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參數(shù)資料
| 型號： | L6730DTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Adjustable step-down controller with synchronous rectification |
| 中文描述： | 可調(diào)式降壓同步整流控制器 |
| 文件頁數(shù)： | 22/50頁 |
| 文件大?。?/td> | 1394K |
| 代理商： | L6730DTR |
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Device description
L6730C - L6730D
22/50
The L6730D can always sink current and so the OVP will operate always in advance. 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 3: Pins connection
):
Peak Current Limit
Valley Current Limit
●
●
The Peak Current Protection is active when the high-side MOSFET(s) is turned on, after an
adjustable masking time (see
Chapter 5.10 on page 25
). The valley-current-protection is
enabled when the low-side MOSFET(s) is turned on after a fix masking time of about 400ns. 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 (L6730C): the high-side and low-side MOSFET(s) are turned off, the soft-start
capacitor is discharged with a constant current of 10μA and when the voltage at the SS pin
reaches 0.5V the soft-start phase restarts. During the soft-start phase the OCP provides a
constant-current-protection. If during the T
ON
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 (see
Chapter 5.9: Adjustable masking time on
page 25
) because during the masking time the peak-current-protection is disabled. In case of
very hard short circuit, even with this short T
ON
, 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:
In constant current protection a current control loop limits the value of the error amplifier’s
output (comp), in order to avoid its saturation and thus recover faster when the output returns in
regulation.
Figure 16.
shows the behaviour of the device during an over current condition that
persists also in the soft-start phase.
Figure 15. OVP with sink disabled: delay on the OVP operation.
126%
V
OUT
V
FB
LGate
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
I
,
+
=
(4)
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| L6730 | Adjustable step-down controller with synchronous rectification |
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| L6730BTR | Adjustable step-down controller with synchronous rectification |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6730TR | 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 |
| L6731B | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Adj. Step-Down w/ Synch Rectification 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 |
| L6731BTR | 功能描述:IC CTRLR ADJ STEP DOWN 16-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| L6731D | 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 |
| 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 |
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