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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： | 6/34页 |
| 文件大小： | 962K |
| 代理商： | L6725A |
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Device description
L6725 - L6725A
14/32
5.7
Driver section
The high-side and low-side drivers allow using different types of power MOSFETs (also multiple
MOSFETs to reduce the RDSON), maintaining fast switching transitions. The low-side driver is
supplied by VCCDR while the high-side driver is supplied by the BOOT pin. A predictive dead
time control avoids MOSFETs cross-conduction maintaining very short dead time duration in
the range of 20ns. The control monitors the phase node in order to sense the low-side body
diode recirculation. If the phase node voltage is less than a certain threshold (-350mV typ.)
during the dead time, it will be reduced in the next PWM cycle. The predictive dead time control
doesn’t work when the high-side body diode is conducting because the phase node doesn’t go
negative. This situation happens when the converter is sinking current for example and, in this
case, an adaptive dead time control operates.
5.8
Monitoring and protections
The output voltage is monitored by means of pin FB. The device provides over-voltage-
protection: when the voltage sensed on FB pin reaches a value 20% (typ.) greater than the
reference the low-side driver is turned on as long as the over voltage is detected (see Figure 8).
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: Pin functions):
●
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 100ns. The valley-current-protection is enabled when the low-side MOSFET(s)
is turned on after a masking time of 500ns. 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 10A and when
the voltage at the SS pin reaches 0.5V the soft-start phase restarts (see Figure 9).
Figure 8.
OVP
LGate
FB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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