mc34063acs Analog Intergrations Corporation, mc34063acs Datasheet - Page 5

• Manufacturer Part Number: mc34063acs
• Description: Dc/dc Converter Control Circuit
• Manufacturer: Analog Intergrations Corporation

!
!
!
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
BLOCK DIAGRAM
PIN DESCRIPTIONS
APPLICATION INFORMATION
DESIGN FORMULA TABLE
PIN 1: SC
PIN 2: SE
PIN 3: TC
PIN 4: GND - Power GND
(t
C
I
RS
L(MIN)
Co
t
C (SWITCH)
t
OFF
ON
ON
T
CALCULATION
+ t
OFF
)
MAX
- 1.6A switch collector
- Darlington switch emitter
- Oscillator timing capacitor


V
IN(MIN)
V
I
C ( SWITCH)
GND
IN(MIN)
STEP-DOWN
SC
SE
TC
0.33/I
I
8V
C(SWITCH)
- V
V
4x10
2I
OUT
- V
RIPPLE ( P - P )
F
OUT(MAX)
SAT
3
4
(t
MIN
C(SWITCH)
2
1
1
+ V
SAT
-5
ON
- V
Q1
t
ON
+ t
- V
F
OUT
Reference
Voltage
Q2
1.25V
OFF

OUT
80
t
ON(MAX)
)
CT
Q
Oscillator
R
S
Comparator
PIN 5: FB
PIN 6: VCC - Power supply input
PIN 7: IPK
PIN 8: DRI
+
-


www.analog.com.tw
TEL: [phone] FAX:[phone]
2I
V
IS
V
OUT(MAX)
IN(MIN)
OUT
0.33/ I
V
I
STEP-UP
C(SWITCH)
DC/DC CONVERTER CONTROL CIRCUIT
IN(MIN)
4 x 10
V
+ V
I
RIPPLE(P - P)
OUT
- V
F
MIN
C (SWITCH)
1
(
- V
6
5
8
7
F
t + t
SAT
t
-5
ON
ON
- Feedback comparator inverting input
- Highside current sense input,
- Drive collector
-
t
ON
V
t
VCC - V
SAT
OFF

DRI
IPK
VCC
FB
IN(MIN)
t
ON(MAX)
OFF
)
IPK
=300mV
VOLTAGE-INVERTING


2I
V
OUT(MAX)
IN(MIN)
0.33/ I
SPEC NO: DS34063A-00
I
MC34063A
C(SWITCH)
V
V - V
4 x 10
V
OUT
IN
I
RIPPLE(P - P)
OUT
- V
F
MIN
C (SWITCH)
1
(
+ V
t + t
SAT
t
-5
ON
ON
SAT
t
ON
t
OFF

F
t
ON(MAX)
OFF
)
5