SM645/SM646/SM647

4/90 Rev 1.1 2/94

Copyright

© 1994

11861 Western Avenue

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∞

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∞ Garden Grove, CA 92841

3

(714) 898-8121

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∞ FAX: (714) 893-2570

Current Delay Time

Current Rise Time

Voltage Rise Time

Voltage Storage Time

Voltage Fall Time

Current Fall Time

ns

ns

ns

ns

ns

ns

%

Test Conditions

Parameter

Units

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

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.

FIGURE 1 - SM645/646/647 SWITCHING SPEED CIRCUIT

FIGURE 2 - SM645/646/647 SWITCHING WAVEFORMS

SM645

SM646

SM647

60

150

60

175

300

35

65

40

700

70

175

85

SG645/646/647

Min.

Typ. Max.

FIGURE 4 - NEGATIVE OUTPUT DOWN/UP (BUCK-BOOST) CONVERTER

FIGURE 3 - STEP DOWN (BUCK) CONVERTER

APPLICATION CIRCUITS

SM64X

SM64X