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부품번호 | MC33025 기능 |
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기능 | High Speed Double-Ended PWM Controller | ||
제조업체 | Motorola Semiconductors | ||
로고 | |||
전체 20 페이지수
High Speed Double-Ended
PWM Controller
Order this document by MC34025/D
MC34025
MC33025
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.
• 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 Start–Up Current (500 µA Typ)
• Internally Trimmed Reference with Undervoltage Lockout
• 90% Maximum Duty Cycle (Externally Adjustable)
• Precision Trimmed Oscillator
• Voltage or Current Mode Operation to 1.0 MHz
• Functionally Similar to the UC3825
16
Vref
4
Clock
5
RT
CT
6
7
Ramp
Error Amp 3
Output
Noninverting 2
Input
Inverting
Input 1
8
Soft–Start
Simplified Application
Oscillator
5.1V
Reference
UVLO
Latching
PWM and
Error
Amp
Steering
Flip Flop
Soft–Star
t
10 Ground
This device contains 227 active transistors.
15
VCC
13
VC
14
Output B
11
Output A
Power
12 Ground
9
Current
Limit/
Shutdown
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
PIN CONNECTIONS
Error Amp
Inverting Input
Error Amp
Noninverting Input
Error Amp Output
1
2
3
16 Vref
15 VCC
14 Output B
Clock 4
RT 5
13 VC
12 Power Ground
CT 6
Ramp 7
Soft–Start 8
11 Output A
10 Ground
9 Current Limit/
Shutdown
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC33025DW
SO–16L
TA = – 40° to +105°C
MC33025P
Plastic DIP
MC34025DW
MC34025P
TA = 0° to +70°C
SO–16L
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 1
1
MC34025 MC33025
100 k
1
Figure 1. Timing Resistor versus
Oscillator Frequency
3 579
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. Oscillator Frequency versus Temperature
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
0
– 55 – 25
50 kHz
RT = 36 k
CT = 1.0 nF
0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
125
Figure 3. Error Amp Open Loop Gain and
Phase versus Frequency
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. PWM Comparator Zero Duty Cycle
Threshold Voltage versus Temperature
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)
2.55 V
Figure 5. Error Amp Small Signal
Transient Response
2.5 V
2.45 V
0.1 µs/DIV
Figure 6. Error Amp Large Signal
Transient Response
3.0 V
2.5 V
2.0 V
0.1 µs/DIV
4 MOTOROLA ANALOG IC DEVICE DATA
4페이지 MC34025 MC33025
Figure 18. Representative Block Diagram
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 µA
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
CT
Clock
Soft–Start
Error Amp Output
Ramp
PWM
Comparator
Output A
Output B
Figure 19. Current Limit Operating Waveforms
MOTOROLA ANALOG IC DEVICE DATA
7
7페이지 | |||
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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 ] |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |