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参数资料
| 型号： | L6918D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 18/35页 |
| 文件大小： | 431K |
| 代理商： | L6918D |
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L6918 L6918A
Power Connections.
These are the connections where switching and continuous current flows from the input supply towards the load.
The first priority when placing components has to be reserved to this power section, minimizing the length of
each connection as much as possible.
To minimize noise and voltage spikes (EMI and losses) these interconnections must be a part of a power plane
and anyway realized by wide and thick copper traces. The critical components, i.e. the power transistors, must
be located as close as possible, together and to the controller. Considering that the ”electrical” components re-
ported in figure are composed by more than one ”physical” component, a ground plane or ”star” grounding con-
nection is suggested to minimize effects due to multiple connections.
Fig. 16a shows the details of the power connections involved and the current loops. The input capacitance
(CIN), or at least a portion of the total capacitance needed, has to be placed close to the power section in order
to eliminate the stray inductance generated by the copper traces. Low ESR and ESL capacitors are required.
Figure 16. Power connections and related connections layout guidelines (same for both phases).
Power Connections Related.
Fig.16b shows some small signal components placement, and how and where to mix signal and power ground planes.
The distance from drivers and mosfet gates should be reduced as much as possible. Propagation delay times as
well as for the voltage spikes generated by the distributed inductance along the copper traces are so minimized.
In fact, the further the mosfet is from the device, the longer is the interconnectinggate trace and as a consequence,
the higher are the voltage spikes corresponding to the gate PWM rising and falling signals. Even if these spikes
are clamped by inherent internal diodes, propagation delays, noise and potential causes of instabilities are intro-
duced jeopardizing good system behavior. One important consequence is that the switching losses for the high
side mosfet are significantly increased.
For this reason, it is suggested to have the device oriented with the driver side towards the mosfets and the GATEx
and PHASEx traces walking together toward the high side mosfet in order to minimize distance (see fig 17). In
addition, since the PHASEx pin is the return path for the high side driver, this pin must be connected directly to
the High Side mosfet Source pin to have a proper driving for this mosfet. For the LS mosfets, the return path is the
PGND pin: it can be connected directly to the power ground plane (if 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 imple-
mented) must also be designed to handle current peaks in excess of 2A (30 mils wide is suggested).
VIN
LOAD
HS
Rgate
LS
Rgate
HGATEx
PHASEx
LGATEx
PGNDx
CIN
COUT
L
D
CBOO Tx
VIN
LOAD
HS
LS
BOOTx
PHASEx
VCC
SGND
CIN
COUT
L
D
+VCC
CVCC
a. PCB power and ground planes areas
b. PCB small signal components placement
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6918DTR | 功能描述:DC/DC 开关控制器 Prog Multi-Phase Cnt 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 |
| L6919 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| L6919C | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT |
| L6919CD | 功能描述:DC/DC 开关控制器 Prog Dual-Phase Cont 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 |
| L6919CDTR | 功能描述:DC/DC 开关控制器 Prog Dual-Phase Cont 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 |
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