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부품번호 | MC34025 기능 |
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기능 | (MC33025 / MC34025) High Speed Single-Ended PWM Controller | ||
제조업체 | ON Semiconductor | ||
로고 | |||
전체 20 페이지수
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, 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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4
4페이지 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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7
7페이지 | |||
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다운로드 | [ MC34025.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
MC34023 | (MC33023 / MC34023) High Speed Single-Ended PWM Controller | ON Semiconductor |
MC34025 | (MC33025 / MC34025) High Speed Single-Ended PWM Controller | ON Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |