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| 型号： | SP6123ACN-L |
| 厂商： | Exar Corporation |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8NSOIC |
| 标准包装： | 98 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 93% |
| 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： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
OPERATION
Over Current Protection
Over current protection on the SP6123 is imple-
mented through detection of an excess voltage
condition across the high side NMOS switch dur-
ing 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 com-
parator charges an internal sampling capacitor
each time V(V CC )-V(SWN) exceeds the 200mV
(typ) internal threshold and the GH voltage is high.
The discharge/charge current ratio on the sam-
pling capacitor is about 2%. Therefore, provided
that the over current condition persists, the capaci-
lems in the external MOSFETs.
The following figure shows typical waveforms
for the output drivers.
As with all synchronous designs, care must be
taken to ensure that the MOSFETs are properly
chosen for non-overlap time, enhancement gate
drive voltage, “on” resistance R DS(ON) , reverse
transfer capacitance Crss, input voltage and
maximum output current.
tor voltage will be pumped up during each time GH
switches high. This voltage will trigger an over
current condition upon reaching a CMOS inverter
5V
GATE DRIVER TEST CONDITIONS
90 %
threshold. There are many advantages to this
approach. First, the filtering action of the gated
scheme protects against false and undesirable trig-
GH(GL)
10 %
5V
2V
FALL TIME
90 %
gering that could occur during a minor transient
overload condition or supply line noise. Further-
more, the total amount of time to trigger the fault
GL(GH)
2V
RISE TIME
10 %
depends on the on-time of the high side NMOS
switch. Fifteen, 1 μ s pulses are equivalent to thirty,
500ns pulses or one, 15 μ s pulse, however, depend-
ing on the period, each scenario takes a different
amount of total time to trigger a fault. Therefore,
the fault becomes an indicator of average power in
the high side switch. The 200mV overcurrent
threshold has a 3400 ppm/ ° C temperature coeffi-
cients in an effort to first order match the thermal
characteristics of the R DS(ON) of the high side
NMOS switch. It assumed that the SP6123 will be
used in compact designs where there is a high
amount of thermal coupling between the high side
switch and the controller.
Output Drivers
The SP6123, unlike some other bipolar control-
ler IC’s, incorporates gate drivers with rail-to-
rail swing that help prevent spurious turn on due
to capacitive coupling. The driver stage consists
V(BST)
GH
Voltage
0V
V(VCC)
GL
Voltage
0V
V(VCC=VIN)
SWN
Voltage
~0V
- V(Diode) V
~ 2*V(VIN)
BST
Voltage
NON-OVERLAP
of one high side NMOS, 4 ? driver, GH, and one
low side, 4 ? , NMOS driver, GL, optimized for
driving external power MOSFET’s in a syn-
chronous buck topology. The output drivers
also provide gate drive non-overlap mechanism
that provides a dead time between GH and GL
transitions to avoid potential shoot-through prob-
~ V(VIN)
TIME
Date: 9/13/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
8
? Copyright 2004 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6123ACN-L/TR | 功能描述:电压模式 PWM 控制器 Low Voltage, Micro 8 Synchronous, Cntrllr 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 |
| SP6123AEN-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP6123CN | 制造商:Exar Corporation 功能描述:Swithed-Mode Power Supply Controller, Voltage Mode Type, 8 Pin, Plastic, SOP |
| SP6123CN/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 |
| SP6123CN-L | 功能描述:电压模式 PWM 控制器 Low Voltage, Micro 8 Synchronous, Cntrllr 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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