L9958SB STMicroelectronics, L9958SB Datasheet - Page 17

• Manufacturer Part Number: L9958SB
• Description: IC H-BRIDGE SPI POWERSO16
• Manufacturer: STMicroelectronics

Specifications of L9958SB

• Applications: DC Motor Driver, Brushless (BLDC)
• Number Of Outputs: 2
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: PowerSO-16 Exposed Bottom Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L9958
4.2
4.3
Figure 12. Temperature dependent current regulation
Current regulation with low-inductive loads
Each time output stages are turned off, an internal timing starts for duration Toff-min.
Whenever turn-on is reached in a time Toff that is shorter than Toff-min, output stages are
kept OFF, until Toff-min is reached.
In such case the ripple control could be not so precise as specified.
Figure 13. Current regulation with different loads
Slew rate control in case of current limitation on low-side
The slew rate control can be done on voltage and current or only on voltage. This can be
selected by SPI through the bit ISR_DIS.
The slew rate of each high-side power transistor of the bridge is controlled either during
turn-on and turn-off (current AND voltage slew rate). The same setting is applied for both
switching. Moreover, this slew rate is configurable by SPI in order to get the best trade-off
between conducted/radiated EMI and power dissipation during switching. The slew rate
Doc ID 17269 Rev 2
Current regulation
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