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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： | 47/56页 |
| 文件大小： | 1081K |
| 代理商： | L6717 |
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L6717
LTB Technology
Doc ID 17326 Rev 1
51/56
12
LTB Technology
LTB Technology further enhances the performances of dual-edge asynchronous systems
by reducing the system latencies and immediately turning ON all the phases to provide the
correct amount of energy to the load. By properly designing the LTB network as well as the
LTB gain, the undershoot and the ring-back can be minimized also optimizing the output
capacitors count. LTB Technology applies only to the CORE section.
LTB Technology monitors the output voltage through a dedicated pin detecting Load-
Transients with selected dV/dt, it cancels the interleaved phase-shift, turning-on
simultaneously all phases. it then implements a parallel, independent loop that reacts to
load-transients bypassing E/A latencies.
Figure 19.
LTB Technology control loop (CORE section)
The LTB detector is able to detect output load transients by coupling the output voltage
through an RLTB - CLTB network. After detecting a load transient, the LTB Ramp is reset and
then compared with the COMP pin level. The resulting duty-cycle programmed is then OR-
ed with the PWMx signal of each phase by-passing the main control loop. All the phases will
then be turned-on together and the EA latencies results bypassed as well.
Sensitivity of the load transient detector can be programmed in order to control precisely
both the undershoot and the ring-back.
RLTB - CLTB is designed according to the output voltage deviation dVOUT which is desired the
controller to be sensitive as follow:
LTB Technology design tips.
–
Decrease RLTB to increase the system sensitivity making the system sensitive to
smaller dVOUT.
–
Increase CLTB to increase the system sensitivity making the system sensitive to
higher dV/dt.
Ref
FB
COMP
VSEN
FBG
R
F
C
F
R
FB
PWM
L/N
ESR
CO
R
O
d VCOMP
VOUT
ZF(s)
ZFB(s)
VID
V
COMP
C
H
C
FB
LT
B
Monitor
RLTB
CLTB
PWM_BOOST
LTB Ramp
LTB
LT Detect
R
LTB
dV
OUT
25
μA
------------------
=
C
LTB
1
2
π NR
LTB
F
SW
--------------------------------------------------
=
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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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