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参数资料
| 型号： | L6730 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | HTSSOP-20 |
| 文件页数： | 18/52页 |
| 文件大小： | 1569K |
| 代理商： | L6730 |
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L6730 - L6730B
Device description
Doc ID 11938 Rev 3
25/52
enters in HICCUP mode (L6730): 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 (see Chapter 5.9: Adjustable
masking time on page 27) 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:
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 19 shows the behaviour of the device during an over current
condition that persists also in the soft-start phase.
Using the L6730B there is the possibility to set the constant-current-protection also after the
soft-start. The following figures show the behaviour of the L6730B during an overcurrent
event.
Figure 20 shows the intervention of the peak OCP: the high-side MOSFET(s) is turned-off
when the current exceeds the OCP threshold. In this way the duty-cycle is reduced, the
VOUT is reduced and so the maximum current can be fixed even if the output current is
escalating. Figure 21 shows the limit of this protection: the on-time can be reduced only to
the masking time and, if the output current continues to increase, the maximum current can
increase too. Notice how the Vout remains constant even if the output current increases
because the on-time cannot be reduced anymore.
Figure 19.
Constant current and hiccup mode during an OCP (L6730)
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
,
+
=
(4)
VSS
VCOMP
IL
相关PDF资料 |
PDF描述 |
|---|---|
| L6730B | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6730TR | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6732CTR | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6732 | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6732TR | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6730_09 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
| L6730B | 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 |
| L6730BTR | 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 |
| L6730C | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:100% 电源电压:8.2 V ~ 30 V 降压:无 升压:无 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:0°C ~ 70°C 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 产品目录页面:1316 (CN2011-ZH PDF) |
| L6730CQ | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification |
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