DC-DC Converter Control Circuits
MC34063A
ELECTRICAL CHARACTERISTICS( Refer to the test circuits, V
CC=5V, Ta=TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
Frequency
Vpin5= 0 V ,CT= 1nF ,Ta= 25
oC
Charge Current
VCC= 5 to 40V ,Ta= 25
oC
Discharge Current
VCC= 5 to 40V ,Ta= 25
oC
Discharge to Charge Current Ratio
Pin 7= VCC ,Ta= 25
oC
Current Limit Sense Voltage
Ichg= Idischg ,Ta= 25
oC
OUTPUT SWITCH
Saturation Voltage,
ISW= 1A ,Pins 1,8 connected
Darlington connection
Saturation Voltage
ISW= 1A ,Rpin8= 82Ω to VCC,
Forced β ~ 20
DC Current Gain
ISW= 1A, VCE= 5V, Ta= 25
oC
Collector Off-State Current
VCE= 40V
COMPARATOR
Threshold Voltage
Ta= 25
oC
Ta= TLOW to THIGH
Threshold Voltage Line Regulation
VCC= 3 to 40V
Input Bias Current
VIN= 0V
TOTAL DEVICE
Supply Current
VCC= 5 to 40V, CT=1㎋
Pin7= VCC ,Vpin5>Vth, Pin2=GND
Remaining pins open
for MC34063A
Start-up Voltage(note 4)
Ta= 25
oC ,C
T=1㎌ ,Pin5= 0V
for MC34063A
Notes:
1) Maximum package power dissipation limit must be observed.
2) TLOW= 0
oC, T
HIGH= 70
oC
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= ICOUTPUT/(ICDRIVER-1㎃
*)≥10
* Current less due to a built in 1KΩ antileakage resistor.
4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begains to work.
HTC
TEST CONDITIONS
MIN.
TYP.
MAX. UNIT
FOSC
24
33
42
KHz
SYMBOL
PARAMETER
㎂
Idischg
140
200
260
㎂
Ichg
24
33
42
Vipk(sense)
250
300
350
㎷
Idischg/Ichg
5.2
6.2
7.5
UNIT
VCE(sat)
1
1.3
V
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
0.45
0.7
TYP.
MAX.
0.01
100
V
hFE
50
120
VCE(sat)
㎂
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX. UNIT
IC(off)
Vth
1.225
1.25
1.275
15
V
1.21
1.29
V
TEST CONDITIONS
MIN.
㎷
IIB
-5
-400
㎁
Regline
TYP.
MAX. UNIT
ICC
2.5
4
㎃
SYMBOL
PARAMETER
VSTART-UP
2.1
V
3
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