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MC34063 Datasheet(Fiches technique) 3 Page - ON Semiconductor

Numéro de pièce MC34063
Description  DC-to-DC Converter Control Circuits
Télécharger  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

MC34063 Datasheet(HTML) 3 Page - ON Semiconductor

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MC34063A, MC33063A
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 3.], unless otherwise specified.)
Characteristics
Symbol
Min
Typ
Max
Unit
OSCILLATOR
Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)
fosc
24
33
42
kHz
Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Ichg
24
35
42
µA
Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)
Idischg
140
220
260
µA
Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)
Idischg/Ichg
5.2
6.5
7.5
Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)
Vipk(sense)
250
300
350
mV
OUTPUT SWITCH (Note 4.)
Saturation Voltage, Darlington Connection
(ISW = 1.0 A, Pins 1, 8 connected)
VCE(sat)
1.0
1.3
V
Saturation Voltage (Note 5.)
(ISW = 1.0 A, RPin 8 = 82 Ω to VCC, Forced β ] 20)
VCE(sat)
0.45
0.7
V
DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)
hFE
50
75
Collector Off–State Current (VCE = 40 V)
IC(off)
0.01
100
µA
COMPARATOR
Threshold Voltage
TA = 25°C
TA = Tlow to Thigh
Vth
1.225
1.21
1.25
1.275
1.29
V
Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)
MC33063A, MC34063A
MC33363AV
Regline
1.4
1.4
5.0
6.0
mV
Input Bias Current (Vin = 0 V)
IIB
–20
–400
nA
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
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:
Forced
b of output switch :
IC output
IC driver – 7.0 mA *
w 10
* The 100
Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.


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