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| 型号： | L6717 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFPN-48 |
| 文件页数： | 29/56页 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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L6717
Output voltage positioning
Doc ID 17326 Rev 1
35/56
7.1
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 GND the PWMx signal that is not required to be
used according to Table 19. For three phase operation, short PWM4 to GND while for two
phase operation, short PWM3 and PWM4 to GND.
Caution:
For the disabled phase(s), the current reading pins need to be properly connected to avoid
errors in current-sharing and voltage-positioning: CSxP needs to be connected to the
regulated output voltage while CSxN needs to be connected to CSxP through the same RG
phase connections.
Table 19.
CORE section - phase number programming
7.2
CORE section - current reading and current sharing loop
L6717 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 CSxN pin toward the reading points. The current sense circuit always tracks the
current information, the pin CSxP is used as a reference keeping the CSxN pin to this volt-
age. To correctly reproduce the inductor current an R-C filtering network must be introduced
in parallel to the sensing element. The current that flows from the CSxN pin is then given by
the following 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
PWM3
PWM4
2GND
GND
3
To driver
GND
4
To driver
I
CSxN
DCR
R
G
-------------
1
s L DCR
+
1s R C
+
-------------------------------------- I
PHASEx
=
L
DCR
-------------
RC
I
CSxN
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 |
|---|---|
| L6717A | 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller Tray 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Trays 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver |
| L6717ATR | 制造商:STMicroelectronics 功能描述:CPU Power Supply Controller T/R 制造商:STMicroelectronics 功能描述:HANDHELD & COMPUTER PM - Tape and Reel 制造商:STMicroelectronics 功能描述:High EFF Hybrid CTRL I2C Embedded Driver |
| L6717TR | 功能描述:开关变换器、稳压器与控制器 High-Efficienc AM2r2 Hybrid Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6718TR | 功能描述:其他电源管理 Multiphase Dual PWM VR12 25MHz LTB RoHS:否 制造商:Texas Instruments 输出电压范围: 输出电流:4 mA 输入电压范围:3 V to 3.6 V 输入电流: 功率耗散: 工作温度范围:- 40 C to + 110 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-48 封装:Reel |
| L6720 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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