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参数资料
| 型号： | L6919ETR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO28 |
| 封装： | SO-28 |
| 文件页数： | 11/33页 |
| 文件大小： | 644K |
| 代理商： | L6919ETR |
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Obsolete
Product(s)
- Obsolete
Product(s)
19/33
L6919E
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 14. Current Sharing Control Loop
Average Current Mode (ACM) Control Loop
The average current mode control loop is reported in figure 15. 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;
–ZF(s) is the compensation network impedance;
–ZL(s) is the parallel of the two inductor impedance;
– A(s) is the error amplifier gain;
–
is the ACM PWM transfer function where
VOSC is the oscillator ramp amplitude
and has a typical value of 3V
Removing the dependence from the Error Amplifier gain, so assuming this gain high enough, the control loop
gain results:
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
=
PWM
4
5
---
V
IN
V
OSC
-------------------
=
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相关代理商/技术参数 |
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|---|---|
| L-692 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:Common Mode Inductor |
| L6920 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER |
| L6920D | 功能描述:直流/直流开关转换器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| L6920DB | 功能描述:直流/直流开关转换器 Synchronous Rectifer Step Up Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| L6920DBTR | 功能描述:直流/直流开关转换器 SYNCRONOUS RECT. STEP UP CONVERTER RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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