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MC34063AQ8のメーカーはCystech Electonicsです、この部品の機能は「DC-to-DC Converter Control Circuit」です。 |
部品番号 | MC34063AQ8 |
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部品説明 | DC-to-DC Converter Control Circuit | ||
メーカ | Cystech Electonics | ||
ロゴ | |||
このページの下部にプレビューとMC34063AQ8ダウンロード(pdfファイル)リンクがあります。 Total 7 pages
CYStech Electronics Corp.
DC-to-DC Converter Control Circuit
MC34063AQ8
wwSwp.eDca. tNaoS.h:eCe5t041UQ.c8om
Issued Date : 2003.03.21
Revised Date :2005.06.02
Page No. : 1/7
Description
The MC34063AQ8 is a monolithic control circuit containing the primary functions required for
DC-to-DC converters. This device consists of an internal temperature compensated reference,
comparator, control- led duty cycle oscillator with an active current limit circuit, driver and high current
output switch.
Features
• 3V to 40V Input Voltage Operation
• Internal 1.6A Peak Current Switch
• Internal ±1.8% Reference
• Low Quiescent Current at 1.6mA
• Frequency Operation from 100Hz~100KHz
• Current Limiting
Applications
• Saver for Cellular Phone
• DC-DC Converter Module
Typical Application Circuit
Fig1.Saver Circuit for Cellular Phone
RSC
Vin
C1
100µF
MC34063A
81
72
63
54
RB
33kΩ
RA
5.6kΩ
L1
200µH
CT
470ρF
D1
1N5819
Vout
Cout
220µF
MC34063AQ8
CYStek Product Specification
1 Page Block Diagram
CYStech Electronics Corp.
wwSwp.eDca. tNaoS.h:eCe5t041UQ.c8om
Issued Date : 2003.03.21
Revised Date :2005.06.02
Page No. : 3/7
SC
Pin1:1.6A Switch Collector
SE
Pin2:Darlington Switch Emitter
TC
Pin3:Oscilletor Timing Capacitor
GND
Pin4:Power GND
Q2 Q S
Q1 R
80Ω
CT IPK
Oscillator
1.25V
Reference Voltage
Comparator
+
-
DRI
Pin8:Driver Collector
IPK
Pin7:Highside Current Sense
Input, VCC-VIPK=300mV
VCC
Pin6:Power Supply Input
FB
Pin5:Feedback Comparator
Inverting Input
Application Information
Design Formula Table
Calculation
Step-Down
Step-Up
Voltage-Inverting
ton / toff
Vout+VF /
Vin(min) -Vsat-VOut
Vout+VF-Vin(min) /
Vin(min)-Vsat
|Vout| + VF /
Vin-Vsat
(ton + toff) max
CT
1/Fmin
4*10-5ton
1/Fmin
4*10-5ton
1/Fmin
4*10-5ton
IC(switch)
2*Iout(max)
2*Iout(max)(ton+toff/toff)
2*Iout(max)(ton+toff/toff)
RS 0.3 / IC(switch)
0.3 / IC(switch)
0.3 / IC(switch)
L(min)
(Vin(min)-Vsat-Vout / IC(switch)) (Vin(min)-Vsat / IC(switch))
*ton(max)
*ton(max)
(Vin(min)-Vsat/ IC(switch))
*ton(max)
CO
IC(switch)*(ton+toff) /
8VRipple(P-P)
Iout*ton / VRipple(P-P)
Iout*ton / VRipple(P-P)
Vsat : Saturation voltage of the output switch.
VF : Forward voltage drop of the ringback rectifier.
The following power supply characteristics must be chosen :
Vin : Nominal input voltage.
Vout : Desired output voltage. |Vout|=1.25*(1+RB/RA)
Iout - Desired output current
Fmin : Minimum desired output switching frequency at the selected values for Vin and Iout.
VRipple(P-P) : Desired peak to peak output ripple voltage in practice, the calculated value will need to be increased
due to the capacitor equivalent series resistance and board layout. The ripple voltage should be kept to a low value
since it will directly effect the line and load regulation.
MC34063AQ8
CYStek Product Specification
3Pages CYStech Electronics Corp.
Characteristic Curves
wwSwp.eDca. tNaoS.h:eCe5t041UQ.c8om
Issued Date : 2003.03.21
Revised Date :2005.06.02
Page No. : 6/7
Output Switch On-Off Time vs Oscillator
Timing Capacitance
1000
VCC=5.0V
Pin 7=VCC
Pin 5=GND
100 TA=25℃
ton
10 toff
1
0.01
0.1 1
Oscillator Timing Capacitance---CT(nF)
10
Emitter Follower Configuration Output
Saturation Voltage vs Emitter Current
1.8
1.7
1.6
1.5
VCC=5V
1.4 Pins 1,7,8=VCC
Pins 3,5=Gnd
1.3 TA=25℃
1.2 (See Note )
1.1
1
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Emitter Current---IE(A)
Common Emitter Configuration Output Switch
Saturation Voltage vs Collector Current
1.1
1
0.9
0.8 VCC=5V
0.7 Pin 7=VCC
Darlington Connection
0.6 Pins 2,3,5=Gnd
0.5 TA=25℃
0.4 (See Note)
0.3 Forced β=20
0.2
0.1
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Collector Current---IC(A)
Current Limit Sense Voltage vs Temperature
400
380
360 VCC=5.0V
Ichg=Idischg
340
320
300
280
260
240
220
200
-75
-50 -25 0 25 50 75 100
Ambient Temperature---TA(℃)
125
Standby Supply Current vs Supply Voltage
3.6
3.2
2.8
2.4
2
1.6
1.2
CT=10nF
Pin 7=VCC
0.8 Pin 2=Gnd
0.4
0
0 5 10 15 20 25 30 35 40
Supply Voltage---VCC(V)
Note: Low duty cycle pulse techniques are used during test
to maintain junction temperature as close to ambient
temperature as possible.
MC34063AQ8
CYStek Product Specification
6 Page | |||
ページ | 合計 : 7 ページ | ||
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部品番号 | 部品説明 | メーカ |
MC34063AQ8 | DC-to-DC Converter Control Circuit | Cystech Electonics |