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| 型号： | L6716 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48 |
| 封装： | 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48 |
| 文件页数： | 40/57页 |
| 文件大小： | 829K |
| 代理商： | L6716 |
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L6716
Oscillator
Doc ID 14521 Rev 3
45/57
20
Oscillator
L6716 embeds two-to-four phase oscillator with optimized phase-shift (180/120/90
phase-shift) in order to reduce the input rms current and optimize the output filter definition.
The internal oscillator generates the triangular waveform for the PWM charging and
discharging with a constant current an internal capacitor. The switching frequency for each
channel, FSW, is internally fixed at 200 kHz so that the resulting switching frequency at the
load side results in being multiplied by N (number of phases).
The current delivered to the oscillator is typically 25
μA (corresponding to the free running
frequency FSW = 200 kHz) and it may be varied using an external resistor (ROSC) connected
between the OSC/FAULT pin and SGND or VCC (or a fixed voltage greater than 1.24 V).
Since the OSC/FAULT pin is fixed at 1.240 V, the frequency is varied proportionally to the
current sunk (forced) from (into) the pin considering the internal gain of 9.1 kHz/
μA.
In particular connecting ROSC to SGND the frequency is increased (current is sunk from the
pin), while connecting ROSC to VCC = 12 V the frequency is reduced (current is forced into
the pin), according the following relationships:
ROSC vs. SGND
ROSC vs. +12 V
Maximum programmable switching frequency per phase must be limited to 1 MHz to avoid
minimum Ton limitation. Anyway, device power dissipation must be checked prior to design
high switching frequency systems.
Figure 27.
ROSC vs. switching frequency
F
SW
200 kHz
()
1.240V
R
OSC kΩ
()
---------------------------- 9.1
kHz
μA
-----------
+
200 kHz
() 11.284 10
3
R
OSC kΩ
()
--------------------------------
R
OSC kΩ
()
+
11.284 10
3
F
SW kHz
() 200 kHz
()
–
------------------------------------------------------------
==
=
k
Ω
[]
F
SW
200 kHz
() 12V 1.240V
–
R
OSC kΩ
()
------------------------------------ 9.1
kHz
μA
-----------
–
200 kHz
() 9.7916 10
4
R
OSC kΩ
()
--------------------------------
–
R
OSC kΩ
()
9.7916 10
4
200 kHz
() F
SW kHz
()
–
------------------------------------------------------------
==
=
k
Ω
[]
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相关代理商/技术参数 |
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|---|---|
| L6716TR | 功能描述:开关变换器、稳压器与控制器 2/3/4 phase CNTRL Embedded Drivers 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 |
| L6717 | 制造商:STMicroelectronics 功能描述:High-Efficiency Hybrid AM2r2 Controller 48-Pin VFQFPN 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 |
| 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 |
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