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PDF MC34065 Data sheet ( Hoja de datos )
| Número de pieza | MC34065 | |
| Descripción | High Performance Dual Channel Current Mode Controllers | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MC34065 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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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
MC34065
MC33065
HIGH PERFORMANCE
DUAL CHANNEL CURRENT
MODE CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
16
1
Vref 15
1
Sync Input
3
RT
CT
2
Voltage
Feedback 1 4
Compensation 1
5
Drive Output 2
Enable 14
Voltage
Feedback 2 13
Compensation 2
12
Representative Block Diagram
5.0 V
R Reference
R Vref
Undervoltage
Lockout
Oscillator
+
–
Error
Amp 1
VCC 16
VCC
Undervoltage
Lockout
Latching
PWM 1
Drive
7 Output 1
Current
6 Sense 1
+
–
Error
Amp 2
Latching
PWM 2
Gnd 8
Drive Gnd 9
This device contains 208 active transistors.
Drive
10 Output 2
Current
11 Sense 2
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
Operating
Temperature Range Package
MC34065DW
MC34065P
SO–16L
TA = 0° to +70°C Plastic DIP
MC33065DW
MC33065P
SO–16L
TA = –40° to +85°C Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
3–451
1 page  
2.55 V
MC34065 MC33065
Figure 3. Error Amp Small–Signal
Transient Response
VCC = 15 V
AV = –1.0
TA = 25°C
Figure 4. Error Amp Large–Signal
Transient Response
VCC = 15 V
AV = –1.0
3.0 V TA = 25°C
2.50 V
2.5 V
2.45 V
1.0 µs/DIV
2.0 V
1.0 µs/DIV
Figure 5. Error Amp Open Loop Gain and
Phase versus Frequency
100 0
80 Gain
60
VCC = 15 V
VO = 1.5 V to 2.5 V
RL = 100 k
TA = 25°C
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. Current Sense Input Threshold
versus Error Amp Output Voltage
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)
0
–4.0
–8.0
–12
–16
–20
–24
0
Figure 7. Reference Voltage Change
versus Source Current
VCC = 15 V
TA = –55°C
TA = 25°C
TA = 125°C
20 40 60 80 100
Iref, REFERENCE SOURCE CURRENT (mA)
120
Figure 8. Reference Short Circuit Current
versus Temperature
120
VCC = 15 V
RL ≤ 0.1 Ω
100
80
60
–55
–25 0 25 50 75
TA, AMBIENT TEMPERATURE (°C)
100
125
MOTOROLA ANALOG IC DEVICE DATA
3–455
5 Page 
MC34065 MC33065
Figure 21. Adjustable Reduction of Clamp Level
with Soft–Start
VCC
Vin
16
Vref
15 R
5.0 Vref
+ 17 V
–+
Bias _
R+
1 20 k + –
3
Osc
2
_
PWM
Latch 1
Q1
7
4
+
–
EA1
VClamp –
2R +
0.5 V R
S
Q
R
R2 5
6 RS
C R1 MPSA63
Where: 0 ≤ VClamp ≤ 0.5 V
[Ipk(max)
VClamp
RS
ǒ Ǔ[ )VClamp
1.67
R2 1
R1
+tSoft–Start
ln 1
1– VC
)C
R1R2
R1 R2
3 VClamp
Figure 22. MOSFET Parasitic Oscillations
VCC
16
Vin
5.0 Vref
+
+–
–
+ 17 V
–+
_
Rg Q1
PWM
Latch 1
S
–
+
Q
R
7 D1
1N5819
6 RS
Series gate resistor Rg may be needed to damp high frequency
parasitic oscillations caused by the MOSFET input capacitance
and any series wiring inductance in the gate–source circuit. Rg
will decrease the MOSFET switching speed. Schottky diode
D1 is required if circuit ringing drives the output pin below
ground.
Figure 23. Current Sensing Power MOSFET
VCC
16
Vin
5.0 Vref
+
+–
_
+
–+
_
PWM
Latch 1
S
–
+
Q
R
17 V
Control Circuitry
Ground to Pin 8
D SENSEFET
S Power Ground to
G Input Source Return
7K
M
Drive Ground
to Pin 9
6 RS
1/4W
[ )VPin 6
RS Ipk RDS(on)
RDM(on) RS
If: SENSEFET = MTP10N10M
RS = 200
Then: VPin 6 = 0.075 Ipk
Virtually lossless current sensing can be achieved with the implementation
of a SENSEFET power switch. For proper operation during over current
conditions, a reduction of the Ipk(max) clamp level must be implemented.
Refer to Figures 19 and 21.
Figure 24. Current Waveform Spike Suppression
VCC
16
Vin
5.0 Vref
+
+–
–
+ 17 V
–+
_
PWM
Latch 1
S
–
+
Q
R
7
Q1
R
6 C RS
The addition of the RC filter will eliminate instability caused by
the leading edge spike on the current waveform.
MOTOROLA ANALOG IC DEVICE DATA
3–461
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MC34065.PDF ] | |
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