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| 型号： | SP7656EB |
| 厂商： | Exar Corporation |
| 文件页数： | 4/10页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP7656 |
| 标准包装： | 1 |
| 系列： | * |
f DBPOLE ?
CZ ?
SP7656 General Overview:
The SP7656 PowerBlox is a fixed frequency,
voltage mode, non-synchronous PWM
controller co-packaged with a P-Channel FET.
SP7656 is optimized for minimum component,
small form factor and cost effectiveness. It has
been designed for single-supply operation
ranging from 4.5V to 29V. SP7656 has Type-2
internal compensation for use with
Electrolytic/Tantalum output capacitors. For
ceramic capacitors Type-3 compensation can
be implemented by simply adding an R and C
between output and Feedback.
A precision 0.6V reference, present on the
positive terminal of the internal error amplifier,
permits programming of the output voltage
down to 0.6V via the FB pin. The output of the
Error Amplifier is internally compared to a
feed-forward (V IN /5 peak-to-peak) ramp and
generates the PWM control.
Timing is governed by an internal oscillator
that sets the PWM frequency at 600kHz.
1
2 ? L C OUT
Creating a Type-3 compensation Network
The above condition requires the ESR zero to
be at a lower frequency than the double-pole
from the LC filter. If this condition is not met,
Type-3 compensation should be used and can
be accomplished by placing a series RC
combination in parallel with R1 as shown
below. The value of CZ can be calculated as
follows and RZ selected from table 1.
L C
R 1
f ESRZERO /f DBPOLE RZ
1X 50K
2X 40K
3X 30K
5X 10K
SP7656 contains useful protection features.
Over-current protection is based on the
internal MOSFET Rds(on) and is
programmable via a resistor placed between
I SET and LX node. Under-Voltage Lock-Out
(UVLO) ensures that the controller starts
functioning only when sufficient voltage exists
for powering IC’s internal circuitry.
>= 10X 2K
Table1- RZ Selection
SP7656
CP1 2pF
RZ
Vout
SP7656 Loop Compensation
CZ
The SP7656 includes Type-2 internal
compensation components for loop
compensation. External compensation
components are not required for systems with
tantalum or aluminum electrolytic output
capacitors with sufficiently high ESR. Use the
condition below as a guideline to determine
whether or not the internal compensation is
sufficient for your design. Type-2 internal
compensation is sufficient if the following
condition is met:
f ESRZERO ? f DBPOLE
where:
1
f ESRZERO ?
2 ? R ESR C OUT
CZ2 130pF RZ2 200k
FB
Vref =0.6V
Error Amplif ier
Figure 1- RZ and CZ in conjunction with internal
compensation components form a Type-3
compensation
R1
200k, 1%
R2
11/07/08 SP7656 PowerBlox
4
? Copyright 2008 EXAR Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7656EN2-L | 功能描述:开关变换器、稳压器与控制器 NonSync 600kHz High Input DC/DC Volt Reg 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 |
| SP7656EN2-L/TR | 功能描述:开关变换器、稳压器与控制器 600KHZ HIGH INPUT NON-SYNC STEP DWN 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 |
| SP7661 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7661_07 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 3A, 600kHz, Buck Regulator |
| SP7661_1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
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