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參數資料
| 型號： | EL7516 |
| 廠商： | International Rectifier |
| 英文描述： | 600kHz/1.2MHz PWM Step-Up Regulator |
| 中文描述： | 600kHz/1.2MHz PWM升壓調節(jié)器 |
| 文件頁數： | 11/11頁 |
| 文件大?。?/td> | 303K |
| 代理商： | EL7516 |
9
FN7333.3
During the second cycle, the power FET turns off and the
Schottky diode is forward biased, Figure 30. The energy
stored in the inductor is pumped to the output supplying
output current and charging the output capacitor. The
Schottky diode side of the inductor is clamp to a Schottky
diode above the output voltage. So the voltage drop across
the inductor is VIN - VOUT. The change in inductor current
during the second cycle is:
For stable operation, the same amount of energy stored in
the inductor must be taken out. The change in inductor
current during the two cycles must be the same.
FIGURE 28. BOOST CONVERTER
FIGURE 29. BOOST CONVERTER - CYCLE 1, POWER
SWITCH CLOSED
FIGURE 30. BOOST CONVERTER - CYCLE 2, POWER
SWITCH OPEN
Output Voltage
An external feedback resistor divider is required to divide the
output voltage down to the nominal 1.294V reference
voltage. The current drawn by the resistor network should be
limited to maintain the overall converter efficiency. The
maximum value of the resistor network is limited by the
feedback input bias current and the potential for noise being
coupled into the feedback pin. A resistor network less than
100K is recommended. The boost converter output voltage
is determined by the relationship:
The nominal VFB voltage is 1.294V.
Inductor Selection
The inductor selection determines the output ripple voltage,
transient response, output current capability, and efficiency.
Its selection depends on the input voltage, output voltage,
switching frequency, and maximum output current. For most
applications, the inductance should be in the range of 2H to
33H. The inductor maximum DC current specification must
be greater than the peak inductor current required by the
regulator. The peak inductor current can be calculated:
Output Capacitor
Low ESR capacitors should be used to minimized the output
voltage ripple. Multilayer ceramic capacitors (X5R and X7R)
are preferred for the output capacitors because of their lower
ESR and small packages. Tantalum capacitors with higher
ESR can also be used. The output ripple can be calculated
as:
I
L
T2
VIN VOUT
–
L
--------------------------------
×
=
T2
1D
–
FSW
-------------
=
I1 I2
+
0
=
D
FSW
------------
VIN
L
--------- 1D
–
FSW
-------------
VIN VOUT
–
L
--------------------------------
×
+
×
0
=
VOUT
VIN
----------------
1
1D
–
-------------
=
EL7516
COUT
CIN
LD
VIN
VOUT
EL7516
COUT
CIN
L
VIN
VOUT
T1
VO
IL
IL1
EL7516
COUT
CIN
LD
VIN
VOUT
T2
VO
IL2
IL
VOUT
VFB
1
R1
R2
-------
+
×
=
IL PEAK
()
IOUT VOUT
×
VIN
------------------------------------ 12
VIN VOUT VIN
–
()
×
LVOUT FREQ
×
-----------------------------------------------------
×
+
=
V
O
IOUT D
×
FSW CO
×
--------------------------- IOUT ESR
×
+
=
EL7516
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相關代理商/技術參數 |
參數描述 |
|---|---|
| EL7516_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:600kHz/1.2MHz PWM Step-Up Regulator |
| EL7516IY | 功能描述:IC REG BOOST 0.6A 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應商設備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| EL7516IYS2695 | 制造商:Intersil Corporation 功能描述: |
| EL7516IY-T13 | 功能描述:IC REG BOOST 0.6A 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應商設備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
| EL7516IY-T7 | 功能描述:IC REG BOOST 0.6A 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:125mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應商設備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR |
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