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MC34063ACS View Datasheet(PDF) - Analog Intergrations

Part Name
Description
View to exact match
MC34063ACS
AIC
Analog Intergrations AIC
MC34063ACS Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
MC34063A
n APPLICATION INFORMATION
DESIGN FORMULA TABLE
CALCULATION
STEP-DOWN
tON
VOUT + VF
tOFF
V - V - V IN(MIN)
SAT
OUT
(tON + tOFF) MAX
CT
1
FMIN
4x10-5tON
IC (SWITCH)
2IOUT(MAX)
RS
L(MIN)
Co
0.33/IC(SWITCH)
( V - V - V )t IN(MIN)
SAT
OUT
ON(MAX)
IC(SWITCH)
I ( t + t C( SWITCH) ON
OFF)
8 VRIPPLE (P - P )
VSAT - Saturation voltage of the output switch.
VF - Forward voltage drop of the ringback
rectifier
The following power supply characteristics must
be chosen:
VIN - Nominal input voltage.
VOUT - Desired output voltage,
VOUT =1.25 (1 + RB/RA)
IOUT - Desired output current.
STEP-UP
V + V V OUT
F - IN(MIN)
V - V IN(MIN)
SAT
1
FMIN
4 x 10-5tON
2IOUT(MAX)
( t ON + t OFF )
t OFF
0.33/ IC (SWITCH)
( V - V )t IN(MIN)
SAT
ON(MAX)
IC(SWITCH)
I t OUT ON
VRIPPLE(P - P)
VOLTAGE-INVERTING
VOUT + VF
VIN - VSAT
1
FMIN
4 x 10-5tON
2IOUT(MAX)
(
t ON + t OFF )
t OFF
0.33/ IC (SWITCH)
( V - V )t IN(MIN)
SAT
ON(MAX)
IC(SWITCH)
I t OUT ON
VRIPPLE(P - P)
FMIN - Minimum desired output switching
frequency at the selected values for VIN
and IOUT.
VRIPPLE (P-P)- Desired peak-to-peak output ripple
voltage. In practice, the calculated value
will need to be increased due to the
capacitor equivalent series resistance and
board layout. The ripple voltage should be
kept to a low value since it will directly
effect the line and load regulation.
6
 

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