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參數(shù)資料
| 型號： | CA1523E |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 59K |
| 代理商： | CA1523E |
7-13
CA1523
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.
Separate GND:
The power GND is separated from circuit
ground for improved noise.
ESD Protection:
Pins are protected against ESD.
Block Diagram
14
1
7
CURRENT
SENSE
I
C/2
I
C
+6.8V
REF.
ERROR
VOLTAGE
V
CC
V
CC
10
3K
S
3
1.2V
REF.
-
+
I
D
~
I
C/2
FOR
V
I
<< 6.8V
12
ON/OFF
3
Q HIGH CLOSES S
1
S
1
CURRENT
SETUP
Q LOW
CLOSES S
3
+
-
V
CC
> 8.4V
-
+
-
+
V
L
2.5V
V
H
5V
LOGIC
OUT
9
S
R
Q
F/F
S
R
Q
F/F
4
REF. VOLTAGE
SOURCES
13
5
6
11
2
ZENER
6.8V
REF.
TIMING
CAP
GND
S
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
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