ATA6826-DK Atmel, ATA6826-DK Datasheet - Page 14

• Manufacturer Part Number: ATA6826-DK
• Description: BOARD EVALUATION FOR ATA6826
• Manufacturer: Atmel

Specifications of ATA6826-DK

• Main Purpose: Power Management, Half H-Bridge Driver (Internal FET)
• Embedded: No
• Utilized Ic / Part: ATA6826
• Primary Attributes: 3 Half H-Bridge Drivers, 1A, 2 kV ESD Protection
• Secondary Attributes: Short-Circuit, Thermal & Undervoltage Protection
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

6. Overload Considerations
6.1
14
Driver Output Shorted to V
ATA6826
During normal operation, ATA6826 is protected against short circuits by an overcurrent limita-
tion. However, some attention has to be paid to certain abnormal operating conditions that might
occur in practice. In particular, we have to consider the case of an output shorted to V
the IC is not connected to supply voltage V
current flows from the shorted output via the voltage supply pin to the capacitor C1.
illustrates the situation.
The backward current I
itor C1 is charged to V
the capacitance of C1, but the quality of C1 (ESR) and any parasitic resistance will also have an
impact. The recommended range for C1 is 22 µF to 100 µF. As stated in the datasheet, the max-
imum reverse current is 17A for a duration of 150 µs. The graph illustrated in
the typical voltage and reverse current gradients for a capacitor value of 100 µF.
Figure 6-1.
Figure 6-2.
Current Flow in the Case of HSx Shorted to V
Current and Voltage Gradients
for V
S
out
V
C1
S
= 16V, C1 = 100 µF; Channel 1 = I
out
b
flows from OUTx via the HSx output stage to the V
(minus the drop across the diode). Its value is strongly influenced by
I
b
ATA6826
S
. Under these conditions, an unwanted backward
HSx
b
, Channel 2 = V
out
OUTx
Vs
V
, Channel 3 = V
S
out
pin until the capac-
Figure 6-2
4981A–AUTO–02/07
Figure 6-1
out
shows
while
out