參數(shù)資料
型號： L6732TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁數(shù)： 10/37頁
文件大小： 898K
代理商： L6732TR
Device description
L6732
18/37
Equation 4
During soft-start the OC acts in constant current mode: a current control loop limits the value
of the error amplifier output (comp), in order to avoid its saturation and thus recover faster
when the output returns in regulation. Figure 12. shows the behavior of the device during an
over current condition that persists also in the soft-start phase.
L6732 provides under voltage (UV) protection: when the voltage on FB pin falls below 80 %
of the reference, the IC will enter HICCUP mode.
Feedback disconnection is also provided by sourcing a 100 nA current from FB pin. if FB
results being floating, the IC will detect and OV so latching its condition with Low Side
MOSFET firmly ON
5.9
Thermal shutdown
When the junction temperature reaches 150 °C ±10 °C the device enters in thermal
shutdown. Both MOSFETs are turned off and the soft-start capacitor is rapidly discharged
with an internal switch. The device doesn't restart until the junction temperature goes down
to 120 °C and, in any case, until the voltage at the soft-start pin reaches 500 mV.
5.10
Synchronization
The presence of many converters on the same board can generate beating frequency noise.
To avoid this it is important to make them operate at the same switching frequency.
Moreover, a phase shift between different modules helps to minimize the RMS current on
the common input capacitors. Figure 13 and Figure 14 shows the results of two modules in
synchronization. Two or more devices can be synchronized simply connecting together the
SYNCH pins. The device with the higher switching frequency will be the Master while the
Figure 12.
Constant current and hiccup mode during an OCP
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
,
+
=
VSS
VCOMP
IL
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6733 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6733TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6738 功能描述:電流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738A 功能描述:電流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738ATR 功能描述:電流型 PWM 控制器 Single Phase PWM CNTRL Light-Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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