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参数资料
| 型号： | MC34063EBD |
| 厂商： | 意法半导体 |
| 元件分类： | DC/DC变换器 |
| 英文描述： | DC-DC CONVERTER CONTROL CIRCUITS |
| 中文描述： | DC - DC变换器控制电路 |
| 文件页数： | 3/15页 |
| 文件大小： | 1483K |
| 代理商： | MC34063EBD |
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, V
CC
= 5V, T
a
= T
LOW
to T
HIGH
, unless
otherwise specified, see note 2)
OSCILLATOR
Symbol
f
OSC
I
chg
I
dischg
I
dischg
/I
chg
Discharge to Charge
Current Ratio
V
ipk(sense)
Current Limit Sense Voltage
Parameter
Test Conditions
Min.
24
Typ.
33
Max.
42
Unit
KHz
μ
A
μ
A
Frequency
V
pin5
= 0 V C
T
= 1 nF T
a
= 25
o
C
V
CC
= 5 to 40 V T
a
= 25
o
C
V
CC
= 5 to 40 V T
a
= 25
o
C
Pin 7 = V
CC
T
a
= 25
o
C
Charge Currernt
Discharge Current
24
140
33
200
42
260
5.2
6.2
7.5
I
chg
= I
dischg
T
a
= 25
o
C
250
300
350
mV
OUTPUT SWITCH
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
CE(sat)
Saturation Voltage,
Darlington Connection
Saturation Voltage
I
SW
= 1 A Pins 1, 8 connected
1
1.3
V
V
CE(sat)
I
SW
= 1 A R
pin8
= 82
to V
CC
,
Forced
β
~ 20
I
SW
= 1 A V
CE
= 5 V T
a
= 25
o
C
V
CE
= 40 V
0.45
0.7
V
h
FE
I
C(off)
DC Current Gain
Collector Off-State Current
50
120
0.01
100
μ
A
COMPARATOR
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
th
Threshold Voltage
T
a
= 25
o
C
T
a
= T
LOW
to T
HIGH
V
CC
= 3 to 40 V
1.225
1.21
1.25
1.275
1.29
V
V
Reg
line
Threshold Voltage Line
Regulation
Input Bias Current
1
5
mV
I
IB
V
IN
= 0 V
-5
-400
nA
TOTAL DEVICE
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
CC
Supply Current
V
CC
= 5 to 40 V C
T
= 1 nF
Pin 7 = V
CC
V
pin5
> V
th
Pin 2 = GND
Remaining pins open
for
MC34063A
for
MC34063E
T
a
= 25
o
C C
T
= 1
μ
F Pin 5 = 0 V
for
MC34063A
for
MC34063E
2.5
1.5
4
4
mA
mA
V
START-UP
Start-up Voltage (note 4)
2.1
1.5
V
V
NOTES:
1) Maximum package power dissipation limit must be observed.
2) T
LOW
= 0
C, T
HIGH
= 70
C (AC and EC series); T
LOW
= -40
o
C, T
HIGH
= 85
o
C (AB series); T
LOW
= -40
o
C, T
HIGH
= 125
o
C (EB series).
3) If Darlington configuration is not used, care must be taken to avoid deep saturation of output switch. The resulting switch-off time may be
adversely affected. In a Darlington configuration the following output driver condition is suggested:
Forced
β
of output current switch = I
COUTPUT
/(I
CDRIVER
- 1mA*)
≥
10
* Current less due to a built in 1K
antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begins to work.
MC34063A/E
3/15
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