DC-DC Converter Control Circuits
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, V
CC
=5V, T
A
=T
LOW
to T
HIGH
, unless otherwise specified, see note 2)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
MC34063A/B
TYP.
MAX.
UNIT
OSCILLATOR
F
OSC
I
CHG
I
DISCHG
I
DISCHG
/I
CHG
V
IPK(SENSE)
Frequency
Charge Current
Discharge Current
Discharge to Charge Current Ratio
Current Limit Sense Voltage
V
PIN5
=0V, C
T
=1nF, T
A
=25℃
V
CC
=5 to 40V, T
A
=25℃
V
CC
=5 to 40V, T
A
=25℃
Pin 7= V
CC
, T
A
=25℃
I
CHG
=I
DISCHG
, T
A
=25℃
24
24
140
5.2
250
33
35
220
6.5
300
42
42
260
7.5
350
mV
KHz
㎂
㎂
OUTPUT SWITCH
V
CE(SAT)
V
CE(SAT)
h
FE
I
C(OFF)
Saturation Voltage,
Darlington connection
Saturation Voltage
DC Current Gain
Collector Off-State Current
I
SW
=1A, Pins 1,8 connected
I
SW
=1A, R
PIN8
=82Ω to V
CC
,
Forced
β
~ 20
I
SW
=1A, V
CE
=5V, T
A
=25℃
V
CE
= 40V
50
1.0
0.45
75
0.01
100
㎂
1.3
0.7
V
V
COMPARATOR
V
TH
REG
LINE
I
IB
Threshold Voltage
Threshold Voltage Line Regulation
Input Bias Current
T
A
=25℃
1.225
1.21
1
-5
1.25
1.275
1.29
5
-400
V
V
mV
nA
T
A
=T
LOW
to T
HIGH
V
CC
= 3 to 40V
V
IN
= 0V
TOTAL DEVICE
V
CC
= 5 to 40V, C
T
=1nF
Pin7= V
CC
, V
PIN5
>V
TH
, Pin2=GND
Remaining pins open
for MC34063A/B
I
CC
Supply Current
1.4
4
mA
Note 1. Maximum package power dissipation limit must be observed.
Note 2. T
LOW
= '-30
℃
, T
HIGH
= '+125
℃
Note 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 switch :
Ι
C(OUTPUT)
Ι
C(DRIVER)
- 7.0mΑ *
≥
10
* Currentless due to a built in 1K
Ω
anti-leakage resistor
Jan. 2011 - Rev. 1.0
-
4
-
HTC
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
