參數(shù)資料
型號： L6460TR
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動控制電子
英文描述： STEPPER MOTOR CONTROLLER, PQFP64
封裝： 10 X 10 MM, 1 MM HEIGHT, ROHS COMPLIANT, TQFP-64
文件頁數(shù)： 89/139頁
文件大?。?/td> 3837K
代理商： L6460TR
L6460
Switching regulator controller
Doc ID 17713 Rev 1
53/139
Figure 12.
Switching regulator controller functional blocks
13.1
Pulse skipping operation
Pulse skipping strategy has already been explained on main switching regulator section.
This regulator has 4 possible PWM duty cycles that can be changed writing in the
SelSwCtrPWM bits in the SwCtrCfg register using SPI.
Vout
La
Vsupply
C
Driver
Control
Logic
CurrentSense
Charge pump Voltage
Voltage
Loop Control
VFBRef
-
+
Under voltage
Threshold
Filter
Ra
Rb
From Central Logic
Regulator Freq
-
+
To Central Logic
undervoltage flag
Rsense
VSWDRV_gate
N-CH Fet
An
al
og
Mu
x
Vref = 3 V
Vref=0.8V
SelFBRef[1:0]
An
al
og
Mu
x
Uv Threshold 1
SelFBRef
Uv Threshold 2
Vref = 3V
Vref=0.8V
VSWDRV FB
VSWDRV SW
VSWDRW_sns
Table 12.
Switching regulator controller PWM specification
SwCtrCfg register
Duty cycle value
Comments
SelSwCtrPWM[1:0]
Typical
00
9%
01
12%
10
22.5%
Default state
11
58%
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