參數(shù)資料
型號(hào)： L6228PDTR
廠商： STMICROELECTRONICS
元件分類： 運(yùn)動(dòng)控制電子
英文描述： STEPPER MOTOR CONTROLLER, 2.8 A, PDSO36
封裝： POWER, SO-36
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 589K
代理商： L6228PDTR
L6228
16/26
Figure 18. Wave Drive Mode
NON-DISSIPATIVE OVERCURRENT PROTECTION
The L6228 integrates an Overcurrent Detection Circuit (OCD) for full protection. This circuit provides protection
against a short circuit to ground or between two phases of the bridge. With this internal over current detection,
the external current sense resistor normally used and its associated power dissipation are eliminated. Figure 19
shows a simplified schematic of the overcurrent detection circuit.
To implement the over current detection, a sensing element that delivers a small but precise fraction of the out-
put current is implemented with each high side power MOS. Since this current is a small fraction of the output
current there is very little additional power dissipation. This current is compared with an internal reference cur-
rent IREF. When the output current reaches the detection threshold (typically 2.8A) the OCD comparator signals
a fault condition. When a fault condition is detected, the EN pin is pulled below the turn off threshold (1.3V typ-
ical) by an internal open drain MOS with a pull down capability of 4mA. By using an external R-C on the EN pin,
the off time before recovering normal operation can be easily programmed by means of the accurate thresholds
of the logic inputs.
Figure 19. Overcurrent Protection Simplified Schematic
2
4
2
D01IN1321
4682468
6
8
IOUTA
IOUTB
CLOCK
35
17
Start Up or Reset
+
OVER TEMPERATURE
IREF
(I1A+I2A) / n
I1A / n
POWER SENSE
1 cell
POWER SENSE
1 cell
POWER DMOS
n cells
POWER DMOS
n cells
HIGH SIDE DMOSs OF
THE BRIDGE A
OUT1A
OUT2A
VSA
I1A
I2A
I2A / n
FROM THE
BRIDGE B
OCD
COMPARATOR
OCD
COMPARATOR
TO GATE
LOGIC
INTERNAL
OPEN-DRAIN
RDS(ON)
40
TYP.
CEN.
REN.EN
VDD
C or LOGIC
D01IN1337
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PDF描述
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參數(shù)描述
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