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参数资料
| 型号： | L6725A |
| 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： | SOP-16 |
| 文件页数： | 7/34页 |
| 文件大小： | 962K |
| 代理商： | L6725A |
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L6725 - L6725A
Device description
15/32
5.9
Hiccup mode
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 cannot 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:
5.10
Thermal shutdown
When the junction temperature reaches 150°C ±10°C the device enters in thermal shutdown.
Both MOSFETs are turned OFF and the soft-start capacitor is rapidly discharged with an
internal switch. The device does not restart until the junction temperature goes down to 120°C
and, in any case, until the voltage at the soft-start pin reaches 500mV.
Figure 9.
Constant current and Hiccup Mode during an OCP.
VSS
VCOMP
IL
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
,
+
=
(1)
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| L6725ATR | 功能描述:开关变换器、稳压器与控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6725TR | 功能描述:电压模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6726 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_08 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_12 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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