SM645 datasheet(3/4 Pages) MICROSEMI

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SM645/SM646/SM647

4/90 Rev 1.1 2/94

LINFINITY Microelectronics Inc.

11861 Western Avenue

∞

∞ Garden Grove, CA 92841

(714) 898-8121

∞

∞ FAX: (714) 893-2570

Current Delay Time

Current Rise Time

Voltage Rise Time

Voltage Storage Time

Voltage Fall Time

Current Fall Time

Efficiency (Note 5)

Test Conditions

Parameter

Units

ELECTRICAL CHARACTERISTICS (continued)

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) ≅ tdi + tri and Current Storage Time (tsi) ≅ tsv + tfv .

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.

Dynamic Characteristics (See Figures 1 & 2) (Notes 4 & 5)

AC TEST CIRCUIT AND SWITCHING TIME WAVEFORMS (Note 6)

FIGURE 1 - SM645/646/647 SWITCHING SPEED CIRCUIT

FIGURE 2 - SM645/646/647 SWITCHING WAVEFORMS

SM645

SM646

SM647

150

175

300

700

175

SG645/646/647

Min.

Typ. Max.

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

FIGURE 3 - STEP DOWN (BUCK) CONVERTER

APPLICATION CIRCUITS

SM64X

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