MC34063AB 查看數據表（PDF） - STMicroelectronics

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MC34063AB

DC/DC converter control circuits

STMicroelectronics 

Electrical characteristics

MC34063AB - MC34063AC - MC34063EB - MC34063EC

4

Electrical characteristics

(Refer to the test circuits, VCC = 5 V, TA = TLOW to THIGH, unless otherwise specified, see

Note 2)

Table 5. Oscillator

Symbol

Parameter

Test conditions

fOSC

Frequency

ICHG

Charge current

IDISCHG Discharge current

IDISCHG/ICHG

Discharge to charge

current ratio

VPIN5 = 0V, CT = 1 nF, TA = 25°C

VCC = 5 to 40V, TA = 25°C

VCC = 5 to 40V, TA = 25°C

PIN 7 = VCC, TA = 25°C

VIPK(sense) Current limit sense voltage ICHG = IDISCHG, TA = 25°C

Min. Typ. Max. Unit

24

33

42 kHz

24

33

42

µA

140 200 260 µA

5.2

6.2

7.5

µA

250 300 350 mV

Table 6.

Symbol

Output switch

Parameter

Test conditions

VCE(sat)

Saturation voltage, darlington

connection

ISW = 1 A, PIN 7, 8 connected

VCE(sat) Saturation voltage

ISW = 1 A, RPIN8 = 82 Ω to VCC

Forced β ~ 20

hFE

IC(off)

DC current gain

Collector off-state current

ISW = 1 A,VCE = 5 V, TA = 25°C

VCE = 40 V

Min. Typ. Max. Unit

1

1.3

V

0.45 0.7

V

50 120

0.01 100 µA

Table 7.

Symbol

Comparator

Parameter

VTH Threshold voltage

Regline

IIB

Threshold voltage line

regulation

Input bias current

Test conditions

TA = 25°C

TA = TLOW to THIGH

VCC = 3 to 40 V

VIN = 0 V

Min. Typ. Max. Unit

1.225 1.25 1.275

V

1.21

1.29

1

5

mV

-5 -400 nA

6/23

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