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參數(shù)資料
| 型號： | L5953 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | MULTIPLE SWITCHING VOLTAGE REGULATOR |
| 中文描述： | 多重開關(guān)穩(wěn)壓 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 217K |
| 代理商： | L5953 |
L5953
10/24
set up by the external capacitor CT.
When the RES is switched on, HSD1, HSD2, REG2, PWM are turned off and until the RES is forced to zero
only the REG1 and low Voltage Warnings are active.
Low Voltage Warning(Figure 7)
This circuit is able to sense two different voltages through external resistors to increase the overall flexibility.
If S1 pin voltage is higher than Vst, the output mos M1 is off: W1 is floating and can be pulled up by an external
resistor. If S1 pin voltage goes down and becomes lower than Vst, the mos M1 is turned on and forces W1 to
zero. The same thing happens for S2 - W2.
The outputs W1 and W2 can be connected together to get a single output.
REG2 Linear Voltage Regulator (Figure 5)
REG2 is a linear voltage regulator with a dedicated supply pin VIN. The output voltage (between 1.5V and 3.3V)
is fixed by an external divider. It can be turned on/off by SPI. It has a current protection which limits the maximum
allowable output current.
High Side Drivers (Figure 8)
Two high-side driver with charge pump controlled by SPI are available inside L5953. They are protected against
short to ground: the short circuit potection limits the maximum output current.
A diagnostic procedure is available to detect open load, short to battery and overcurrent.
Open load and short to battery can be reveal only in test mode while overcurrent is active only during normal
operationof the device. (see OPERATION -page 13
PWM Step Down Voltage Regulator (Figure 9)
The switching regulator inside the L5953 is a voltage control mode (also known as "direct duty cycle") Buck reg-
ulator: the error signal coming from the error amplifier is compared with a sawtooth to set on and off times of the
power switch.
The feedforward control is introduced to get a quickly response to input voltage changes: the sawtooh has a
fixed frequency and an amplitude variable with the battery voltage.
Continuous mode operation is recommended in order to reduce the stress of the output capacitor and of the
free-wheeling diode.
Error amplifier and compensation network
The error amplifier (EA) is a voltage amplifier whose non-inverting input is fixed to the reference voltage (1.275V
bandgap voltage) and whose inverting input and output are externally available for feedback and frequency
compensation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| L5953_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multiple switching voltage regulator |
| L5954 | 功能描述:低壓差穩(wěn)壓器 - LDO Airbag App Specific Voltage Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L5955 | 功能描述:多媒體雜項(xiàng) Multifunction Voltage Regulator RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| L5956 | 功能描述:多媒體雜項(xiàng) Multifunction Voltage Regulator RoHS:否 制造商:Texas Instruments 類型: 通道數(shù)量: 轉(zhuǎn)換速率:540 Mbps 分辨率: 封裝 / 箱體:SOIC-16 封裝:Tube |
| L5956_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multifunction voltage regulator for car radio |
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