E-L9935 STMicroelectronics, E-L9935 Datasheet - Page 14

• Manufacturer Part Number: E-L9935
• Description: IC STEPPER MOTOR DVR 2PH 20PWRSO
• Manufacturer: STMicroelectronics
• Type: 2 Phase Stepper Motor Driverr

Specifications of E-L9935

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: ±1.2A
• Voltage - Supply: 8 V ~ 24 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-20 Exposed Bottom Pad
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 14.4 V
• Supply Current: 4.5 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Functional description
5.2.4
5.2.5
14/29
Reversing phase
Suppose the current flowed via M
phase M
D
Chopper control by oscillator
Both chopping circuits work with offset phase. One chopper will switch on the bridge at the
maximum voltage of the oscillator while the other chopper will switch on the bridge at
minimum voltage of the oscillator.
MS1 and MS2 blank switching spikes that could lead to errors of the current control circuit.
Figure 6.
11
. This leads to a fast current decay.
21
and M
Principal chopper control circuit
12
will be turned off. So now the current will flow through D
Doc ID 5198 Rev 9
21
, the load and M
12
before reversing phase. Reversing
22
, the load and
L9935