Since the switch transistor in the RC4190 is in parallel with the load, a method must be used to convert it to a series con- nection for step-down applications. The circuit of Figure 11 accomplishes this. The 2N2907 replaces S of Figure 10, and R6 and R7 are added to provide the base drive to the 2N2907 in the correct polarity to operate the circuit properly
CD4027PWR on stock COLLECTOR TO EMITTER VOLTAGE (VCEO) . . . . . . . . .. EMITTER TO BASE VOLTAOE (VEBO). . . . . :' COLLECTOR TO BASE VOLTAGE (VCBO) .. . .... . .. ... CONTIFJUOUS COLLECTOR CURRENT (IC)(Note l) . . . . TOTAL POWER DISSIPATION (TA S 250C) (PT) (Noie 2) . . . . . . . . . . . . . OPERATING TEMPERATURE (Tj) . . . . . . .. STORAGE TEMPERATURE (Tstgl_ :' . . . .. LEAD TEMPERATURE, 1116" 182' (1.58mm0.8mm) from case for 10s max (TL)
| SYMBOL | PARAMETER | CONDITIONS | MIN | MAX | UNIT |
| VCESM VCEO lc ICM lB IBM -IBM Ptot Tstg | Collector-emitter voltage peak value Collector-emitter voltage (open base) Collector current (DC) Collector current peak value Base current (DC) Base current peak value Reverse base current peak value 1 Total power dissipation Storage temperature Junction temperature | VBE=OV Tns " 25 aC | -55 | 1500 800 8 15 4 6 5 32 150 150 | V V A A A A A W oC oC |
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