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參數(shù)資料
| 型號： | TL3577-ADJIKTTRG3 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | PLASTIC, D2PAK, TO-263, 5 PIN |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 431K |
| 代理商： | TL3577-ADJIKTTRG3 |
www.ti.com
Step-Up (Boost) Regulator
Step-Up Regulator Design Procedure
V
SW(OFF)
V
SAT
0 V
0
V
F
V
R
I
IND(AVG)
I
SW(PK)
I
D(PK)
I
D(AVG)
I
IND
Switch
Voltage
Diode
Voltage
Inductor
Current
Switch
Current
Diode
Current
100-kHz CURRENT-MODE SIMPLE STEP-UP/FLYBACK SWITCHING REGULATOR
SLVS633 – OCTOBER 2006
APPLICATION INFORMATION (continued)
Figure 2 shows a step-up switching regulator utilizing the TL3577. The regulator produces an output voltage
higher than the input voltage. The TL3577 turns its switch on and off at a fixed frequency of 100 kHz, thus
storing energy in the inductor (L). When the NPN switch is on, the inductor current is charged at a rate of VIN/L.
When the switch is off, the voltage at the SWITCH terminal of the inductor rises above VIN, discharging the
stored current through the output diode (D) into the output capacitor (COUT) at a rate of (VOUT – VIN)/L. The
energy stored in the inductor is thus transferred to the output. The output voltage is controlled by the amount of
energy transferred, which is controlled by modulating the peak inductor current. This modulation is accomplished
by feeding a portion of the output voltage to an error amplifier that amplifies the difference between the feedback
voltage and an internal 1.23-V precision reference voltage. The output of the error amplifier is compared to a
voltage that is proportional to the switch current or the inductor current during the switch-on time. A comparator
terminates the switch-on time when the two voltages are equal and, thus, controls the peak switch current to
maintain a constant output voltage. Figure 5 shows voltage and current waveforms for the circuit. Formulas for
calculation are shown in Table 1.
Given:
VIN(min) = Minimum input supply voltage
VOUT = Regulated output voltage
Figure 5. Step-Up Regulator Waveforms
12
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| TL3577-ADJIKTTR | 6 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PSSO5 |
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| TL431AIX/11H-E3 | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PSSO3 |
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相關(guān)代理商/技術(shù)參數(shù) |
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| TL35A | 功能描述:測試引線 TEST LEAD WITH ALL RoHS:否 制造商:Pomona Electronics 設(shè)備類型:Patch Cords 連接器類型:Banana plug (stackable) on both ends 長度:60 in 顏色:Black |
| TL35B | 功能描述:測試引線 TEST LEAD W/ALLIGATOR CLIPS-CE RoHS:否 制造商:Pomona Electronics 設(shè)備類型:Patch Cords 連接器類型:Banana plug (stackable) on both ends 長度:60 in 顏色:Black |
| TL36 | 功能描述:測試引線 TEST LEADS W/CLIPS RoHS:否 制造商:Pomona Electronics 設(shè)備類型:Patch Cords 連接器類型:Banana plug (stackable) on both ends 長度:60 in 顏色:Black |
| TL-36 | 制造商:B&K Precision Corporation 功能描述: |
| TL360W | 制造商:General Tools 功能描述:All Weather Test Leads 制造商:General Tools 功能描述:TEST LEADSALL WEATHER |
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