MC34063A Ver la hoja de datos (PDF) - Unspecified

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MC34063A

DC-DC Converter Control Circuits

Unspecified 

DC-DC Converter Control Circuits

MC34063A

ELECTRICAL CHARACTERISTICS( Refer to the test circuits, VCC=5V, Ta=TLOW to THIGH, unless

otherwise specified, see note 2)

OSCILLATOR

SYMBOL

PARAMETER

FOSC Frequency

Ichg Charge Current

Idischg Discharge Current

Idischg/Ichg Discharge to Charge Current Ratio

Vipk(sense) Current Limit Sense Voltage

TEST CONDITIONS

Vpin5= 0 V ,CT= 1nF ,Ta= 25oC

VCC= 5 to 40V ,Ta= 25oC

VCC= 5 to 40V ,Ta= 25oC

Pin 7= VCC ,Ta= 25oC

Ichg= Idischg ,Ta= 25oC

MIN.

24

24

140

5.2

250

TYP.

33

33

200

6.2

300

MAX. UNIT

42 KHz

42 ㎂

260 ㎂

7.5

350 ㎷

OUTPUT SWITCH

SYMBOL

PARAMETER

VCE(sat) Saturation Voltage,

Darlington connection

VCE(sat) Saturation Voltage

hFE

IC(off)

DC Current Gain

Collector Off-State Current

TEST CONDITIONS

MIN. TYP. MAX. UNIT

ISW= 1A ,Pins 1,8 connected

1 1.3 V

ISW= 1A ,Rpin8= 82Ω to VCC,

Forced β ~ 20

ISW= 1A, VCE= 5V, Ta= 25oC

VCE= 40V

0.45 0.7 V

50 120

0.01 100 ㎂

COMPARATOR

SYMBOL

PARAMETER

Vth Threshold Voltage

Regline Threshold Voltage Line Regulation

IIB Input Bias Current

TEST CONDITIONS

Ta= 25oC

Ta= TLOW to THIGH

VCC= 3 to 40V

VIN= 0V

MIN.

1.225

1.21

TYP.

1.25

1

-5

MAX. UNIT

1.275 V

1.29 V

5㎷

-400 ㎁

TOTAL DEVICE

SYMBOL

PARAMETER

ICC Supply Current

VSTART-UP Start-up Voltage(note 4)

TEST CONDITIONS

MIN.

VCC= 5 to 40V, CT=1㎋

Pin7= VCC ,Vpin5>Vth, Pin2=GND

Remaining pins open

for MC34063A

Ta= 25oC ,CT=1㎌ ,Pin5= 0V

for MC34063A

TYP.

2.5

2.1

MAX. UNIT

4㎃

V

Notes:

1) Maximum package power dissipation limit must be observed.

2) TLOW= 0oC, THIGH= 70oC

3) If Darlington configuration is not used, care must be taken to avoid deep saturation of output switch.

The resulting switch-off time may be adversely affected.

In a Darlington configuration the following output driver condition is suggested:

Forced β of output current switch= ICOUTPUT/(ICDRIVER-1㎃*)≥10

* Current less due to a built in 1KΩ antileakage resistor.

4) Start-up Voltage is the minimum Power Supply Voltage at which the internal oscillator begains to work.

HTC

3

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