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| 型号： | EL7515IY-T7 |
| 厂商： | Intersil |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.6A 10MSOP |
| 标准包装： | 1,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4.5 V ~ 17 V |
| 输入电压： | 1.8 V ~ 13.2 V |
| 频率 - 开关： | 可调至 1.2MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
EL7515
At very low load, the MOSFET will skip pulses sometimes.
This is normal.
The inductor has peak and average current decided by
Equations 4 and 5:
I LPK = I LAVG + ---------
I LAVG = -------------
Current Limit
The MOSFET current limit is nominally 1.4A and guaranteed
1A. This restricts the maximum output current I OMAX based
on Equation 1:
I O
1 – D
Δ I L
2
(EQ. 4)
(EQ. 5)
I OMAX = ? 1 – --------- ? × ----------
V O
Δ I L V IN
? 2 ?
(EQ. 1)
The inductor should be chosen to be able to handle this
current. Furthermore, due to the fixed internal
where:
? Δ I L is the inductor peak-to-peak current ripple and is
compensation, it is recommended that maximum inductance
of 10μH and 15μH to be used in the 5V and 12V or higher
output voltage, respectively.
Δ I L = ---------- × -----
f S
decided by Equation 2:
V IN D
L
(EQ. 2)
The output diode has an average current of I O , and peak
current the same as the inductor's peak current. A Schottky
diode is recommended and it should be able to handle those
currents.
? D is the MOSFET turn-on ratio and is decided by
Equation 3:
The output voltage ripple can be calculated as Equation 6:
Δ V O = -------------------- + I LPK × ESR
V O – V IN
D = ------------------------
V O
(EQ. 3)
I O × D
F S × C O
(EQ. 6)
? f S is the switching frequency
The following table gives typical values:
TABLE 1. MAX CONTINUOUS OUTPUT CURRENTS
Where:
? C O is the output capacitance.
? The ESR is the output capacitor ESR value.
V IN
(V)
2
2
2
3.3
3.3
V O
(V)
5
9
12
5
9
L
(μH)
10
10
10
10
10
F S
(kHz)
1000
1000
1000
1000
1000
I OMAX
(mA)
360
190
140
600
310
Low ESR capacitors should be used to minimize the output
voltage ripple. Multilayer ceramic capacitors (X5R and X7R)
are preferred for the output capacitors since they have a low
ESR and small packages. Tantalum capacitors also can be
used, but they take more board space and have higher ESR.
A minimum of 22μF output capacitor is sufficient for high
output current application. For lower output current, the
output capacitor can be smaller, like 4.7μF. The capacitor
should always have enough voltage rating. In addition to the
3.3
5
12
9
10
10
1000
1000
230
470
voltage rating, the output capacitor should also be able to
handle the RMS current which is given by Equation 7:
? ?
Δ I L
( 1 – D ) × ? D + -------------------- × ------ ? × I LAVG
5
9
12
12
12
15
10
10
10
1000
1000
100
340
630
670
I CORMS =
? 2 12 ?
? I LAVG ?
2
1
(EQ. 7)
Component Considerations
It is recommended that C IN is larger than 10μF.
Theoretically, the input capacitor has a ripple current of Δ I L .
Due to high-frequency noise in the circuit, the input current
ripple may exceed the theoretical value. A larger capacitor
will reduce the ripple further.
7
Output Voltage
An external resistor divider is required to divide the output
voltage down to the nominal 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 300k Ω is recommended.
FN7120.2
August 10, 2007
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参数描述 |
|---|---|
| EL7515IYZ | 功能描述:直流/直流开关调节器 EL7515IYZ HI EFFOO STG RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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| EL7515IYZ-T13S2695 | 制造商:Intersil Corporation 功能描述:EL7515IYZ - FOR TRACKING PURPOSES ONLY, USES PL CODE D3W - Tape and Reel |
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