参数资料
| 型号： | SP6128ASEY-L |
| 厂商： | Exar Corporation |
| 文件页数： | 6/10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 |
OPERATION: continued
As the figure shows, the SS voltage controls a
variety of signals. First, provided all the exter-
nal fault conditions are removed, an internal
5 μ A pull-up at the COMP pin brings the
SP6128A out of shutdown mode. The internal
timing circuit is then activated and controls the
ramp-up of the error amp reference voltage. The
COMP pin is pulled to 0.7V by the internal
clamp and then gradually charges preventing
the error amplifier from forcing the loop to
maximum duty cycle. As the COMP voltage
crosses about 1V (valley voltage of the PWM
ramp), the driver begins to switch the high side
MOSFET with narrow pulses in an effort to
keep the converter output regulated . The
SP6128A operates at low duty cycle as the
COMP voltage increases above 1V. As the error
amp reference ramps upward, the driver pulses
widen until a steady state value is reached and
the output voltage is regulated to the final value
ending the soft start charge cycle.
Hiccup Mode
When the converter enters a fault mode, the
SP6128A holds the high side and low side
MOSFETs off for a finite period of time. Provided
that the SP6128A is enabled, this time is set by the
internal charge of the soft-start capacitor. In the
event of an overcurrent condition, the current
sense comparator sets the fault latch, which in turn
discharge the internal SS capacitor, the COMP pin
and holds the output drivers off. During this con-
dition, the SP6128A stays off for the time it takes
to discharge the COMP pin down to the 0.29V
shutdown threshold. At this point, the fault latch
is reset, but before the SP6128A is allowed to
attempt restart, the COMP pin has to charge back
to 1V before any output switching can be initiated.
Then, the regulator attempts to restart normally by
delivering short gate pulses and if the overcurrent
condition is still present, the cycle will repeat itself.
However, if upon restart, the overcurrent condi-
tion is still present, the SP6128A will detect the
fault and remain in a fault state until the internal
soft start voltage reaches about V CC -1V thereby
increasing the MOSFET off-time. This protection
scheme minimizes thermal stress to the regulator
components as the overcurrent condition persists.
COMP
1V
0.7 V
0.3 V
0V
Internal SS
Voltage
Error Amp
Reference
Voltage
0.8 V
0V
I(L)
Inductor
Current
0A
V(V CC )
FAULT
0V
V(V CC )
SWN
Voltage
0V
TIME
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller
6
? Copyright 2005 Sipex Corporation
相关PDF资料 |
PDF描述 |
|---|---|
| SP6132HEU-L | IC REG CTRLR BUCK PWM VM 10-MSOP |
| SP6133ER1-L/TR | IC REG CTRLR BUCK PWM VM 16-QFN |
| SP6134HEU-L | IC REG CTRLR BUCK PWM VM 10-MSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6128ASEY-L/TR | 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 |
| SP6128EB | 功能描述:电源管理IC开发工具 Eval Board for SP6128 Series RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| SP613 | 制造商:Power-One 功能描述: |
| SP6132 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input, 300KHz Synchronous PWM Controller |
| SP6132ACU | 制造商:Exar Corporation 功能描述:SMPS CONTROLLER |
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