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参数资料
| 型号： | L6740L |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PQFP48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, HTQFP-48 |
| 文件页数： | 17/44页 |
| 文件大小： | 755K |
| 代理商： | L6740L |
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Output voltage positioning
L6740L
6.1
CORE section - phase # programming
CORE section implements a flexible 2 to 4 interleaved-phase converter. To program the
desired number of phase, simply short to SGND the PWMx signal that is not required to be
used according to Table 11. For three phase operation, short PWM4 to SGND while for two
phase operation, short PWM3 and PWM4 to SGND.
Caution:
For the disabled phase(s), the current reading pins need to be properly connected to avoid
errors in current-sharing and voltage-positioning: CSx+ needs to be connected to the
regulated output voltage while CSx- needs to be connected to CSx+ through the same Rg
resistor used for the active phases.
Table 11.
CORE section - phase number programming
6.2
CORE section - current reading and current sharing loop
L6740L embeds a flexible, fully-differential current sense circuitry for the CORE section that
is able to read across inductor parasitic resistance or across a sense resistor placed in
series to the inductor element. The fully-differential current reading rejects noise and allows
placing sensing element in different locations without affecting the measurement's accuracy.
The trans-conductance ratio is issued by the external resistor Rg placed outside the chip
between CSx- pin toward the reading points. The current sense circuit always tracks the cur-
rent information, the pin CSx+ is used as a reference keeping the CSx- pin to this voltage. To
correctly reproduce the inductor current an R-C filtering network must be introduced in par-
allel to the sensing element. The current that flows from the CSx- pin is then given by the fol-
lowing equation (See Figure 10):
Considering now to match the time constant between the inductor and the R-C filter applied
(Time constant mismatches cause the introduction of poles into the current reading network
causing instability. In addition, it is also important for the load transient response and to let
the system show resistive equivalent output impedance) it results:
RG resistor is typically designed in order to have an information current IINFOx in the range of
about 35
μA (I
OCTH) at the OC threshold.
Phase number
PWM1
PWM2
PWM3
PWM4
1n/a
2
to Driver
SGND
3
to Driver
SGND
4
to Driver
I
CSx-
DCR
R
G
-------------
1
s L DCR
+
1s R C
+
-------------------------------------- I
PHASEx
=
L
R
L
-------
RC
I
CSx-
R
L
R
G
-------- I
PHASEx
=
I
INFOx
==
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6740LTR | 功能描述:DC/DC 开关控制器 Hybrid controller 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 |
| L6741 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6741TR | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743 | 功能描述:功率驱动器IC SnglPphase Dual MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| L6743_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High current MOSFET driver |
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