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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： | 2/35页 |
| 文件大小： | 431K |
| 代理商： | L6918D |
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L6918 L6918A
10/35
DEVICES DESCRIPTION
The devices are integrated circuit realized in BCD technology. They provide, in kit, a complete control logic and
protections sets for a high performance four-phases step-down DC-DC converter optimized for microprocessors
supply and High Density DC-DC converters. They are designed to drive N-Channel mosfets in an interleaved
four-phase synchronous-rectified buck topology. Each controller provides a 180 deg phase shift between its two
phases and a 90deg phase-shifted synchronization signal is passed from the master to the slave controller that
locks the signal through a PLL. The resulting four-phases converter synchronized together results in a 90 deg
phase shift on each phase, allowing a consistent reduction of the input capacitors ripple current, minimizing also
the size and the power losses. The output voltage of the converter can be precisely regulated, programming the
master’s VID pins, from 1.100V to 1.850V with 25mV binary steps. The reference for the regulation is passed
from the master device to the slave device through apposite pin likewise the synchronization signal. Each device
provides an average current-mode control with fast transient response. They include a 300kHz free-running os-
cillator externally adjustable up to 600kHz, realized in order to multiply by 4 times the equivalent system fre-
quency. The error amplifier features a 15MHz gain-bandwidth product and 10V/
s slew rate that permits high
converter bandwidth for fast transient performances. Current information is read in all the devices across the
lower mosfets RDSON or across a sense resistor in fully differential mode. The current information corrects the
PWM output in order to equalize the average current carried the two phases of each device. Current sharing
between the two phases of each device is then limited at
±10% over static and dynamic conditions. Current
sharing between devices is assured by the droop function. The device protects against over-current, with an
OCP threshold for each phase, entering in constant current mode. Since the current is read across the low side
mosfets, the constant current keeps constant the bottom of the inductors current triangular waveform. When an
under voltage is detected the Slave device latches. The Slave device also perform an over voltage protection
that disable immediately both devices turning ON the lower driver and driving high the FAULT pin. Over Load
condition are transmitted from the Slave device(s) to the master through the SLAVE_OK line.
MASTER - SLAVE INTERACTIONS
Figure 1. Four Phase connection with L6918 family
Master and slave devices are connected together in order to realize four-phase high performance step-down
DC/DC converter. Four-phase converter is implemented using L6918A master and one L6918 slave devices as
shown in figure 1.
A communication bus is implemented among all the controllers involved in the regulation. This bus consists in
the following lines:
– Reference (VPROG_IN / VPROG_OUT pins):Unidirectional line.
The devices share the reference for the regulation. The reference is programmed through the master
device VID pins. It exits from the master through the VPROG_OUT pin and enters the slave device
through the VPROG_IN pin(s). Filter externally with at least 1nF capacitor.
L6918A
L6918
VID 9.0
SYNC_OUT
VPROG _O UT
SLAV E_OK
OSC
SYNC_I N
VPROG_IN
SLAV E_OK
OSC
SYNC_O UT
SLAVE
CONTROLLER
MASTER
CONTROLLER
P GOOD
PGOOD
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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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