DC-DC Converter Control Circuits
MC34063A
ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC=5V, Ta=TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
SYMBOL
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
V
pin5= 0 V ,CT= 1nF ,Ta= 25oC
FOSC
24
24
33
35
42 KHz
Frequency
VCC= 5 to 40V ,Ta= 25oC
VCC= 5 to 40V ,Ta= 25oC
Pin 7= VCC ,Ta= 25oC
Ichg
42
260
7.5
㎂
㎂
Charge Current
Idischg
140
5.2
250
220
6.5
300
Discharge Current
I
dischg/Ichg
Discharge to Charge Current Ratio
Current Limit Sense Voltage
Vipk(sense)
350
㎷
I
chg= Idischg ,Ta= 25oC
OUTPUT SWITCH
SYMBOL
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
VCE(sat)
ISW= 1A ,Pins 1,8 connected
1.0
1.3
V
Saturation Voltage,
Darlington connection
Saturation Voltage
VCE(sat)
0.45
0.7
V
ISW= 1A ,Rpin8= 82Ω to VCC,
Forced β ~ 20
SW= 1A, VCE= 5V, Ta= 25oC
hFE
50
75
DC Current Gain
I
IC(off)
VCE= 40V
0.01
100
㎂
Collector Off-State Current
COMPARATOR
SYMBOL
Vth
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
Ta= 25oC
1.225 1.25 1.275
V
V
Threshold Voltage
Ta= TLOW to THIGH
VCC= 3 to 40V
VIN= 0V
1.21
1.29
5
Regline
IIB
1
Threshold Voltage Line Regulation
Input Bias Current
㎷
㎁
-5
-400
TOTAL DEVICE
SYMBOL
ICC
PARAMETER
TEST CONDITIONS
MIN. TYP. MAX. UNIT
1.4
4
VCC= 5 to 40V, CT=1㎋
Pin7= VCC ,Vpin5>Vth, Pin2=GND
Remaining pins open
for MC34063A
Supply Current
㎃
Notes:
1) Maximum package power dissipation limit must be observed.
TLOW= '-30℃, THIGH= '+125℃
2)
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= CI OUTPUT/(ICDRIVER-1㎃*)≥10
* Current less due to a built in 1KΩ antileakage resistor.
May. 2009 - Rev. 1.2
HTC
− 3 −
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
