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MC34063A Arkusz danych(PDF) 3 Page - STMicroelectronics

Numer części MC34063A
Szczegółowy opis  DC-DC CONVERTER CONTROL CIRCUITS
Download  15 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (Refer to the test circuits, VCC = 5V, Ta =TLOW to THIGH, unless
otherwise specified, see note 2)
OSCILLATOR
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
fOSC
Frequency
Vpin5 =0 V
CT = 1 nF
Ta =25
oC
243342
KHz
Ichg
Charge Currernt
VCC = 5 to 40 V
Ta =25
oC
243342
µA
Idischg
Discharge Current
VCC = 5 to 40 V
Ta =25
oC
140
200
260
µA
Idis chg/Ichg Discharge to Charge
Current Ratio
Pin 7 = VCC
Ta =25
oC
5.2
6.2
7.5
Vipk( sense) Current Limit Sense Voltage
Ichg =Idischg
Ta =25
oC
250
300
350
mV
OUTPUT SWITCH
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VCE(sat)
Saturation Voltage,
Darlington Connection
ISW = 1 A
Pins 1, 8 connected
1
1.3
V
VCE(sat)
Saturation Voltage
ISW =1 A
Rpin8 =82
Ω to VCC,
Forced
β ~20
0.45
0.7
V
hFE
DC Current Gain
ISW =1 A
VCE =5 V
Ta =25
oC50
120
IC(off)
Collector Off-State Current
VCE = 40 V
0.01
100
µA
COMPARATOR
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Vth
Threshold Voltage
Ta =25
oC
Ta =TLOW to THIGH
1.225
1.21
1.25
1. 275
1.29
V
V
Reg line
Threshold Voltage Line
Regulation
VCC = 3 to 40 V
1
5
mV
IIB
Input Bias Current
VIN = 0 V
-5
-400
nA
TOTAL DEVICE
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
ICC
Supply Current
VCC = 5 to 40 V
CT =1 nF
Pin 7 = VCC
Vpin5 >Vth Pin 2 = GND
Remaining pins open
2.5
4
mA
NOTES:
1) Maximum package power dissipation limit must be observed.
2) TLOW =0
oC, THIGH =70 oC (AC series); TLOW = -40 oC, THIGH =85 oC (AB series).
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 - 1mA*) ≥ 10
* Current less due to a built in 1K
Ω antileakage resistor.
MC34063A
3/15


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