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参数资料
| 型号： | SP7651EB |
| 厂商： | Exar Corporation |
| 文件页数： | 4/15页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP7651 |
| 标准包装： | 1 |
| 系列： | * |
PIN DESCRIPTION
Pin #
-3
4,8, 9-2
5
6
7
9
0- 3
4- 6,23-26
7
8
22
Pin Name
P GND
GND
V FB
COMP
UVIN
SS
V IN
LX
NC
BST
Vcc
Description
Ground connection for the synchronous rectifier
Ground Pin. The control circuitry of the IC and lower power driver are refer -
enced to this pin. Return separately from other ground traces to the (-) terminal
of Cout.
Feedback Voltage and Short Circuit Detection pin. It is the inverting input of the
Error Amplifier and serves as the output voltage feedback point for the Buck
Converter. The output voltage is sensed and can be adjusted through an exter -
nal resistor divider. Whenever V FB drops 0.25V below the positive reference, a
short circuit fault is detected and the IC enters hiccup mode.
Output of the Error Amplifier. It is internally connected to the inverting input of
the PWM comparator. An optimal filter combination is chosen and connected
to this pin and either ground or V FB to stabilize the voltage mode loop.
UVLO input for Vin voltage. Connect a resistor divider between V IN and UV IN to
set minimum operating voltage.
Soft Start. Connect an external capacitor between SS and GND to set the soft
start rate based on the 0μA source current. The SS pin is held low via a mA
(min) current during all fault conditions.
Input connection to the high side N-channel MOSFET. Place a decoupling
capacitor between this pin and P GND .
Connect an inductor between this pinand V OUT
No Connect
High side driver supply pin. Connect BST to the external boost diode and ca-
pacitor as shown in the Typical Application Circuit on page . High side driver
is connected between BST pin and SWN pin.
Input for external 5V bias supply
General Overview
The SP7651 is a fixed frequency, voltage
mode, synchronous PWM regulator opti-
mized for high efficiency. The part has been
designed to be especially attractive for split
plane applications utilizing 5V to power the
controller and 2.5V to 20V for step down
conversion.
The heart of the SP765 is a wide bandwidth
transconductance amplifier designed to ac -
commodate Type II and Type III compensa-
tion schemes. A precision 0.8V reference,
present on the positive terminal of the error
amplifier, permits the programming of the
output voltage down to 0.8V via the V FB pin.
The output of the error amplifier, COMP,
which is compared to a . V peak-to-peak
ramp, is responsible for trailing edge PWM
control. This voltage ramp, and PWM control
logic are governed by the internal oscillator
THEORY OF OPERATION
that accurately sets the PWM frequency to
900kHz.
The SP765 contains two unique control
features that are very powerful in distributed
applications. First, asynchronous driver con-
trol is enabled during startup, to prohibit the
low side NFET from pulling down the output
until the high side NFET has attempted to
turn on. Second, a 100% duty cycle timeout
ensures that the low side NFET is periodically
enhanced during extended periods at 100%
duty cycle. This guarantees the synchronized
refreshing of the BST capacitor during very
large duty ratios.
The SP765 also contains a number of
valuable protection features. Programmable
UVLO allows the user to set the exact V IN
value at which the conversion voltage can
Rev J: 3/ 4/07
SP765 Wide Input Voltage Range 3A, 900kHz, Buck Regulator
4
? Copyright 2007 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7651ER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7651ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 3A, 900kHz, Buck Regulator |
| SP7651ER-L | 功能描述:DC/DC 开关控制器 Buck Regulator RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP7651ER-L/TR | 功能描述:开关变换器、稳压器与控制器 WIDE INPUT VOLTAGE RANGE, 3A 900k RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP7652 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 6A, 600kHz, Buck Regulator |
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