DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)
Collector Off–State Current (VCE = 40 V)
NOTES:
3. Tlow = 0°C for MC34063A, – 40°C for MC33063A, AV
Thigh = +70°C for MC34063A, + 85°C for MC33063A, +125°C for MC33063AV
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents (≥ 30 mA),
it may take up to 2.0
µs
for it to come out of saturation. This condition will shorten the off time at frequencies
≥
30 kHz, and is magnified at high
temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non–Darlington
configuration is used, the following output drive condition is recommended:
IC output
Forced
b
of output switch :
10
IC driver – 7.0 mA *
*The 100
Ω
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
w
2
MOTOROLA ANALOG IC DEVICE DATA
MC34063A MC33063A
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5.0 V, TA = Tlow to Thigh [Note 3], unless otherwise specified.)
Characteristics
COMPARATOR
Threshold Voltage
TA = 25°C
TA = Tlow to Thigh
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Input Bias Current (Vin = 0 V)
TOTAL DEVICE
Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC,
VPin 5 > Vth, Pin 2 = Gnd, remaining pins open)
ICC
–
–
4.0
mA
Vth
1.225
1.21
Regline
–
–
IIB
–
1.4
1.4
– 20
5.0
6.0
– 400
nA
1.25
–
1.275
1.29
mV
V
Symbol
Min
Typ
Max
Unit
NOTES:
3. Tlow = 0°C for MC34063A, – 40°C for MC33063A, AV
Thigh = +70°C for MC34063A, + 85°C for MC33063A, +125°C for MC33063AV
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
5. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents (≥ 30 mA),
it may take up to 2.0
µs
for it to come out of saturation. This condition will shorten the off time at frequencies
≥
30 kHz, and is magnified at high
temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non–Darlington
configuration is used, the following output drive condition is recommended:
IC output
Forced
b
of output switch :
10
IC driver – 7.0 mA *
*The 100
Ω
resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
w
Figure 1. Output Switch On–Off Time versus
Oscillator Timing Capacitor
t on–off , OUTPUT SWITCH ON-OFF TIME (
µ
s)
1000
500
200
100
50
20
10
5.0
2.0
1.0
0.01 0.02
0.05 0.1 0.2
0.5 1.0 2.0
CT, OSCILLATOR TIMING CAPACITOR (nF)
5.0 10
toff
V OSC , OSCILLATOR VOLTAGE (V)
VCC = 5.0 V
Pin 7 = VCC
Pin 5 = Gnd
TA = 25°C
ton
Figure 2. Timing Capacitor Waveform
VCC = 5.0 V
Pin 7 = VCC
Pin 2 = Gnd
Pins 1, 5, 8 = Open
CT = 1.0 nF
TA = 25°C
10
µs/DIV
MOTOROLA ANALOG IC DEVICE DATA
3
200 mV/DIV
MC34063A MC33063A
Figure 3. Emitter Follower Configuration Output
Saturation Voltage versus Emitter Current
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0
0.2
0.4
0.6
0.8
1.0
1.2
IE, EMITTER CURRENT (A)
1.4
1.6
VCC = 5.0 V
Pins 1, 7, 8 = VCC
Pins 3, 5 = Gnd
TA = 25°C
(See Note 4)
VCE(sat), SATURATION VOLTAGE (V)
VCE(sat), SATURATION VOLTAGE (V)
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.2
0.4
0.6
0.8
1.0
1.2
IC, COLLECTOR CURRENT(A)
1.4
1.6
VCC = 5.0 V
Pin 7 = VCC
Pins 2, 3, 5 = Gnd
TA = 25°C
(See Note 4)
Figure 4. Common Emitter Configuration Output
Switch Saturation Voltage versus
Collector Current
Darlington Connection
Forced
β
= 20
V IPK(sense), CURRENT LIMIT SENSE VOLTAGE (V)
Figure 5. Current Limit Sense Voltage
versus Temperature
400
380
I CC , SUPPLY CURRENT (mA)
360
340
320
300
280
260
240
220
200
–55
–25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
VCC = 5.0 V
Ichg = Idischg
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
0
Figure 6. Standby Supply Current versus
Supply Voltage
CT = 1.0 nF
Pin 7 = VCC
Pin 2 = Gnd
5.0
10
15
20
25
30
VCC, SUPPLY VOLTAGE (V)
35
40
NOTE:
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.
4
MOTOROLA ANALOG IC DEVICE DATA
MC34063A MC33063A
Figure 7. Step–Up Converter
170
µH
L
8
180
S Q
R
7
Ipk
Osc
6
+
100
VCC
+
– Comp.
5
R2
R1
2.2 k
47 k
330
+
CO
1.25 V
Ref
Reg
4
1.0
µH
Vout
28 V/175 mA
+
100
Vout
Q2
Q1
2
1N5819
Rsc
0.22
Vin
12 V
CT
3
CT
1500
pF
1
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Output Ripple With Optional Filter
Conditions
Vin = 8.0 V to 16 V, IO = 175 mA
Vin = 12 V, IO = 75 mA to 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Results
30 mV =
±0.05%
10 mV =
±0.017%
400 mVpp
87.7%
40 mVpp
Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A
8a. External NPN Switch
8b. External NPN Saturated Switch
(See Note 5)
8
1
Vout
R
8
1
Vout
7
2
Rsc
7
2
Rsc
Vin
6
Vin
6
0 for
R
constant Vin
³
NOTE:
5. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (≤ 300 mA) and high driver currents
(≥ 30 mA), it may take up to 2.0
µs
to come out of saturation. This condition will shorten the off time at frequencies
≥
30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non–Darlington
configuration is used, the following output drive condition is recommended.
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