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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： | 7/35页 |
| 文件大小： | 431K |
| 代理商： | L6918D |
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15/35
L6918 L6918A
Since the current is read in differential mode, also negative current information is kept; this allow the device to
check for dangerous returning current between the two phases assuring the complete equalization between the
phase’s currents.
Figure 5. Current reading timing (left) and circuit (right)
From the current information for each phase, information about the total current delivered ( IFB=IINFO1+IINFO2 )
and the average current for each phase ( IAVG=(IINFO1+IINFO2)/2 ) is taken. IINFOX is then compared to IAVG to
give the correction to the PWM output in order to equalize the current carried by the two phases.
The transconductance resistor Rg can be designed in order to have current information of 25
A per phase at
full nominal load; the over current intervention threshold is set at 140% of the nominal (IINFOx =35A). Accord-
ing to the above relationship, the over current threshold (IOCPx) for each phase, which has to be placed at one
half of the total delivered maximum current, results:
An over current is detected when the current flowing into the sense element is greater than IOCP (IINFOx>35A):
the device enters in Quasi-Constant-Current operation. The low-side mosfets stays ON until IINFO becomes
lower than 35
A skipping clock cycles. The high side mosfets can be turned ON with a TON imposed by the
control loop at the next available clock cycle and the device works in the usual way until another OCP event is
detected.
The device limits the bottom of the inductor current triangular waveform. So the average current delivered can
slightly increase also in Over Current condition since the current ripple increases. In fact, the ON time increases
due to the OFF time rise because of the current has to reach the IOCP bottom. The worst-case condition is when
the duty cycle reaches its maximum value (d=50% internally limited). When this happens, the device works in
Constant Current and the output voltage decrease as the load increase. Crossing the UVP threshold causes the
Slave device to pull down the SLAVE_OK line. All mosfets are turned off and all the devices involved in the reg-
ulation stop working. Cycle the power supply to restart operation.
Figure 6 shows the constant current working condition
I
INFOx
R
SENSE
I
PHASE
R
g
---------------------------------------------
=
R
SENSE
Rg
50
A
IISENx
I PHASE
Rg
LGATEX
ISENX
PGNDSX
ILS1
ILS2
Track & Hold
Total
current
information
R
g
I
OCPx
R
SENSE
35
A
------------------------------------------
=
I
OCPx
35
AR
g
R
SENSE
--------------------------
=
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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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