured at 1.8V and 10V Threshold Levels2506001250ns Fall Time6Measured at 1.8V and 10V Threshold Levels50200350ns ERROR VOLTAGE RANGE (PIN 1)
Error Voltage Reference1Adjust R T; Observe Pin 6 Min/Max
Frequency Range
5.9
6.8
7.5V CHARGE CURRENT (PIN 14)
Charge Current14Adjust R T, V1 = 7.5V; Set V14 = 0V, Then V14 = 2.5V190220250µA Discharge Current14Adjust R T = 5.9V; Set V14 = 5.5V, Then 5V95110125µA Slow Start Discharge Current14Maintain V14 = 5V, V10 = 5.5V
Set V10 = 5.5V, Measure I14 (Hi)
Set V10 = 4V, Measure I14 (Lo)
Limits = I14 (Hi) - I14 (Lo)
1.5
203040µA/V
LOGIC TESTS
Discharge Voltage10Pin 12 = 1kΩ to GND 1.7 2.4 3.2V Output Inhibit Voltage7Increase V7 Until V9≥ 2V7.98.49.1V Overcurrent Trip Voltage11V12 = 5V; V10 = 0V; Increase V11 Until V9≤ 0.5V 1.1 1.25 1.4V
Other Desirable Features
Other desirable features along with various circuit block function explanations are listed below.
•The Oscillato r is a sawtooth generator whose charge (rise) cycle determines the output pulse width and dis-charge which is continuously variable from very low to maximum of I CHARGE .•Charge I CHARGE = I O -I DISCHARGE giving 2 to 1 pulse-width control
•Discharge I DISCHARGE = approximately 0 to 1/2 I O to frequency control.•Pulse Shaping:Applied to the oscillator output via RS Flip-Flop with parallel inhibit controlled by slow-start over-current sense, supply voltage monitor and ON/OFF func-tions.•Pulse Rise Time:Modified to meet RFI requirements by external slow-down capacitor.
•Slow Start with Reset:Externally programmed against internal 3V reference. Reset is initiated upon Inhibit ensur-ing soft start at power up and restart.•Over Current Sense:Internal stable thresholds of 1.2V.•Supply Voltage Monitors:Locks out the drive until V SUPPLY has reached 8V-9V.•ON/OFF:Activates regulator independent of raw DC.•Error Amplifier:Compares output against a stable 6.8V internal reference and controls the discharge current sink on the timing capacitor.•Band-Gap:Reference voltage (internal) provides temper-ature compensated 1.2V and 6.8V references.•Se
parate GND:The power GND is separated from circuit ground for improved noise.•ESD Protection:Pins are protected against ESD.
Block Diagram
1417
CURRENT SENSE
I C/2
I C
+6.8V REF.
ERROR VOLTAGE
V CC V CC
103K
S 3
1.2V REF.
-+
I D ~ I C/2FOR V I << 6.8V女行长的沉沦
12ON/OFF
3Q HIGH CLOSES S 1
S 1CURRENT SETUP
Q LOW CLOSES S 3
+
-V CC > 8.4V
-
+
-
+
V L 2.5V
V H 5V
LOGIC OUT
9S
R
Q
F/F
S
R
Q F/F 4REF. VOLTAGE SOURCES
13
5
611
2ZENER 6.8V REF.
TIMING CAP
GND
S 2 OPEN WHEN V IO > 6.8V
3V (CONTROL CIRCUIT GND)
SLOW START
REF.
5V REF.
RISE TIME PULSE OUTPUT
OUTPUT GND
OVER CURRENT
I D
FIGURE 1.TEST CIRCUIT FOR THE CA1523
1142-+
-+
3
91210+-11
6
547
+
8
13V CC 15K
20K TRIM RES.
R T
ERROR VOLTAGE
TIMING 240pF
(CONTROL
CIRCUIT
GND)
V CC 12K
30K
V IO
SLOW START
ON/OFF
ON
OFF
220220
1K
Q LOW
CLOSES
S3
S3
3K 3V REF.
6.8V REF
S2 OPEN
WHEN V10 > 6.8V
S2
V CC >6.4V 1.2V REF.
+5V
V CC +6.8V REF
I C/2
CURRENT SET UP
I C S1Q HIGH CLOSES S1I D ˜I C/2
FOR V I <<6.8V
V CC
REF. VOLT.SOURCES
ZENER
5V
5V NC
S Q
R Q
V H
RISE/FALL
47pF
PULSE OUTPUT 1800pF
OUTPUT GND
OVER CURRENT
1K
V 11
LOGIC OUT
56K
0.0033µF
CHARGE CURRENT S R
Q F/F
F/F
V CC
V L 2.5V
+
-
REF
FIGURE 2.TYPICAL APPLICATION CIRCUIT FOR THE CA1523
人体之最
FIGURE 3.TIMING CIRCUIT FOR THE CA1523
+150V
RECTIFIED AC LINE
INPUT
30k
1.5k
OPTO-COUPLER
11k
68µF
220
6824068k
0.003322pF
0.153W
2012高中数学联赛
47ΩNC NC NC RFP 7N40
11V
20k (TRIM RESISTOR)
5.6k 10W
4.7µF
SENSE F E E D B A C K
P R I M A R Y
SEC. “D”
SEC. “C”SEC. “D”
S E C . “A ”
TRANSFORMER
TYP . INPUT
+1500.85A
------------16k
13V
+
124
143
2
115
6
7
1
139
8
10
CA1523
pF pF
µF
+ON/OFF BIAS VOLT-AGE
V 04V 02V 01V 03TYPICAL RECT.OUTPUT +130V -24V
+16V
+24V
910
1
+
+
2
7
14
LOGIC OUT
6K
3K
12K
SLOW START +V CC 30K
1.5K
ERROR +7.5V
8.3K
6.8V
1.21V
1.8K
BAND GAP REF VOLTAGE
8K
15K
4K
10K
10K
V CC 1.5K
2K
2K
2.5V 5.0V
-
V L
V H
R S
Q
Q +7.5V 2K
+V CC
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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