SM625/SM626/SM627
ELECTRICAL SPECIFICATIONS
Parameter
(continued)
Test Conditions
SG625/626/627
Min. Typ. Max.
35
65
40
700
70
175
85
60
150
60
175
300
Units
ns
ns
ns
ns
ns
ns
%
Dynamic Characteristics
(See Figures 1 & 2)
(Notes 4 & 5)
Current Delay Time
Current Rise Time
Voltage Rise Time
Voltage Storage Time
Voltage Fall Time
Current Fall Time
Efficiency
(Note 5)
AC TEST CIRCUIT AND SWITCHING TIME WAVEFORMS
(Note 6)
SM625
SM626
SM627
FIGURE 1 - SM625/626/627 SWITCHING SPEED CIRCUIT
FIGURE 2 - SM625/626/627 SWITCHING WAVEFORMS
Note 4. In switching an inductive load, the current will lead the voltage on turn-on and lag the voltage on turn-off (see Figure 2). Therefore, Voltage
Delay Time (t
DV
)
≅
t
di
+ t
ri
and Current Storage Time (t
si
)
≅
t
sv
+ t
fv
.
Note 5. The efficiency is a measure of internal power losses and is equal to Output Power divided by Input Power. The switching speed circuit of Figure
1, in which the efficiency measured, is represenative of typical operating conditions for the SM600 series switching regulators.
APPLICATION CIRCUITS
SM62X
SM62X
FIGURE 3 - STEP DOWN (BUCK) CONVERTER
FIGURE 4 - NEGATIVE OUTPUT DOWN/UP (BUCK-BOOST) CONVERTER
4/90 Rev 1.1 2/94
Copyright
©
1994
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MICRO-ELECTRONICS [ Micro Electronics ]
