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參數(shù)資料
| 型號： | L6725TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Low cost adjustable step-down controller |
| 中文描述： | 低成本可調(diào)降壓控制器 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大小： | 489K |
| 代理商： | L6725TR |
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L6725
Device description
13/27
The output of the error amplifier is clamped with this voltage (V
SS
) until it reaches the
programmed value. No switching activity is observable if V
SS
is lower than 0.5V and both
MOSFETs are OFF. When V
SS
is between 0.5V and 1.1V the low-side MOSFET is turned ON.
As V
SS
reaches 1.1V (i.e. the oscillator triangular wave inferior limit) even the high-side
MOSFET begins to switch and the output voltage starts to increase. During the soft-start phase
the current can’t be reversed in order to allow pre-biased start-up (see
Figure 6.
and
Figure 7.
).
If an over current is detected during the soft-start phase, the device provides a constant-
current-protection. In this way, in case of short soft-start time and/or small inductor value and/or
high output capacitors value, the converter can start in any case, limiting the current
(
Chapter 5.8: Monitoring and protections on page 14
). The soft-start phase ends when Vss
reaches 3.5V. After that the over-current-protection triggers the HICCUP mode.
Figure 6.
Start-up without pre-bias
Figure 7.
Start-up with pre-bias
LGate
V
OUT
I
L
V
SS
V
SS
I
L
V
OUT
LGate
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6728 | Single phase PWM controller with PowerGOOD |
| L6728TR | Single phase PWM controller with PowerGOOD |
| L6731B | Transistor; Type: Amplifiers/Bipolar; VCEO (V): 25; Ic (A): 1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: 0.5; Package: TO-92Mod |
| L6731BTR | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -25; Ic (A): -1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
| L6732 | Adjustable step-down controller with synchronous rectification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6726 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_08 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_12 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726A | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Sngl phase PWM controller 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6726A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller |
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