ꢀ ꢁꢂ ꢂ ꢃ ꢄ ꢂꢅ ꢆ ꢀ ꢁꢂ ꢇꢃ ꢄꢂ ꢅ
ꢈ ꢉ ꢊ ꢋꢅ ꢌ ꢍꢅ ꢎ ꢏꢐ ꢐ ꢑꢒ ꢓꢏꢔ ꢁꢎꢓ ꢕꢖꢗ ꢍꢘꢒ ꢕꢖ ꢙ ꢑꢚ ꢕ ꢒꢁ ꢛꢕꢖ ꢙ ꢘꢍꢙ ꢔ ꢜꢅꢒꢐ ꢘꢑ
SLLS636D – DECEMBER 2004 – REVISED MARCH 2005
recommended operating conditions
MIN
MAX
UNIT
V
CC
Supply voltage
3
40
V
MC33063A
MC34063A
−40
0
85
70
T
A
Operating free-air temperature range
°C
electrical characteristics, V
diagram)
= 5 V, T = full operating range (unless otherwise noted) (see block
A
CC
OSCILLATOR
PARAMETER
Oscillator frequency
Charge current
T
MIN
24
TYP
33
MAX
42
UNIT
kHz
µA
TEST CONDITIONS
= 0 V, C = 1 nF
A
f
I
I
I
V
V
V
V
25°C
25°C
25°C
25°C
25°C
osc
PIN5
T
= 5 V to 40 V
= 5 V to 40 V
24
35
42
chg
CC
Discharge current
140
5.2
250
220
6.5
300
260
7.5
350
µA
dischg
CC
/I
dischg chg
Discharge-to-charge current ratio
Current-limit sense voltage
= V
PIN7
CC
V
mV
I
= I
Ipk
dischg chg
OUTPUT SWITCH (see Note 3)
PARAMETER
T
MIN
TYP
MAX
UNIT
TEST CONDITIONS
= 1 A, pins 1 and 8 connected
A
Saturation voltage – Darlington
V
V
I
I
Full range
Full range
1
1.3
V
CE(sat)
SW
connection
Saturation voltage – non-Darlington
connection (see Note 4)
= 1 A, R
PIN8
= 82 Ω to V ,
CC
SW
0.45
0.7
V
CE(sat)
forced ꢀ ꢀ 20
h
DC current gain
I
= 1 A, V
= 40 V
CE
= 5 V
25°C
50
75
FE
SW
CE
I
Collector off-state current
V
Full range
0.01
100
µA
C(off)
NOTES: 3. Low duty-cycle pulse testing is used to maintain junction temperature as close to ambient temperature as possible.
4. In the non-Darlington configuration, if the output switch is driven into hard saturation at low switch currents (≤300 mA) and high driver
currents (≥30 mA), it may take up to 2 µs for the switch to come out of saturation. This condition effectively shortens the off time at
frequencies ≥30 kHz, becoming magnified as temperature increases. The following output drive condition is recommended in the
non-Darlington configuration:
Forced ꢀ of output switch = I − 7 mA) ≥ 10,
/ (I
C,SW C,driver
where ꢀ 7 mA is required by the 100-Ω resistor in the emitter of the driver to forward bias the V of the switch.
be
COMPARATOR
PARAMETER
T
MIN
1.225
1.21
TYP
MAX
UNIT
TEST CONDITIONS
A
25°C
1.25 1.275
1.29
V
th
Threshold voltage
V
Full range
Full range
Full range
∆V
th
Threshold-voltage line regulation
Input bias current
V
V
= 5 V to 40 V
1.4
5
mV
nA
CC
I
IB
= 0 V
−20 −400
IN
TOTAL DEVICE
PARAMETER
T
MIN
MAX
UNIT
TEST CONDITIONS
= 5 V to 40 V, C = 1 nF,
A
V
V
V
CC
T
I
Supply current
= V , V
CC PIN5
> V ,
th
Full range
4
mA
CC
PIN7
PIN2
= GND, all other pins open
3
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TI [ TEXAS INSTRUMENTS ]
