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| 型号： | SP7663ER-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 26DFN |
| 标准包装： | 3,000 |
| 系列： | Power Blox™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.8V |
| 输入电压： | 5 V ~ 22 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 6A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 26-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 26-DFN（7x4） |
S P 7 6 6 3
P o w e r b l o x T M
6 A 6 0 0 K H z S y n c h r o n o u s S t e p D o w n R e g u l a t o r
on the thermal conditions in the system such
as ambient temperature, airflow and heat
sinking. Maximum output current could be
limited by thermal limitations of a particular
application by taking advantage of the
integrated-over-temperature protective
scheme employed in the SP7663. The SP7663
incorporates a built-in overtemperature
protection to prevent internal overheating.
S ETTING O UTPUT V OLTAGES
The SP7663 can be set to different output
voltages. The relationship in the following
formula is based on a voltage divider from the
output to the feedback pin VFB, which is set to
The second feature is a 100% duty cycle
timeout that ensures synchronized refreshing
of the BST capacitor at very high duty ratios.
In the event that the high side NFET is on for
20 continuous clock cycles, a reset is given to
the PWM flip flop half way through the 21 st
cycle. This forces GL to rise for the cycle, in
turn refreshing the BST capacitor. The boost
capacitor is used to generate a high voltage
drive supply for the high side switch, which is
V CC above V IN .
I NTEGRATED P OWER MOSFET S
The SP7663 contains a pair of integrated low
resistance N-channel switches designed to
drive up to 6A of output current. Care should
be taken to de-rate the output current based
APPLICATIONS INFORMATION
I NDUCTOR S ELECTION
There are many factors to consider in selecting
the inductor including core material,
inductance vs. frequency, current handling
capability, efficiency, size and EMI. In a
typicalSP7663 circuit, the inductor is chosen
primarily for value, saturation current and DC
resistance. Increasing the inductor value will
decrease output voltage ripple, but degrade
transient response. Low inductor values
provide the smallest size, but cause large
ripple currents, poor efficiency and require
more output capacitance to smooth out the
an internal reference voltage of 0.80V.
Standard 1% metal film resistors of surface
mount size 0603 are recommended.
So
Where R 1 = 10kΩ and for V OUT = 0.80V
setting, simply remove R 2 from the board.
Furthermore, one could select the value of the
R 1 and R 2 combination to meet the exact
output voltage setting by restricting the R 1
resistance range such that 10kΩ<R 1 <100kΩ
for overall system loop stability.
larger ripple current. The inductor must be
able to handle the peak current at the
switching frequency without saturating, and
the copper resistance in the winding should be
kept as low as possible to minimize resistive
power loss. A good compromise between size,
loss and cost is to set the inductor ripple
current to be within 20% to 40% of the
maximum output current.
The switching frequency and the inductor
operating point determine the inductor value
as follows:
? 2012 Exar Corporation
11/18
Rev. 2.2.0
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相关代理商/技术参数 |
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