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参数资料
| 型号： | SP6123CN-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8NSOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 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： | 带卷 (TR) |
APPLICATIONS INFORMATION
V OUT = 0.8(1 + 1 )
Overcurrent Protection
Over current protection on the SP6123 is imple-
mented through detection of an excess voltage
condition across the high side switch during
conduction. This is typically referred to as high
side R DS(ON) detection. By using the R DS(ON) of
Q1 to measure the output current, the current
limit circuit eliminates the sense resistor that
would otherwise be required and the corre-
sponding loss associated with it. This improves
the overall efficiency and reduces the number of
components in the power path benefiting size
and cost. R DS(ON) sensing is by default inaccu-
rate and is primarily meant to protect the power
supply during a fault condition. The overcurrent
trip point will vary from unit to unit as the
R DS(ON) of MOSFET varies. The SP6123 pro-
vides a built-in 200mV threshold between the
V CC and SWN pins.
Output Voltage Program
As shown in Figure 5, the voltage divider con-
necting to the V FB pin programs the output
voltage according to
R
R 2
where 0.8V is the internal reference voltage.
Select R2 in the range of 10k to 100k, and R1 can
be calculated using
R 1 = R 2 (V OUT – 0.8)
0.8
V OUT
The overcurrent threshold can be calculated as
I MAX = 200mV
R DS(ON)
To ensure accurate current sensing, the V CC pin
should be connected directly to the drain of the
high side MOSFET. A RC filter on the V CC pin
is not recommended because it would artifi-
?
SP6123
V FB
R1
R2
cially alter the current signal and reduce the
overcurrent threshold from the value given by
the equation.
Figure 5. A voltage divider connected to the V FB pin
programs the output voltage.
Date: 9/13/04
SP6123 Low Voltage, Synchronous Step Down PWM Controller
15
? Copyright 2004 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6123EB | 功能描述:电源管理IC开发工具 Low Voltage, 8 Pin Sync Buck Controller 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 |
| SP6123EN-L | 制造商:Exar Corporation 功能描述:IC BUCK CONTROLLER LOW VOLT 300KHZ |
| SP6125 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6125EB | 功能描述:电源管理IC开发工具 Eval Board for SP6125 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 |
| SP6125EK1L | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
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