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参数资料
| 型号： | L6713ATR |
| 厂商： | Holtek Semiconductor Inc. |
| 英文描述： | 2/3 Phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs |
| 中文描述： | 2 / 3为英特尔VR10，VR11和AMD的嵌入式驱动器相控制器6位CPU |
| 文件页数： | 55/64页 |
| 文件大小： | 515K |
| 代理商： | L6713ATR |
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L6713A
Layout guidelines
59/64
24.2
Small signal components and connections
These are small signal components and connections to critical nodes of the application as
well as bypass capacitors for the device supply (See Figure 28). Locate the bypass
capacitor (VCC, VCCDRx and Bootstrap capacitor) close to the device and refer sensible
components such as frequency set-up resistor ROSC, over current resistor ROCP and OVP
resistor ROVP to SGND. Star grounding is suggested: connect SGND to PGND plane in a
single point to avoid that drops due to the high current delivered causes errors in the device
behavior.
Warning:
Boot Capacitor Extra Charge. Systems that do not use
Schottky diodes might show big negative spikes on the
phase pin. This spike can be limited as well as the positive
spike but has an additional consequence: it causes the
bootstrap capacitor to be over-charged. This extra-charge
can cause, in the worst case condition of maximum input
voltage and during particular transients, that boot-to-phase
voltage overcomes the abs. max. ratings also causing device
failures. It is then suggested in this cases to limit this extra-
charge by adding a small resistor in series to the boot diode
(one resistor can be enough for all the three diodes if placed
upstream the diode anode, See Figure 28) and by using
standard and low-capacitive diodes.
Figure 28. Power connections and related connections layout (same for all phases).
Remote Sensing Connection must be routed as parallel nets from the FB/VSEN pins to the
load in order to avoid the pick-up of any common mode noise. Connecting these pins in
points far from the load will cause a non-optimum load regulation, increasing output
tolerance.
Locate current reading components close to the device. The PCB traces connecting the
reading point must use dedicated nets, routed as parallel traces in order to avoid the pick-up
of any common mode noise. It's also important to avoid any offset in the measurement and,
to get a better precision, to connect the traces as close as possible to the sensing elements.
Symmetrical layout is also suggested. Small filtering capacitor can be added, near the
controller, between VOUT and SGND, on the CSx- line to allow higher layout flexibility.
L
CIN
VIN
UGATEx
PHASEx
LGATEx
PGNDx
LOAD
BOOTx
PHASEx
VCC
SGND
+Vcc
C
BOOT
L
CIN
VIN
LOAD
To limit C
BOOT
Extra-Charge
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