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MC34063A Datasheet(Fiches technique) 5 Page - Analog Intergrations Corporation

Numéro de pièce MC34063A
Description  DC/DC CONVERTER CONTROL CIRCUIT
Télécharger  9 Pages
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Fabricant  AIC [Analog Intergrations Corporation]
Site Internet  http://www.analog.com.tw
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MC34063A
DC/DC CONVERTER CONTROL CIRCUIT
SPEC NO: DS34063A-00
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
5
! BLOCK DIAGRAM
Q
R
S
8
7
6
5
4
3
2
1
Q1
IS
CT
-
+
Q2
80
DRI
IPK
VCC
FB
GND
TC
SC
SE
Oscillator
Comparator
1.25V
Reference
Voltage
! PIN DESCRIPTIONS
PIN 1: SC
- 1.6A switch collector
PIN 2: SE
- Darlington switch emitter
PIN 3: TC
- Oscillator timing capacitor
PIN 4: GND - Power GND
PIN 5: FB
- Feedback comparator inverting input
PIN 6: VCC - Power supply input
PIN 7: IPK
- Highside current sense input,
VCC - VIPK=300mV
PIN 8: DRI
- Drive collector
! APPLICATION INFORMATION
DESIGN FORMULA TABLE
CALCULATION
STEP-DOWN
STEP-UP
VOLTAGE-INVERTING
t
t
ON
OFF
V
+ V
V
- V
- V
OUT
F
IN(MIN)
SAT
OUT
V
+ V
V
V
- V
OUT
F
IN(MIN)
IN(MIN)
SAT
-
V
+ V
V
- V
OUT
F
IN
SAT
(t
ON + tOFF) MAX
1
FMIN
1
FMIN
1
FMIN
C
T
4x10-5t
ON
4 x 10-5t
ON
4 x 10-5t
ON
I
C (SWITCH)
2I
OUT(MAX)
2I
OUT(MAX) ()
t+ t
t
ON
OFF
OFF
2I
OUT(MAX) ()
t+ t
t
ON
OFF
OFF
RS
0.33/I
C(SWITCH)
0.33/ I
C (SWITCH)
0.33/ I
C (SWITCH)
L(MIN)

V
- V
- V
I
t
IN(MIN)
SAT
OUT
C(SWITCH)
ON(MAX)

V
- V
I
t
IN(MIN)
SAT
C(SWITCH)
ON(MAX)

V
- V
I
t
IN(MIN)
SAT
C(SWITCH)
ON(MAX)
Co
I
(t
+ t
8V
C ( SWITCH)
ON
OFF
RIPPLE( P - P )
)
I
t
V
OUT
ON
RIPPLE(P - P)
I
t
V
OUT
ON
RIPPLE(P - P)




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