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参数资料
| 型号： | SP6128AEY-L |
| 厂商： | Exar Corporation |
| 文件页数： | 4/10页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 14TSSOP |
| 标准包装： | 94 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 90% |
| 电源电压： | 3 V ~ 5.5 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： | 14-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
FUNCTIONAL DIAGRAM
Reference
0.8V
1V
-
+
DRIVER ENABLE
-
2 PV CC
FAULT
GM
350mV
+
SHUTDOWN
14 BST
V FB 10
0.27V/ms
SOFTSTART
+
-
ERROR
AMP
5 μ A
PWM COMP
-
+
RESET
Dominant
R
Q
PWM
Logic
Synchronous
Driver
13 GH
1 GL
COMP 6
V CC 3
S
12 SWN
4 PGND
I SET 11
2.8V ON
2.7V OFF
GH
15 μ A
+
-
+
UVLO
750mV RAMP
Over Current
SHUTDOWN
F = 300kHz
Reset
Dominant
S
Q
R
FAULT
COMP
5 GND
SWN
-
OPERATION
General Overview
The SP6128A is a constant frequency, voltage
mode, synchronous PWM controller designed
for low voltage, DC/DC step down converters.
It is intended to provide complete control for a
high power, high efficiency, precisely regulated
output voltage from a highly integrated 14-pin
solution.
The internal free-running oscillator accurately
sets the PWM frequency at 300kHz without
requiring any external elements and allows the
use of physically small, low value external com-
ponents without compromising performance. A
transconductance amplifier is used for the error
amplifier, which compares an attenuated sample
of the output voltage with a precision, 0.8V
reference voltage. The output of the error ampli-
fier (COMP), is compared to a 0.75V peak-to-
peak ramp waveform to provide PWM control.
The COMP pin provides access to the output of
the error amplifier and allows the use of external
components to stabilize the voltage loop.
High efficiency is obtained through the use of
synchronous rectification. Synchronous regula-
tors replace the catch diode in the standard buck
converter with a low R DS(ON) N-channel
MOSFET switch allowing for significant ef-
ficiency improvements. The SP6128A in-
cludes two fast MOSFET drivers with inter-
nal non-overlap circuitry and drives a pair of
N-channel power transistors. The SP6128A
includes an internal 0.27V/ms soft-start cir-
cuit that provides controlled ramp up of the
output voltage, preventing overshoot and in-
rush current at power up.
Current limiting is implemented by monitoring
the voltage drop across the R DS(ON) of the high
side N-channel MOSFET while it is conducting,
thereby eliminating the need for an external
sense resistor. The overcurrent threshold can be
programmed by a single resistor.
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller
4
? Copyright 2005 Sipex Corporation
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相关代理商/技术参数 |
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|---|---|
| SP6128AEY-L/TR | 功能描述:电压模式 PWM 控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SP6128AHY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128AHY/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128AHY-L | 功能描述:开关变换器、稳压器与控制器 Low Voltage Synchronous 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 |
| SP6128AHY-L/TR | 功能描述:电压模式 PWM 控制器 Low Voltage Synchronous Step Dwn RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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