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参数资料
| 型号： | L6919E |
| 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： | 5/33页 |
| 文件大小： | 644K |
| 代理商： | L6919E |
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13/33
L6919E
Figure 6. Constant Current operation
In this particular situation, the switching frequency results reduced. The ON time is the maximum allowed
(TonMAX) while the OFF time depends on the application:
Over current is set anyway when IINFOx reaches 35A (IFB = 70A). The full load value is only a convention
to work with convenient values for IFB. Since the OCP intervention threshold is fixed, to modify the percent-
age with respect to the load value, it can be simply considered that, for example, to have on OCP threshold
of 170%, this will correspond to IINFOx = 35A (IFB = 70A). The full load current will then correspond to
IINFOx = 20.6A (IFB = 41.1A).
Integrated Droop Function
The device uses a droop function to satisfy the requirements of high performance microprocessors, reducing
the size and the cost of the output capacitor.
This method "recovers" part of the drop due to the output capacitor ESR in the load transient, introducing a de-
pendence of the output voltage on the load current
As shown in figure 7, the ESR drop is present in any case, but using the droop function the total deviation of the
output voltage is minimized. In practice the droop function introduces a static error (VDROOP in figure 8) propor-
tional to the output current. Since the device has an average current mode regulation, the information about the
total current delivered is used to implement the Droop Function.
This current (equal to the sum of both IINFOx) is sourced from the FB pin. Connecting a resistor between this pin
and VOUT, the total current information flows only in this resistor because the compensation network between
FB and COMP has always a capacitor in series (See fig. 8). The voltage regulated is then equal to:
VOUT = VID - RFB IFB
Since IFB depends on the current information about the two phases, the output characteristic vs. load current is
given by:
a) Maximum current for each phase
b) Output Characteristic
TonMAX
IOCPx
Ipeak
IMAX
Vout
Iout
(IFB=50
A)
IOCP=2IOCPx
(IFB=70
A)
IMAX,TOT
UVP
Droop effect
T
OFF
L
Ipe ak
I
OC P x
–
V
OUT
--------------------------------------
=
f
1
T
ON m a x
T
OFF
+
------------------------------------------
=
V
OUT
VID
R
FB
R
SENSE
Rg
---------------------- I
OUT
–
=
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| 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 |
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