Diodes ZHB6718 - Manual (Page 7)

ZHB6718
SAFE OPERATING AREA
100m 100
1s
100ms
10
DC
10m
V CE - Collector Emitter Voltage (V)
Safe Operating Area (Full Copper)
10ms
1ms
100µs
1 10
100m
1
100m 100
1s
100ms
10
DC
10m
V CE - Collector Emitter Voltage (V)
Safe Operating Area (Minimum Copper)
10ms
1ms
100µs
1 10
100m
1
see note below see note below
Note: The Safe Operating Area (SOA) charts shown are a combination of the worst case secondary
breakdown characteristics for the NPN/PNP pair, and the thermal curves demonstrating the
power dissipation capability of the energised ZHB part (opposing NPN-PNP switched on) when
mounted on a 50mm x 50mm FR4 PCB. The two cases show:
i) full copper present and
ii) with minimal copper present - this being defined as an SM-8 footprint with 1.5mm tracks to
the edge of the PCB.
For example, on a 50mm x 50mm full copper PCB, the ZHB6718 will safely dissipate 2W under
DC conditions, taking note of continuous current ratings and voltage limits. Higher powers can
be tolerated for pulsed operation, while the shorter pulse widths (100 µ s and 1ms) being relevant
for assessment of switching conditions.
The ZHB6718 ’H’-Bridge can be modelled within SPICE using the following transistor models
configured in the standard ’H’-Bridge topology, as shown in the schematic diagram of this datasheet.
*ZETEX H Bridge NPN transistors Spice model Last revision 4/7/97
.MODEL H6718N NPN IS =5.611E-13 NF =1.0022 BF =480 IKF=4.6 VAF=51
+ ISE=1.73E-13 NE =1.4 NR =1.0002 BR =200 IKR=3 VAR=25
+ ISC=7.3152E-13 NC =1.47 RB =0.032 RE =0.027 RC =0.025
+ CJC=59E-12 MJC=0.2651 VJC=0.3051 CJE=216E-12
+ TF =0.95E-9 TR =2.25E-9
*
*
*ZETEX H Bridge PNP transistors Spice model Last revision 4/7/97
.MODEL H6718P PNP IS =6.8E-13 BF =480 IKF =2 VAF =23
+ ISE=0.8E-13 NE =1.5567 NR =1.00 BR =70 IKR=0.4
+ VAR=7 ISC=7.5E-14 NC =1.19 RB =0.085 RE =0.04
+ RC =0.045 CJC=70.02E-12 MJC=0.4685 VJC=0.7714
+ CJE=203.6E-12 MJE=0.5029 VJE=0.9403 TF =0.71E-9
+TR =23.7E-9
*
(C) 1997 ZETEX PLC
The copyright in these models and the design embodied belong to Zetex PLC (“Zetex”). They are supplied
free of charge by Zetex for the purpose of research and design and may be used or copied intact (including
this notice) for that purpose only. All other rights are reserved. The models are believed accurate but no
condition or warranty as to their merchantability or fitness for purpose is given and no liability in respect
of any use is accepted by Zetex PLC, its distributors or agents. Zetex PLC, Fields New Road, Chadderton,
Oldham OL9 8NP, UK.