E-L6202 Datasheet, PDF (14/20 Pages) STMicroelectronics – DMOS FULL BRIDGE DRIVER

L6201 - L6202 - L6203
It could be requested to drive a motor at VS lower
than the minimum recommended one of 12V
(See Electrical Characteristics); in this case, by
accepting a possible small increas in the RDS (ON)
resistance of the power output transistors at the
lowest Supply Voltage value, may be a good solu-
tion the one shown in Fig. 20.
Figure 20: L6201/1P/2/3 Used at a Supply Volt-
age Range Between 9 and 18V
Figure 21: Typical RTh J-amb vs. "On Board"
Heatsink Area (L6201)
L6201
L6201PS
L6202
L6203
Figure 22: Typical Transient RTH in Single Pulse
Condition (L6201)
THERMAL CHARACTERISTICS
Thanks to the high efficiency of this device, often
a true heatsink is not needed or it is simply ob-
tained by means of a copper side on the P.C.B.
(L6201/2).
Under heavy conditions, the L6203 needs a suit-
able cooling.
By using two square copper sides in a similar way
as it shown in Fig. 23, Fig. 21 indicates how to
choose the on board heatsink area when the
L6201 total power dissipation is known since:
RTh j-amb = (Tj max. – Tamb max) / Ptot
Figure 22 shows the Transient Thermal Resis-
tance vs. a single pulse time width.
Figure 23 and 24 refer to the L6202.
For the Multiwatt L6203 addition information is
given by Figure 25 (Thermal Resistance Junction-
Ambient vs. Total Power Dissipation) and Figure
26 (Peak Transient Thermal Resistance vs. Re-
petitive Pulse Width) while Figure 27 refers to the
single pulse Transient Thermal Resistance.
Figurre 23: Typical RTh J-amb vs. Two "On Board"
Square Heatsink (L6202)
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