参数资料
| 型号： | SP6128ASEY-L |
| 厂商： | Exar Corporation |
| 文件页数： | 7/10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
A more detailed description of the waveform is shown below.
SP6128A OVER CURRENT (HICCUP MODE)
Test Conditions
V FB = 0.7V
V CC = PV CC = 5.0V
BST = 5.0V
SWN - tied to GND through 1k Resistor
COMP – released from GND
Overcurrent Detected
G H Turns Off
Fault Mode Enabled
Internal SSTART rises until
~ V CC -1V, then gives command
to attempt RESTART
G H
COMP Clamps
~ 3V
COMP
After pop, COMP
ENABLE
Part
retains internal
SSTART slope
Attempt
RESTART
5 μ A PULLUP slope to 0.3V;
35 μ A PULLUP to 0.7V
Internal SSTART
passes V(V FB ), COMP
pops to ~ internal
SSTART voltage +0.7V
Over Current Protection
Over current protection on the SP6128A is imple-
mented through detection of an excess voltage
condition across the high side NMOS switch
during conduction. This is typically referred to
as high side R DS(ON) detection and eliminates the
need of an external sense resistor. The over
current comparator charges an internal sam-
pling capacitor each time V SWN is lower than
(V ISET - 140mV) and the GH voltage is high. The
discharge/charge current ratio on the sampling
capacitor is about 2%. Therefore, provided that
the over current condition persists, the capacitor
voltage will be pumped up during each time GH
switches high. This voltage will trigger an over
current condition upon reaching a CMOS in-
verter threshold. There are many advantages to
this approach. First, the filtering action of the
gated scheme protects against false and undesir-
able triggering that could occur during a minor
transient overload condition or supply line noise.
Furthermore, the total amount of time to trigger
the fault depends on the on-time of the high side
NMOS switch. Fifteen, 1 μ s pulses are equiva-
lent to thirty, 500ns pulses or one, 15 μ s pulse,
however, depending on the period, each sce-
nario takes a different amount of total time to
trigger a fault. Therefore, the fault becomes an
indicator of average power in the high side
Rev. 08/19/05
SP6128A Low Voltage, Synchronous Step Down PWM Controller
7
? Copyright 2005 Sipex Corporation
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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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