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参数资料
| 型号： | L6917BD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 9/33页 |
| 文件大小： | 631K |
| 代理商： | L6917BD |
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Obsolete
Product(s)
- Obsolete
Product(s)
17/33
L6917B
s
Current Sharing (CS) Control Loop
Active current sharing is implemented using the information from Tran conductance differential amplifier in an
average current mode control scheme. A current reference equal to the average of the read current (IAVG) is
internally built; the error between the read current and this reference is converted to a voltage with a proper gain
and it is used to adjust the duty cycle whose dominant value is set by the error amplifier at COMP pin (See fig.
11).
The current sharing control is a high bandwidth control loop allowing current sharing even during load transients.
The current sharing error is affected by the choice of external components; choose precise Rg resistor (±1% is
necessary) to sense the current. The current sharing error is internally dominated by the voltage offset of Tran
conductance differential amplifier; considering a voltage offset equal to 2mV across the sense resistor, the cur-
rent reading error is given by the following equation:
Where
IREAD is the difference between one phase current and the ideal current (IMAX/2).
For Rsense = 4m
and Imax = 40A the current sharing error is equal to 2.5%, neglecting errors due to Rg and
Rsense mismatches.
Figure 11. Current Sharing Control Loop
s
Average Current Mode (ACM) Control Loop
The average current mode control loop is reported in figure 12. The current information IFB sourced by the FB
pin flows into RFB implementing the dependence of the output voltage from the read current.
The ACM control loop gain results (obtained opening the loop after the COMP pin):
Where:
–
is the equivalent output resistance determined by the droop function;
–ZP(s) is the impedance resulting by the parallel of the output capacitor (and its ESR) and the applied
load Ro;
I
RE AD
I
MAX
--------------------
2m V
R
SENSE
I
MAX
----------------------------------------
=
L1
L2
+
PWM1
1/5
IINFO2
IINFO1
PWM2
COMP
VOUT
CURRENT
SHARING
DUTY CYCLE
CORRECTION
D02IN1393
G
LOOP s
()
PWM Z
F s
() R
DROOP
Z
P s
()
+
()
Z
P s
() Z
L s
()
+
()
Z
F s
()
As
()
---------------
1
As
()
------------
+
R
FB
+
--------------------------------------------------------------------------------------------------------------------
=
R
DROOP
R
sense
R
g
-------------------
R
FB
=
相关PDF资料 |
PDF描述 |
|---|---|
| L6917BDTR | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6917D | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6918ADTR | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6918AD | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO28 |
| L6919CD | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6917BDTR | 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 |
| L6917D | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| L6917DTR | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| L6918 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
| L6918A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5 BIT PROGRAMMABLE MULTIPHASE CONTROLLER |
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