L9958SB STMicroelectronics, L9958SB Datasheet - Page 18

• 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

Current regulation
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selection can be done "on the fly" by SPI. The corresponding bits are called "VSR" and
"ISR". No external component is needed to select the slew rate range. Only the power
transistors not used for freewheeling can be adjusted, the two others can be controlled with
a preset slew rate.
The couples of value defined to fulfill most of the application requirements are described in
the table below. The required accuracy is ±50 % for an output current from 1A to 8A and with
output voltage up to 19 V. The overall delay implemented between high-side and low-side
transistor switching must be adjusted automatically to avoid any cross-conduction through
one half-bridge in all conditions.
Table 10.
In case of current limitation and any detection that put the bridge in tri-state, the slew rate is
not related anymore to the preset bits "VSR"; "ISR" but to a dedicated faster slew rate
control named "SUPER FAST" mode. The automatic change from SPI selectable to SUPER
FAST slew rate is described hereafter.
Figure 14. Slew rate switching strategy
1 (default value)
No SR control
Range
2
3
4
Slew rate control on low side MOS
VSR
Not selectable
0
0
1
1
Doc ID 17269 Rev 2
ISR
0
1
0
1
dV/dt (V/µs)
14
4
4
2
2
dI/dt (A/µs)
0.3
0.3
14
3
3
L9958