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| 型号： | EL7512CYZ-T13 |
| 厂商： | Intersil |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 90% |
| 电源电压： | 2 V ~ 12 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
EL7512
diode is recommended and it should be able to handle those
currents.
Output voltage ripple is the product of peak inductor current
times the ESR of output capacitor. Low ESR capacitor is to
be used to reduce the output ripple. The minimum output
capacitance of 330μF, 47μF, and 33μF is recommended for
5V, 12V, and 16V for 600kHz switching frequency,
respectively. For 1MHz switching frequency, 220μF, 33μF,
and 22μF capacitor can be used for the output voltages. In
addition to the voltage rating, the output capacitor should
Layout Considerations
The layout is very important for the converter to function
properly. Power Ground ( ) and Signal Ground ( - -- )
should be separated to ensure that the high pulse current in
the Power Ground never interferes with the sensitive signals
connected to Signal Ground. They should only be connected
at one point.
The trace connected to pin 8 (FB) is the most sensitive trace.
It needs to be as short as possible and in a “quiet” place,
preferably between PGND or SGND traces.
also be able to handle the rms current is given by:
In addition, the bypass capacitor connected to the V DD pin
? ?
? I L
( 1 – D ) × ? D + -------------------- × ------ ? × I LAVG
I CORMS =
? 2 12 ?
? I LAVG ?
2
1
needs to be as close to the pin as possible.
The heat of the chip is mainly dissipated through the SGND
pin. Maximizing the copper area around it is preferable. In
addition, a solid ground plane is always helpful for the EMI
V OUT = V FB × ? 1 + ------ 2 - ?
I DD
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 ? is recommended.
The boost converter output voltage is determined by the
relationship:
? R ?
? R 1 ?
where V FB slightly changes with V DD . The curve is shown in
this data sheet.
RC Filter
The maximum voltage rating for the V DD pin is 12V and is
recommended to be about 10V for maximum efficiency to
drive the internal MOSFET. The series resistor R4 in the RC
filter connected to V DD can be utilized to reduce the voltage.
If V O is larger than 10V, then:
V O – 10
R 4 = ---------------------
where I DD is shown in I DD vs F S curve. Otherwise, R4 can
be 10 ? to 51 ? with C4 = 0.1μF.
Thermal Performance
The EL7512 uses a fused-lead package, which has a
reduced θ JA of 100°C/W on a four-layer board and 115°C/W
on a two-layer board. Maximizing copper around the ground
pins will improve the thermal performance.
This chip also has internal thermal shut-down set at around
135°C to protect the component.
7
performance.
The demo board is a good example of layout based on these
principles. Please refer to the EL7512 Application Brief for
the layout.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EL7512CYZ-T7 | 功能描述:IC REG CTRLR BST PWM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| EL7513 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:White LED Step-Up Regulator |
| EL7513_06 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:White LED Step-Up Regulator |
| EL7513AIWTZ-T7 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| EL7513IWT | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:White LED Step-Up Regulator |
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