34063API datasheet(3/15 Pages) ONSEMI

3 / 15 page

MC34063A, MC33063A, SC34063A, SC33063A, NCV33063A

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ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 4], unless otherwise specified.)

Characteristics

Symbol

Min

Typ

Max

Unit

OSCILLATOR

Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)

fosc

kHz

Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)

Ichg

Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)

Idischg

140

220

260

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

OUTPUT SWITCH (Note 5)

Saturation Voltage, Darlington Connection

(ISW = 1.0 A, Pins 1, 8 connected)

VCE(sat)

−

1.0

1.3

Saturation Voltage (Note 6)

(ISW = 1.0 A, RPin 8 = 82 W to VCC, Forced b ] 20)

VCE(sat)

−

0.45

0.7

DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)

hFE

−

Collector Off−State Current (VCE = 40 V)

IC(off)

−

0.01

100

COMPARATOR

Threshold Voltage

TA = 25°C

TA = Tlow to Thigh

Vth

1.225

1.21

1.25

−

1.275

1.29

Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V)

MC33063, MC34063

MC33063V, NCV33063

Regline

−

1.4

5.0

6.0

Input Bias Current (Vin = 0 V)

IIB

−

−20

− 400

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

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product

performance may not be indicated by the Electrical Characteristics if operated under different conditions.

4. Tlow = 0°C for MC34063, SC34063; − 40°C for MC33063, SC33063, MC33063V, NCV33063

Thigh = +70°C for MC34063, SC34063; + 85°C for MC33063, SC33063; +125°C for MC33063V, NCV33063

5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

6. 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 ms 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

W resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.

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