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參數(shù)資料
| 型號： | EL7512CY-T13 |
| 廠商： | ELANTEC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Frequency PWM Step-Up Regulator |
| 中文描述： | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MSOP-10 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 249K |
| 代理商： | EL7512CY-T13 |
6
Applications Information
The EL7512 is a step-up regulator, operated at fixed
frequency pulse-width-modulation (PWM) control. The input
voltage is 2V-12V and output voltage is 5V-18V. The
switching frequency (up to 1.2MHz) is decided by the
resistor connected to RT pin.
Start-Up
After V
DD
reaches a threshold of about 2V, the start-up
oscillator generates fixed duty-ratio of 0.5-0.7 at a frequency
of several hundred kilohertz. This will boost the output
voltage.
When V
DD
reaches about 3.7V, the PWM comparator takes
over the control. The duty ratio will be decided by the
multiple-input direct summing comparator, Max_Duty signal
(about 90% duty-ratio), and the Current Limit Comparator,
whichever is the smallest.
The soft-start is provided by the current limit comparator. As
the internal 12μA current source charges the external CSS,
the peak MOSFET current is limited by the voltage on the
capacitor. This in turn controls the rising rate of the output
voltage.
The regulator goes through the start-up sequence as well
after the EN signal is pulled to HI.
Steady-State Operation
When the output reaches the preset voltage, the regulator
operates at steady state. Depending on the input/output
conditions and component values, the inductor operates at
either continuous-conduction mode or discontinuous-
conduction mode.
In the continuous-conduction mode, the inductor current is a
triangular waveform and LX
voltage a pulse waveform. In the
discontinuous-conduction mode, the inductor current is
completely dried out before the MOSFET is turned on again.
The input voltage source, the inductor, and the MOSFET and
output diode parasitic capacitors forms a resonant circuit.
Oscillation will occur in this period. This oscillation is normal
and will not affect the regulation.
At very low load, the MOSFET will skip pulses sometimes.
This is normal.
Current Limit
The MOSFET current limit is nominally 1.2A and guaranteed
1A. This restricts the maximum output current I
OMAX
based
on the following formula:
where:
I
L
is the inductor peak-to-peak current ripple and is
decided by:
D is the MOSFET turn-on ratio and is decided by:
F
S
is the switching frequency.
The following table gives typical values:
Component Considerations
It is recommended that C
IN
is larger than 10μF.
Theoretically, the input capacitor has ripple current of
I
L
.
Due to high-frequency noise in the circuit, the input current
ripple may exceed the theoretical value. Larger capacitor will
reduce the ripple further.
The inductor has peak and average current decided by:
The inductor should be chosen to be able to handle this
current. Furthermore, due to the fixed internal
compensation, it is recommended that maximum inductance
of 10μH and 15μH to be used in the 5V and 12V or higher
output voltage, respectively.
The output diode has average current of I
O
, and peak
current the same as the inductor's peak current. Schottky
I
OMAX
1
I
L
2
--------
–
V
O
---------
×
=
MAX CONTINUOUS OUTPUT CURRENTS
V
IN
(V)
V
O
(V)
L (μH)
F
S
(kHz)
I
OMAX
(mA)
2
5
10
1000
360
2
9
10
1000
190
2
12
10
1000
140
3.3
5
10
1000
600
3.3
9
10
1000
310
3.3
12
10
1000
230
5
9
10
1000
470
5
12
10
1000
340
5
15
10
1000
260
9
12
10
1000
630
9
15
10
1000
470
12
15
10
1000
670
12
18
11
1000
510
I
L
V
---------
S
------
×
=
D
V
-----------------------
V
–
V
O
=
I
LPK
I
LAVG
I
L
2
--------
+
=
I
LAVG
I
–
1
D
-------------
=
EL7512
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PDF描述 |
|---|---|
| EL7512CY-T7 | High Frequency PWM Step-Up Regulator |
| EL7512CYZ | High Frequency PWM Step-Up Regulator |
| EL7512CYZ-T13 | High Frequency PWM Step-Up Regulator |
| EL7512CYZ-T7 | High Frequency PWM Step-Up Regulator |
| EL7513IY-T13 | White LED Step-Up Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL7512CY-T7 | 功能描述:IC REG CTRLR BST PWM 10-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| EL7512CYZ | 功能描述:IC REG CTRLR BST PWM 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| EL7512CYZ-T13 | 功能描述:IC REG CTRLR BST PWM 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| EL7512CYZ-T7 | 功能描述:IC REG CTRLR BST PWM 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| EL7513 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:White LED Step-Up Regulator |
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