- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄379730 > CA1524E (INTERSIL CORP) Regulating Pulse Width Modulator PDF資料下載
參數(shù)資料
| 型號(hào)： | CA1524E |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Regulating Pulse Width Modulator |
| 中文描述： | 0.1 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 206K |
| 代理商： | CA1524E |
7
CA1524, CA2524, CA3524
Circuit Description
Voltage Reference Section
The CAl524 series contains an internal series voltage regu-
lator employing a zener reference to provide a nominal 5-volt
output, which is used to bias all internal timing and control
circuitry. The output of this regulator is available at terminal
l6 and is capable of supplying up to 50mA output current.
Figure 1 shows the temperature variation of the reference
voltage with supply voltages of 8V to 40V and load currents
up to 20mA. Load regulation and line regulation curves are
shown in Figures 2 and 3, respectively.
FIGURE 1. TYPICAL REFERENCE VOLTAGE AS A FUNCTION
OF AMBIENT TEMPERATURE
FIGURE 2. TYPICAL REFERENCE VOLTAGE AS A FUNCTION
OF REFERENCE OUTPUT CURRENT
FIGURE 3. TYPICAL REFERENCE VOLTAGE AS A FUNCTION
OF SUPPLY VOLTAGE
5.02
5.00
4.98
4.96
R
-60 -40 -20
0
20
40
60
80 100 120 140
AMBIENT TEMPERATURE (
o
C)
V+ = 40V, I
L
= 0mA
V+ = 20V, I
L
= 0mA
V+ = 40V, I
L
= 20mA
V+ = 8V, I
L
= 0mA
V+ = 20V, I
L
= 20mA
V+ = 8V, I
L
= 20mA
R
5.1
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
0
8
16
24
32
40
48
56
64
72
80
REFERENCE OUTPUT CURRENT (mA)
TA = +25oC
V+ = 20V
V+ = 40V
V+ = 20V
V+ = 8V
6
5
4
3
2
1
0
0
7
8
R
10
20
30
40
SUPPLY VOLTAGE, V+ (V)
TA = +25oC
Osclllator Section
Transistors Q42, Q43 and Q44, in conjunction with an
external resistor R
T
, establishes a constant charging current
into an external capacitor C
T
to provide a linear ramp voltage
at terminal 7. The ramp voltage has a value that ranges from
0.6V to 3.5V and is used as the reference for the comparator
in the device. The charging current is equal to (5-2V
BE
)/R
T
or
approximately 3.6/R
T
and should be kept within the range of
30pA to 2mA by varying R
T
. The discharge time of C
T
deter-
mines the pulse width of the oscillator output pulse at termi-
nal 3. This pulse has a practical range of 0.5
μ
s to 5
μ
s for a
capacitor range of 0.001 to 0.1
μ
F. The pulse has two internal
uses: as a dead-time control of blanking pulse to the output
stages to assure that both outputs cannot be on simulta-
neously and as a trigger pulse to the internal flip-flop which
controls the switching of the output between the two output
channels. The output dead-time relationship is shown in Fig-
ure 4. Pulse widths less than 0.5
μ
s may allow false trigger-
ing of one output by removing the blanking pulse prior to a
stable state in the flip-flop.
FIGURE 4. TYPICAL OUTPUT STAGE DEAD TIME AS A
FUNCTION OF TIMING CAPACITOR VALUE
If a small value of C
T
must be used, the pulse width can be
further expanded by the addition of a shunt capacitor in the
order of 100pF but no greater than 1000pF, from terminal 3
to ground. When the oscillator output pulse is used as a sync
input to an oscilloscope, the cable and input capacitances
may increase the pulse width slightly. A 2-K
resistor at
terminal 3 will usually provide sufficient decoupling of the
cable. The upper limit of the pulse width is determined by the
maximum duty cycle acceptable.
The oscillator period is determined by R
T
and C
T
, with an
approximate value of t = R
T
C
T
, where R
T
is in ohms, C
T
is in
μ
F, and t is in
μ
s. Excess lead lengths, which produce stray
capacitances, should be avoided in connecting R
T
and C
T
to
their respective terminals. Figure 5 provides curves for
selecting these values for a wide range of oscillator periods.
For series regulator applications, the two outputs can be
connected in parallel for an effective 0-90% duty cycle with
the output stage frequency the same as the oscillator
frequency. Since the outputs are separate, push-pull and
flyback applications are possible. The flip-flop divides the
frequency such that the duty cycle of each output is 0-45%
and the overall frequency is half that of the oscillator. Curves
O
μ
s
100
10
1.0
0.1
0.0001
0.001
TIMING CAPACITOR, C
T
(
μ
F)
0.01
0.1
1.0
T
A
= +25
o
C
V+ = 8V - 40V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CA1524F | Regulating Pulse Width Modulator |
| CA3524E | Regulating Pulse Width Modulator |
| CA3524F | Regulating Pulse Width Modulator |
| CA509 | Current Regulator Diode |
| CA503 | Current Regulator Diode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CA1524ER3575 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| CA1524F | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Regulating Pulse Width Modulator |
| CA15359_EMILY-WW | 功能描述:LENS 0 POS MM (D) MM(H) 制造商:ledil 系列:* 零件狀態(tài):有效 標(biāo)準(zhǔn)包裝:130 |
| CA15365_TINA2-O-WAS | 功能描述:ASSEMBLY ROUND 1 POS 16MM (D) 9. 制造商:ledil 系列:- 零件狀態(tài):有效 類型:- 顏色:- LED 數(shù):- 配套使用產(chǎn)品/相關(guān)產(chǎn)品:- 透鏡樣式/尺寸:- 光學(xué)圖像:- 視角:- 安裝類型:- 標(biāo)準(zhǔn)包裝:230 |
| CA1541D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:General Application Sense Amplifier |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。