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PDF MC33065 Data sheet ( Hoja de datos )
| Número de pieza | MC33065 | |
| Descripción | High Performance Dual Channel Current Mode Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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MC34065, MC33065
High Performance
Dual Channel Current
Mode Controller
The MC34065 is a high performance, fixed frequency, dual current
mode controllers. It is specifically designed for off−line and dc−to−dc
converter applications offering the designer a cost effective solution
with minimal external components. This integrated circuit feature a
unique oscillator for precise duty cycle limit and frequency control, a
temperature compensated reference, two high gain error amplifiers,
two current sensing comparators, Drive Output 2 Enable pin, and two
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 of each output.
The MC34065 and MC33065 are available in dual−in−line and
surface mount packages.
• Unique Oscillator for Precise Duty Cycle Limit and Frequency
Control
• Current Mode Operation to 500 kHz
• Automatic Feed Forward Compensation
• Separate Latching PWMs for Cycle−By−Cycle Current Limiting
• Internally Trimmed Reference with Undervoltage Lockout
• Drive Output 2 Enable Pin
• Two High Current Totem Pole Outputs
• Input Undervoltage Lockout with Hysteresis
• Low Startup and Operating Current
VCC 16
Vref
15
R
5.0 V
Reference
VCC
Undervoltage
Lockout
1
Sync Input
3
RT
CT
2
Voltage
Feedback 1 4
Compensation 1
5
R Vref
Undervoltage
Lockout
Oscillator
+
−
Error
Amp 1
Latching
PWM 1
Drive
7 Output 1
Current
6 Sense 1
Drive Output 2
Enable 14
Voltage
Feedback 2 13
Compensation 2
12
+
−
Error
Amp 2
Gnd 8
Latching
PWM 2
Drive Gnd 9
Drive
10 Output 2
Current
1 Sense 2
1
This device contains 208 active transistors.
Figure 1. Representative Block Diagram
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 3
1
http://onsemi.com
16
1
16
1
PDIP−16
P SUFFIX
CASE 648
SO−16W
DW SUFFIX
CASE 751G
PIN CONNECTIONS
Sync Input 1
CT 2
RT 3
Voltage Feedback 1 4
Compensation 1 5
Current Sense 1 6
Drive Output 1 7
Gnd 8
16 VCC
15 Vref
14
Drive Output 2
Enable
13 Voltage Feedback 2
12 Compensation 2
11 Current Sense 2
10 Drive Output 2
9 Drive Gnd
(Top View)
ORDERING INFORMATION
Device
Package
Shipping
MC34065DW−L
SO−16W 47 Units/Rail
MC34065P−L
PDIP−16 25 Units/Rail
MC33065DW−L
SO−16W 47 Units/Rail
MC33065DW−H SO−16W 47 Units/Rail
MC33065DW−HR2 SO−16W 1000 Tape & Reel
MC33065P−H
PDIP−16 25 Units/Rail
MC33065P−L
PDIP−16 25 Units/Rail
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 16 of this data sheet.
Publication Order Number:
MC34065/D
1 page  
2.55 V
2.50 V
MC34065, MC33065
VCC = 15 V
AV = −1.0
TA = 25°C
3.0 V
2.5 V
VCC = 15 V
AV = −1.0
TA = 25°C
2.45 V
1.0 μs/DIV
Figure 4. Error Amp Small−Signal
Transient Response
2.0 V
1.0 μs/DIV
Figure 5. Error Amp Large−Signal
Transient Response
100
80 Gain
60
VCC = 15 V
VO = 1.5 V to 2.5 V
RL = 100 k
TA = 25°C
0
30
60
40 90
20 Phase 120
0 150
−20 180
10 100 1.0 k 10 k 100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 6. Error Amp Open Loop Gain and
Phase versus Frequency
0.6
VCC = 15 V
0.5 TA = 125°C
0.4
0.3 TA = 25°C
0.2 TA = −55°C
0.1
0
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
VO, ERROR AMP OUTPUT VOLTAGE (V)
Figure 7. Current Sense Input Threshold
versus Error Amp Output Voltage
0
−4.0
−8.0
−12
−16
−20
−24
0
VCC = 15 V
TA = 125°C
TA = 25°C
TA = −55°C
20 40 60 80 100
Iref, REFERENCE SOURCE CURRENT (mA)
Figure 8. Reference Voltage Change
versus Source Current
120
120
VCC = 15 V
RL ≤ 0.1 Ω
100
80
60
−55
−25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
125
Figure 9. Reference Short Circuit Current
versus Temperature
http://onsemi.com
5
5 Page 
MC34065, MC33065
15
External
Sync
Input
220 pF
RT CT
1
3
2
4
5
R
Bias
R
20 k
Osc
+
− EA1
2R
0.5 V R
The external diode clamp is required if the negative Sync current
is greater than −5.0 mA.
Figure 18. External Clock Synchronization
8 4 RA
6
5.0 k
+
−R
5
5.0 k
Q
2
+
−
S
7
3
5.0 k MC1455
1 RB
C
f
+
1.08
ǒRA ) RBǓC
Dmax Drive Output 1 =
RB
RA ) RB
Vref
15
R
Bias
R
1 20 k
3
Osc
2
4+
2R
5 − EA1 0.5 V
To additional MC34065’s
Dmax
Drive
Output
2
=
RA
RA ) RB
Figure 19. External Duty Cycle Clamp and
Multi−Unit Synchronization
R
VCC
16
Vref
15
R
5.0 Vref
+
− _+
17 V
Bias +
1 R 20 k +_ −
Vin
3
2
4
R2
R1 5
Osc
1.0 mA
+
−
EA1
VClamp −
2R +
0.5 V R
PWM
Latch 1
S
Q
R
7
6
ǒ Ǔ ǒ ǓVClamp [
1.67
R2 ) 1
) 0.33 x 10–3
R1R2
R1 ) R2
R1
Ipk(max)
[
VClamp
RS
Where: 0 ≤ VClamp ≤ 0.5 V
Q1
RS
Figure 20. Adjustable Reduction of Clamp Level
Vref
15
R
Bias
R
1 20 k
3
2
4
1.0 M
5
C
Osc
+
−
EA1
1.0 mA
2R
0.5 V
tSoft−Start ≈ 2100 C in μF
R
Figure 21. Soft−Start Circuit
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11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MC33065.PDF ] | |
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