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MC33063A-Q1 bảng dữ liệu(PDF) 8 Page - Texas Instruments

tên linh kiện MC33063A-Q1
Giải thích chi tiết về linh kiện  MC33063A-Q1 1.5-A Peak Boost, Buck, Inverting Switching Regulator
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Trang chủ  http://www.ti.com
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MC33063A-Q1 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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V
– Current-Limit Sense Voltage – V
CLS
0
0.2
0.4
0.6
0.8
1
0.03
0.1
0.3
1
3
10
30
V
= 5 V
CC
T = 25°C
A
V
= 40 V
CC
I
= I
chg
dischg
Comparator
Inverting Input
Output
R2
R1
V
= 1.25(R2/R1 + 1)
out
MC33063A-Q1
SLLS654C – APRIL 2005 – REVISED DECEMBER 2014
www.ti.com
Feature Description (continued)
Figure 6. Reference Voltage Circuit
7.3.2 Current Limit
Current limit is accomplished by monitoring the voltage drop across an external sense resistor located in series
with VCC and the output switch. The voltage drop developed across the sense resistor is monitored by the
current-sense pin, Ipk. When the voltage drop across the sense resistor becomes greater than the preset value
of 330 mV, the current-limit circuitry provides an additional current path to charge the timing capacitor (CT)
rapidly, to reach the upper oscillator threshold and, thus, limiting the amount of energy stored in the inductor. The
minimum sense resistor is 0.2 W. Figure 7 shows the timing capacitor charge current versus current-limit sense
voltage. To set the peak current, Ipk = 330 mV/Rsense.
Figure 7. Timing Capacitor Charge Current vs Current-Limit Sense Voltage
7.3.3 Current Limit of Typical Operation Waveforms
The output switch is an NPN Darlington transistor. The collector of the output transistor is tied to pin 1, and the
emitter is tied to pin 2. This allows the designer to use the MC33063 device in buck, boost, or inverter
configurations. The maximum collector-emitter saturation voltage at 1.5 A (peak) is 1.3 V, and the maximum
peak current of the output switch is 1.5 A. For higher peak output current, an external transistor can be used.
Figure 8 shows the typical operation waveforms.
8
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Số phần tương tự - MC33063A-Q1_15

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Mô tả tương tự - MC33063A-Q1_15

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