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| 型号： | L6712AQ |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, QCC36 |
| 封装： | 6 X 6 MM, 1 MM HEIGHT, VFQFPN-36 |
| 文件页数： | 17/29页 |
| 文件大小： | 624K |
| 代理商： | L6712AQ |
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L6712A L6712
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implemented) or in the same way to the LS mosfets Source pin. GATEx and PHASEx connections (and
also PGND when no power ground plane is implemented) must also be designed to handle current peaks
in excess of 2A (30 mils wide is suggested).
Gate resistors of few ohms help in reducing the power dissipated by the IC without compromising the sys-
tem efficiency.
The placement of other components is also important:
– The bootstrap capacitor must be placed as close as possible to the BOOTx and PHASEx pins to min-
imize the loop that is created.
– Decoupling capacitor from VCC and SGND placed as close as possible to the involved pins.
– Decoupling capacitor from VCCDR and PGND placed as close as possible to those pins. This capac-
itor sustains the peak currents requested by the low-side mosfet drivers.
– Refer to SGND all the sensible components such as frequency set-up resistor (when present) and
Remote Amplifier Divider.
– Connect SGND to PGND plane on a single point to improve noise immunity. Connect at the load side
(output capacitor) if Remote Sense is not implemented to avoid undesirable load regulation effect.
– An additional 100nF ceramic capacitor is suggested to place near HS mosfet drain. This helps in re-
ducing noise.
– PHASE pin spikes. Since the HS mosfet switches in hard mode, heavy voltage spikes can be ob-
served on the PHASE pins. If these voltage spikes overcome the max breakdown voltage of the pin,
the device can absorb energy and it can cause damages. The voltage spikes must be limited by prop-
er layout, the use of gate resistors, Schottky diodes in parallel to the low side mosfets and/or snubber
network on the low side mosfets, to a value lower than 26V, for 20ns, at FSW of 600kHz max.
– Boot Capacitor Extra Charge. Systems that do not use Schottky diodes in parallel to the LS mosfet
might show big negative spikes on the phase pin. This spike can be limited as well as the positive
spike but has an additional consequence: it causes the bootstrap capacitor to be over-charged. This
extra-charge can cause, in the worst case condition of maximum input voltage and during particular
transients, that boot-to-phase voltage overcomes the abs. max. ratings also causing device failures.
It is then suggested in this cases to limit this extra-charge by:
– adding a small resistor in series to the boot diode (one resistor can be enough for all the diodes if
placed upstream the diode anode)
– using low capacitance diodes.
Figure 20. Device orientation (left) and sense nets routing (right).
■ Sense Connections.
Remote Amplifier: Place the external resistors near the device to minimize noise injection and refer to
SGND. The connections for these resistors (from the remote load) must be routed as parallel nets in order
to compensate losses along the output power traces and also to avoid the pick-up of any noise. Connect-
ing these pins in points far from the load will cause a non-optimum load regulation, increasing output tol-
Towards HS mosfet
(30 mils wide)
Towards LS mosfet
(30 mils wide)
Towards HS mosfet
(30 mils wide)
To LS mosfet
(or sense resistor)
To regulated output
ST L6917
To LS mosfet
(or sense resistor)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6712AQTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712D | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712DTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712Q | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
| L6712QTR | 功能描述:开关变换器、稳压器与控制器 2-Ph Interleaved 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 |
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