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MC34025 데이터시트 PDF




ON Semiconductor에서 제조한 전자 부품 MC34025은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 MC34025 자료 제공

부품번호 MC34025 기능
기능 (MC33025 / MC34025) High Speed Single-Ended PWM Controller
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MC34025 데이터시트, 핀배열, 회로
MC34025, MC33025
High Speed Double−Ended
PWM Controller
The MC34025 series are high speed, fixed frequency, double−ended
pulse width modulator controllers optimized for high frequency
operation. They are specifically designed for Off−Line and
DC−to−DC converter applications offering the designer a cost
effective solution with minimal external components. These
integrated circuits feature an oscillator, a temperature compensated
reference, a wide bandwidth error amplifier, a high speed current
sensing comparator, steering flip−flop, and dual high current totem
pole outputs ideally suited for driving power MOSFETs.
Also included are protective features consisting of input and
reference undervoltage lockouts each with hysteresis, cycle−by−cycle
current limiting, and a latch for single pulse metering.
The flexibility of this series allows it to be easily configured for
either current mode or voltage mode control.
Features
50 ns Propagation Delay to Outputs
Dual High Current Totem Pole Outputs
Wide Bandwidth Error Amplifier
Fully−Latched Logic with Double Pulse Suppression
Latching PWM for Cycle−By−Cycle Current Limiting
Soft−Start Control with Latched Overcurrent Reset
Input Undervoltage Lockout with Hysteresis
Low Startup Current (500 mA Typ)
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Internally Trimmed Reference with Undervoltage Lockout
45% Maximum Duty Cycle (Externally Adjustable)
Precision Trimmed Oscillator
Voltage or Current Mode Operation to 1.0 MHz
Functionally Similar to the UC3825
Pb−Free Packages are Available*
16
Vref
4
Clock
5
RT
CT
6
7
Ramp
Error Amp 3
Output
Noninverting 2
Input
Inverting
Input 1
8
Soft−Start
Oscillator
Error
Amp
5.1V
Reference
UVLO
Latching
PWM and
Steering
Flip Flop
Soft−Start
10 Ground
This device contains 227 active transistors.
Figure 1. Simplified Application
15
VCC
13
VC
14
Output B
11
Output A
Power
12 Ground
9
Current
Limit/
Shutdown
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16
1
16
1
MARKING
DIAGRAMS
16
PDIP−16
P SUFFIX
CASE 648
MC3x025P
AWLYYWWG
1
16
SO−16WB
DW SUFFIX
CASE 751G
MC3x025DW
AWLYYWWG
1
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
Error Amp
Inverting Input
Error Amp
Noninverting Input
Error Amp Output
1
2
3
16 Vref
15 VCC
14 Output B
Clock
RT
CT
Ramp
Soft−Start
4 13
5 12
6 11
7 10
89
(Top View)
VC
Power Ground
Output A
Ground
Current Limit/
Shutdown
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
*For additional information on our Pb−Free strategy
and soldering details, please download the
ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
October, 2005 − Rev. 7
1
Publication Order Number:
MC34025/D




MC34025 pdf, 반도체, 판매, 대치품
MC34025, MC33025
100 k
1
3 5 79
VCC = 15 V
TA = + 25°C
24 68
CT=
10 k 1. 100 nF
2. 47 nF
3. 22 nF
4. 10 nF
5. 4.7 nF
6. 2.2 nF
1.0 k 7. 1.0 nF
8. 470 pF
9. 220 pF
470
100 1000 104 105 106
fosc, OSCILLATOR FREQUENCY (Hz)
107
Figure 2. Timing Resistor versus
Oscillator Frequency
1200
RT = 1.2 k
1000
1.0 MHz
CT = 1.0 nF
800
VCC = 15 V
600
400
400 kHz
RT = 3.6 k
CT = 1.0 nF
200 RT = 36 k
50 kHz
CT = 1.0 nF
0
− 55 − 25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 3. Oscillator Frequency versus Temperature
120 0
100
80
60
Phase
40
20
Gain
45
90
0 135
− 20
10
100 1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 4. Error Amp Open Loop Gain and
Phase versus Frequency
1.3
1.28
VCC = 15 V
Pin 7(9) = 0 V
1.26
1.24
1.22
1.2
−55 −25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 5. PWM Comparator Zero Duty Cycle
Threshold Voltage versus Temperature
2.55 V
2.5 V
2.45 V
0.1 ms/DIV
Figure 6. Error Amp Small Signal
Transient Response
3.0 V
2.5 V
2.0 V
0.1 ms/DIV
Figure 7. Error Amp Large Signal
Transient Response
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MC34025 전자부품, 판매, 대치품
MC34025, MC33025
VCC Vin
16
Vref
4
Clock
5
RT
CT
6
Ramp 7
Error Amp Output
3
2
Noninverting Input
Inverting Input
1
Soft−Start
CSS
8
Reference
Regulator
4.2 V
Oscillator
PWM
1.25 V Comparator
Error
Amp
+
9.0 mA
Vref
UVLO
R
Q
S
PWM Latch
VCC
UVLO
9.2 V
Q
T
Q
Steering
Flip Flop
Current
Limit
R
Q
S
Soft−Start Latch
0.5 V
Shutdown
15
VCC
13
VC
14
Output B
11
Output A
12
Power Ground
1.0 V
9
Current Limit/
Shutdown
1.4 V
10
Ground
Figure 19. Representative Block Diagram
CT
Clock
Soft−Start
Error Amp Output
Ramp
PWM
Comparator
Output A
Output B
Figure 20. Current Limit Operating Waveforms
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