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MC34063A Datasheet(Fiches technique) 2 Page - ON Semiconductor

Numéro de pièce MC34063A
Description  DC-to-DC CONVERTER CONTROL CIRCUITS
Télécharger  12 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
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MC34063A MC33063A
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Power Supply Voltage
VCC
40
Vdc
Comparator Input Voltage Range
VIR
– 0.3 to + 40
Vdc
Switch Collector Voltage
VC(switch)
40
Vdc
Switch Emitter Voltage (VPin 1 = 40 V)
VE(switch)
40
Vdc
Switch Collector to Emitter Voltage
VCE(switch)
40
Vdc
Driver Collector Voltage
VC(driver)
40
Vdc
Driver Collector Current (Note 1)
IC(driver)
100
mA
Switch Current
ISW
1.5
A
Power Dissipation and Thermal Characteristics
Plastic Package, P, P1 Suffix
TA = 25°C
PD
1.25
W
Thermal Resistance
R
θJA
100
°C/W
SOIC Package, D Suffix
TA = 25°C
PD
625
W
Thermal Resistance
R
θJA
160
°C/W
Operating Junction Temperature
TJ
+150
°C
Operating Ambient Temperature Range
TA
°C
MC34063A
0 to +70
MC33063AV
–40 to +125
MC33063A
– 40 to + 85
Storage Temperature Range
Tstg
– 65 to +150
°C
NOTES: 1. Maximum package power dissipation limits must be observed.
2. ESD data available upon request.
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 (Note 5)
(ISW = 1.0 A, Pins 1, 8 connected)
VCE(sat)
1.0
1.3
V
Saturation Voltage, Darlington Connection
(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
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:
*The 100
Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.
Forced
b of output switch :
IC output
IC driver – 7.0 mA *
w 10




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