參數(shù)資料
型號(hào)： L6732TR
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)： 17/33頁
文件大?。?/td> 735K
代理商： L6732TR
L6732
Device description
17/33
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 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 100ns. The valley-current-protection is enabled when the low-side
MOSFET(s) is turned on after a 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: 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 T
ON
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 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 output
(comp), in order to avoid its saturation and thus recover faster when the output returns in
regulation.
Figure 12.
shows the behaviour of the device during an over current condition that
persists also in the soft-start phase.
Figure 11. OVP: the low-side MOSFET is turned-on in advance.
V
OUT
V
FB
LGate
109%
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
I
,
+
=
(4)
相關(guān)PDF資料
PDF描述
L6902D013TR RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
L6902D RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
L6910 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
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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