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參數(shù)資料
| 型號： | L6731D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | HTSSOP-16 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 386K |
| 代理商： | L6731D |
Device description
L6731D
14/23
low-side will turn-on before the output voltage exceeds the over-voltage threshold, because
the error amplifier will throw off balance in advance. Even if the device doesn't report an
over-voltage, the behavior is the same, because the low-side is turned-on immediately. The
following figure shows the device behavior during an over-voltage event. The output voltage
rises with a slope of 100 mV/s, emulating in this way the breaking of the high-side
MOSFET as an over-voltage cause.
The device realizes the over-current-protection (OCP) sensing the current both on the high-
side MOSFET(s) and the low-side MOSFET(s) and so 2 current limit thresholds can be set
(see OCH pin and OCL pin in Table 4. Pins function):
●
Peak current limit
●
Valley current limit
The peak current protection is active when the high-side MOSFET(s) is turned on, after a
masking time of about 100 ns. The valley-current-protection is enabled when the low-side
MOSFET(s) is turned on after a masking time of about 400 ns. If, when the soft-start phase
is completed, an over current event occurs during the on time (peak-current-protection) or
during the off time (valley-current-protection) the device enters in HICCUP mode: the high-
side and low-side MOSFET(s) are turned OFF, the soft-start capacitor is discharged with a
constant current of 10 A and when the voltage at the SS pin reaches 0.5 V the soft-start
phase restarts. During the soft-start phase the OCP provides a constant-current-protection.
If during the TON the OCH comparator triggers an over current the high-side MOSFET(s) is
immediately turned OFF (after the masking time and the internal delay) and returned on at
the next PWM cycle. The limit of this protection is that the TON can't be less than masking
time plus propagation delay because during the masking time the peak-current-protection is
disabled. In case of very hard short circuit, even with this short TON, the current could
escalate.
The valley-current-protection is very helpful in this case to limit the current. If during the off-
time the OCL comparator triggers an over current, the high-side MOSFET(s) is not turned
on until the current is over the valley-current-limit.
This implies that, if it is necessary, some pulses of the high-side MOSFET(s) will be skipped,
guaranteeing a maximum current due to the following formula:
Figure 8.
OVP: the low-side MOSFET is turned-on in advance
VOUT
VFB
LGate
109%
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|---|---|
| L6731DTR | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| L6732 | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| L6732_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732_0906 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732C | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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