E-L9935 STMicroelectronics, E-L9935 Datasheet - Page 16

• 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
5.5
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next data transfer took place. After detection of a short to V
corresponding bridge to reduce power dissipation for at least 1ms.
Diagnosis of a short to V
During the short current through the sink transistor will rise more rapidly than under normal
load conditions. Reaching a peak current of 1.5 times the maximum PWM current between
typically 2 µs and 5 µs
after turn on will be detected as a short to V
Detecting a short the low side transistor will try to turn on again the next 7 trigger pulse of
the oscillator.
Simultaneously the error flag will updated on each pulse.
Figure 8.
Between t
Between t
(1.5 times the current of current setting LL).
Overcurrent now will set the error flag.
After t
Exceeding this current will just turn off the sink transistor. This is considered as normal
operation. The error flag is detached from the comparator after t
during normal pulse width modulation.
PWM
on
short
the current threshold is the nominal PWM current set by the external resistor.
and t
Normal PWM current versus short circuit current and detection of short
to V
and t
S
short
PWM
the over current detection is totally blanked.
the current threshold is set to 1.5 times the maximum PWM current
Doc ID 5198 Rev 9
S
S
.
S
we suggest to turn off the
PWM
so no error flag is set
L9935