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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： | 10/33页 |
| 文件大小： | 644K |
| 代理商： | L6919ETR |
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Obsolete
Product(s)
- Obsolete
Product(s)
L6919E
18/33
Figure 12. Inductor ripple current vs VOUT
MAIN CONTROL LOOP
The control loop is composed by the Current Sharing control loop and the Average Current Mode control loop.
Each loop gives, with a proper gain, the correction to the PWM in order to minimize the error in its regulation:
the Current Sharing control loop equalize the currents in the inductors while the Average Current Mode control
loop fixes the output voltage equal to the reference programmed by VID. Figure 13 reports the block diagram of
the main control loop.
Figure 13. Main Control Loop Diagram
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 in-
ternally 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. 14).
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
0
1
2
3
4
5
6
7
8
9
0.5
1.5
2.5
3.5
Output Voltage [V]
In
du
ct
or
R
ip
p
le
[A
]
L=3
H,
Vin=12V
L=2
H,
Vin=12V
L=1.5
H, Vin=12V
L=2
H,
Vin=5V
L=1.5
H,
Vin=5V
L=3
H, Vin=5V
L1
L2
+
PWM1
1/5
+
-
1/5
IINFO2
IINFO1
4/5
ZF(S)
PWM2
CO
FB
COMP
RO
ERROR
AMPLIFIER
REFERENCE
PROGRAMMED
BY VID
CURRENT
SHARING
DUTY CYCLE
CORRECTION
RFB
D02IN1392
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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