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PDF RM34063 Data sheet ( Hoja de datos )
| Número de pieza | RM34063 | |
| Descripción | DC/DC CONVERTER CONTROLLOR | |
| Fabricantes | REACTOR | |
| Logotipo |  |
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DESCRIPTION
The RM34063 by Analog Integrations
Corporation, an improved second source over the
industrial standard RM34063, is a monolithic
control circuit containing the primary functions
required for DC/DC converters.The device consists
of an internal temperature compensated reference,
comparator, controlled duty cycle oscillator with an
active current limit circuit, driver and high current
output switch. This device is specifically designed
to be incorporated in stepdown, step-up and
voltage-inverting applications with a minimum
number of external components. The ±1.8%
internal reference and low quiescent current of
2.4mA are among the improvements of the device
over the competition.
RM34063
DC/DC CONVERTER CONTROLLOR
FEATURES
•3V to 40V Input Voltage Operation
•Internal 1.2A Peak Current Switch
•Internal ±1.8% Reference
•Low Quiescent Current at 2.4mA
•Frequency Operation from 100Hz to 100KHz.
•Current limit
Applications
•Saver for Cellular phones
•DC-DC Converter Module
TYPICAL APPLICATION
+5V_800mA
L1 220uH_1.5A
+ C2
D1
470uF_10V IN5819
CT
470pF
U1
1 SC
2 SE
3 TC
4 GND
DRI 8
IPK 7
Vcc 6
FB 5
RM34063
RS 0.33_1%
+Vin
+ C1
470uF
RA 4.5K_1%
C1 22nF
RB
1.5K_1%
Note: VOUT = VFB x (1+RA/RB) .
VFB=1.25V
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1 page  
■APPLICATION INFORMATION
•DESIGN FORMULA TABLE
Calculation
Step-down
Step-up
Voltage-inverting
ton
t off
( )ton + toff MAX
VOUT + VF
VIN − VSAT − VOUT
1
FMIN
VOUT + VF − VIN (MIN )
VIN (MIN ) − VSAT
1
FMIN
VOUT + VF
VIN − VSAT
1
FMIN
CT 4 ×10−5 ton
4 ×10−5 ton
4 ×10−5 ton
IC (SWITCH )
2IOUT (MAX )
2
I
out
(
MAX
)
(
ton
+ toff
toff
)
2
I
out
(
MAX
)
(
ton
+ toff
toff
)
RS 0.33
0.33 0.33
IC (SWITCH )
IC (SWITCH )
IC (SWITCH )
L(MIN )
⎜⎛ VIN (MIN ) − VSAT − VOUT
⎜⎝ IC (SWITCH )
⎟⎟⎠⎞ton ( MA
⎜⎛ VIN (MIN ) − VSAT
⎜⎝ IC(SWITCH )
⎟⎟⎠⎞ton ( MAX
⎜⎛ VIN (MIN ) − VSAT
⎜⎝ IC(SWITCH )
⎟⎟⎠⎞ton ( MAX
CO IC(SWITCH ) (ton + toff )
IOUT × ton
8VRIPPLE ( P− P )
8VRIPPLE ( P− P )
IOUT × ton
8VRIPPLE ( 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.
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.
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5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet RM34063.PDF ] | |
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