- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384585 > L6726A (意法半導體) Single phase PWM controller PDF資料下載
參數(shù)資料
| 型號： | L6726A |
| 廠商： | 意法半導體 |
| 英文描述： | Single phase PWM controller |
| 中文描述： | 單相PWM控制器 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 399K |
| 代理商： | L6726A |
Soft start and disable
L6726A
12/24
6
Soft start and disable
L6726A implements a soft start to smoothly charge the output filter avoiding high in-rush
currents to be required from the input power supply. The device sources a 10μA soft start
current from COMP, linearly charging the compensation network capacitors. The ramping
COMP voltage is compared to the oscillator triangular waveform generating PWM pulses of
increasing width that charge the output capacitors.
When the FB voltage crosses 800 mV, the output voltage is in regulation: soft start phase
will end and the transconductance error amplifier output will be enabled closing the control
loop.
In the event of an over current during soft start, the over current logic will override the soft
start sequence and will shut down the PWM logic and both the high side and low side gates.
This condition is latched, cycle VCC to recover.
The device sources soft start current only when VCC power supply is above UVLO
threshold and over current threshold setting phase has been completed.
6.1
Low-Side-Less start up (LSLess)
L6726A performs a special sequence in enabling LS driver to switch: during the soft-start
phase, the LS driver results disabled (LS = OFF) until the HS starts to switch. This avoids
the dangerous negative spike on the output voltage that can happen if starting over a pre-
charged output and limits the output discharge (amount of output discharge depends on
programmed SS time length: the shorter the programmed SS, the more limited the output
discharge).
If the output voltage is pre-charged to a voltage higher than the final one, the HS would
never start to switch. In this case, LS is enabled and discharges the output to the final
regulation value.
Figure 5.
LSLess startup (left) vs. Non-LSLess startup (right)
6.2
Enable / Disable
The device can be disabled by pushing COMP / DIS pin under 0.4V (min). In this condition
HS and LS MOSFETs are turned off, and the 10
μ
A SS current is sourced from COMP / DIS
pin. Setting free the pin, the device enables again performing a new SS.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6726ATR | Single phase PWM controller |
| L6727 | Single phase PWM controller |
| L6727TR | Single phase PWM controller |
| L6730CQ | Adjustable step-down controller with synchronous rectification |
| L6730C | Adjustable step-down controller with synchronous rectification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6726A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller |
| L6726A_10 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller |
| L6726ATR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 PWM Controler Single RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6726-D18-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726G-D18-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
發(fā)布緊急采購，3分鐘左右您將得到回復。