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参数资料
| 型号： | L9935 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO20 |
| 封装： | LEAD FREE, POWER, MO-166, SOP-20 |
| 文件页数： | 5/29页 |
| 文件大小： | 275K |
| 代理商： | L9935 |
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L9935
Functional description
5.2
Full bridge function
Figure 5.
Displays a full bridge including the current sense circuit.
5.2.1
No current
Bit 5, bit 4 (corresponding bit 2 and bit1 for bridge B) both are HIGH, the current logic will
inhibit all drivers D11, D12, D21, D22 turning off M11, M12, M21, M22 independently from the
signal of the current sense comparator comp 1.
5.2.2
Turning on
Changing bit 5 or bit 4 or both to LOW will turn on either M11 and M22 or M21 and M12
(depending on the phase signal bit 3). Current will start to flow through the load. The current
will be sensed by the drop across R1.
The threshold of the comparator comp 1 depends on the current settings of bit 5 and bit 4.
The current will rise until it exceeds the turn off threshold of comp 1.
5.2.3
Chopping
Exceeding the threshold of comp 1 the drive logic will turn off the sink transistor (M12 or
M22). The sink transistor periodically is turned on again by the oscillator. Immediately after
turning on M12 or M22 the comparator comp 1 will be inhibited for a certain time to blank
switch over spikes caused by capacitive load components up to 5 nF.
Turning off for example M12 will yield a flyback current through D11. (So now the free
wheeling current flows through M21, the load and D11).
This leads to a slow current decay during flyback. Maximum duty cycles of more than 85%
(at fOSC = 25 kHz) are possible. In this case current flows of both bridges will overlap (not
shown in Figure 7).
DRIVE
LOGIC
CURRENT
LOGIC
bit3, (bit0)
bit5, (bit2)
bit4, (bit1)
CURRENT ADJUST
INHIBIT
ON HH
LOAD
+
-
τ
D11
M11
D12
M12
D11
A1
A2
VS
R1
R1 EXTERNAL
SENSE RESISTOR
D12
COMP1
D22
D21
D22
M22
D21
M21
D99AT419
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相关代理商/技术参数 |
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| L9935013TR | 功能描述:马达/运动/点火控制器和驱动器 2-Ph Stepper Motor RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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| L9937 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:FULL BRIDGE MOTOR DRIVER |
| L993CG-1 | 制造商:Thomas & Betts 功能描述:1 INCH LR CONDUIT BODY W/CVR & GASK |
| L9942 | 制造商:STMicroelectronics 功能描述: |
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