CA1523 データシートの表示（PDF） - Intersil
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CA1523 Datasheet PDF : 6 Pages
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CA1523
Other Desirable Features
Other desirable features along with various circuit block
function explanations are listed below.
• The Oscillator 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 ICHARGE.
• Charge ICHARGE = IO -IDISCHARGE giving 2 to 1 pulse-width
control
• Discharge IDISCHARGE = approximately 0 to 1/2 IO 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
VSUPPLY 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.
• Separate GND: The power GND is separated from circuit
ground for improved noise.
• ESD Protection: Pins are protected against ESD.
Block Diagram
CURRENT
SENSE
VCC
2
7
ZENER
13
CURRENT
SETUP
REF. VOLTAGE
SOURCES
IC/2
1
ERROR
VOLTAGE
6.8V
REF.
14
TIMING
CAP
S2 OPEN
WHEN VIO > 6.8V
3V
-
REF.
+
S1
+6.8V
REF.
IC VCC
Q HIGH CLOSES S1
VL +
2.5V
-
ID
+
ID ~ IC/2
FOR
VH
5V
-
VI << 6.8V
3
GND
(CONTROL
CIRCUIT
GND)
3K
S3
VCC > 8.4V
1.2V
REF.
-
+
Q LOW
CLOSES S3
SQ
F/F
R
SQ
F/F
R
5V
REF.
4
RISE
TIME
6
PULSE
OUTPUT
5
OUTPUT
GND
11
OVER
CURRENT
10
SLOW
START
12
ON/OFF
9
LOGIC
OUT
3
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