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參數(shù)資料
| 型號： | LM5000SDX-6EP |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Voltage Switch Mode Regulator |
| 中文描述： | 2.7 A SWITCHING REGULATOR, 1545 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, LLP-16 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 438K |
| 代理商： | LM5000SDX-6EP |
Operation
CONTINUOUS CONDUCTION MODE
The LM5000EP is a current-mode, PWM regulator. When
used as a boost regulator the input voltage is stepped up to
a higher output voltage. In continuous conduction mode
(when the inductor current never reaches zero at steady
state), the boost regulator operates in two cycles.
In the first cycle of operation, shown in
Figure 3
(a), the
transistor is closed and the diode is reverse biased. Energy
is collected in the inductor and the load current is supplied by
C
OUT
.
The second cycle is shown in
Figure 3
(b). During this cycle,
the transistor is open and the diode is forward biased. The
energy stored in the inductor is transferred to the load and
output capacitor.
The ratio of these two cycles determines the output voltage.
The output voltage is defined approximately as:
where D is the duty cycle of the switch, D and D' will be
required for design calculations.
SETTING THE OUTPUT VOLTAGE
The output voltage is set using the feedback pin and a
resistor divider connected to the output as shown in
Figure 1
.
The feedback pin is always at 1.259V, so the ratio of the
feedback resistors sets the output voltage.
INTRODUCTION TO COMPENSATION
20098302
FIGURE 3. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
20098305
FIGURE 4. (a) Inductor current. (b) Diode current.
L
www.national.com
11
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