- 您现在的位置：买卖IC网 > PDF目录67755 > L6731D (STMICROELECTRONICS) 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 PDF资料下载
参数资料
| 型号： | L6731D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | HTSSOP-16 |
| 文件页数： | 6/23页 |
| 文件大小： | 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%
相关PDF资料 |
PDF描述 |
|---|---|
| L9230-DIE1 | STEPPER MOTOR CONTROLLER, UUC |
| L9230 | STEPPER MOTOR CONTROLLER, PDSO20 |
| LA5680T | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQFP48 |
| LA5681T | SWITCHING CONTROLLER, 520 kHz SWITCHING FREQ-MAX, PQFP48 |
| LA79500E | 6-CHANNEL, VIDEO MULTIPLEXER, QFP80 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6731DTR | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6732 | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6732_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732_0906 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6732C | 功能描述:DC/DC 开关控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。