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)： 112/139頁
文件大?。?/td> 3837K
代理商： L6460TR
Power bridges
L6460
74/139
Doc ID 17713 Rev 1
Here after are summarized the primary features of the regulator(s):
–
Synchronous rectification
–
Automatic low side disabling when current in the inductance reaches 0 to optimize
efficiency at low load
–
Pulse skipping control
–
Internally generated PWM
–
Cycle by cycle current limiting using internal current sensor
–
Protected against load short circuit
–
Soft start circuitry
–
Under voltage signal (both continuous and latched) accessible through serial
interface.
Figure 19.
Regulator block diagram
Depending on the load current, there could be the necessity to add a Schottky diode on
output to reduce internal thermal dissipation. This diode must be placed near to the pin and
must be fast recovery and low series resistance type.
For detail about pulse skipping please refer to main switching regulator Section 13.3 on
The output voltage will be externally set by a divider network connected on feedback pin. To
reduce as much as possible the regulation voltage error L6460 has the possibility to switch
between four regulator feedback voltage references (and, as a consequence, four under-
Vout
La
Vsupply
Half Bridge OUT
C
High Side
Driver
Control
Logic
CurrentSense
Charge pump Voltage
GPIO USED as FB
Voltage
Loop Control
Regulator Ref
-
+
Under voltage
Threshold
Filter
Ra
Rb
Low Side
Driver
From Central Logic
Regulator Freq
-
+
To Central Logic
Obtained using spare analo
g
/di
gital blocks
BridgeSense
Vref= 0.8V
N.C.
Vref=3V
SelFBRef
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