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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： | 41/56页 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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Main oscillator
L6717
46/56
Doc ID 17326 Rev 1
9
Main oscillator
The controller embeds a dual-oscillator: one section is used for the CORE and it is a multi-
phase programmable oscillator managing equal phase-shift among all phases and the other
section is used for the NB section. Phase-shift between the CORE and NB ramps is
automatically adjusted according to the CORE phase # programmed.
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: the resulting switching frequency for the CORE
section at the load side results in being multiplied by N (number of configured phases).
The current delivered to the oscillator is typically 20
μA (corresponding to the free running
frequency FSW=200 kHz) and it may be varied using an external resistor (ROSC) typically
connected between the OSC pin and SGND. Since the OSC pin is fixed at 1.240 V, the
frequency is varied proportionally to the current sunk from the pin considering the internal
gain of 9.1 kHz/
μA (See Figure 15).
Connecting ROSC to SGND the frequency is increased (current is sunk by the pin),
according to the following relationships:
Connecting ROSC to a positive voltage (recommended 3.3 V rail) the frequency is reduced
(current is injected into the pin), according to the following relationships:
where +V is the positive voltage which the ROSC resistor is connected.
Figure 15.
ROSC vs. switching frequency
F
SW
200kHz
1.240V
R
OSC
------------------- 9.1
kHz
μA
-----------
+
=
F
SW
200kHz
+V
1.240
–
R
OSC
---------------------------- 9.1
kHz
μA
-----------
–
=
FSW vs. Rosc
75
125
175
225
275
325
375
425
0
50
100
150
200
250
300
350
400
450
Rosc [kOhm]
Fs
w
[
k
H
z]
Rosc+ (to SGND)
Rosc- (to 3V3)
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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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