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PDF MC34065-H Data sheet ( Hoja de datos )
| Número de pieza | MC34065-H | |
| Descripción | High Performance Dual Channel Current Mode Controllers | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Order this document by MC34065–H/D
MC34065-H, L
High Performance
MC33065-H, L
Dual Channel Current
Mode Controllers
The MC34065–H,L series are high performance, fixed frequency, dual
current mode controllers. 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
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. These devices are
available in dual–in–line and surface mount packages.
The MC34065–H has UVLO thresholds of 14 V (on) and 10 V (off), ideally
suited for off–line converters. The MC34065–L is tailored for lower voltage
applications having UVLO thresholds of 8.4 V (on) and 7.8 V (off).
• 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
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
VCC 16
5.0V VCC
Reference
Undervoltage
R Lockout
R
Vref
Undervoltage
Lockout
Oscillator
+
–
Error
Amp 1
Latching
PWM 1
Drive Output 1
7
Current Sense 1
6
+
–
Error
Amp 2
Gnd 8
Latching
PWM 2
Drive Gnd 9
Drive Output 2
10
Current Sense 2
11
HIGH PERFORMANCE
DUAL CHANNEL CURRENT
MODE CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
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–H
MC34065DW–L
MC34065P–H
TA = 0° to +70°C
SO–16L
Plastic DIP
MC34065P–L
MC33065DW–H
MC33065DW–L
MC33065P–H
MC33065P–L
TA = –40° to +85°C
SO–16L
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 0
1
1 page  
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MC34065–H, L MC33065–H, L
Figure 9. Reference Load Regulation
Figure 10. Reference Line Regulation
VCC = 15 V
IO = 1.0 mA to 10 mA
TA = 25°C
VCC = 11 V to 15 V
TA = 25°C
1.0 ms/DIV
1.0 ms/DIV
Figure 11. Output Saturation Voltage
versus Load Current
0
–2.0
VCC
Source Saturation VCC = 15 V
(Load to Ground) 80 µs Pulsed Load
120 Hz Rate
–4.0
TA = –55°C
TA = 25°C
–6.0
4.0
2.0
TA = –55°C
TA = 25°C
Gnd
Sink Saturation
(Load to VCC)
0
0 100 200 300 400
IO, OUTPUT LOAD CURRENT (mA)
90% –
10% –
Figure 12. Output Waveform
VCC = 15 V
CL = 1.0 nF
TA = 25°C
100 ns/DIV
Figure 13. Output Cross Conduction Current
VCC = 15 V
CL = 15 pF
TA = 25°C
100 ns/DIV
MOTOROLA ANALOG IC DEVICE DATA
Figure 14. Supply Current versus Supply Voltage
32
RT = 10 k
CT = 3.3 nF
24
VFB = 0 V
Current Sense = 0 V
TA = 25°C
16
–L Suffix
–H Suffix
8.0
0
0 4.0 8.0 12 16 20
VCC, SUPPLY VOLTAGE (V)
5
5 Page 
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MC34065–H, L MC33065–H, L
Figure 25. Bipolar Transistor Drive
IB Vin
+
0
–
Base Charge
Removal
C1
RS
The totem–pole outputs can furnish negative base current for enhanced
transistor turn–off, with the addition of capacitor C1.
Figure 26. Isolated MOSFET Drive
VCC
16
Vin
5.0Vref
+
+–
–
+
–+
_
Isolation
Boundary
PWM
Latch 1
S
–Q
+R
7
D1
6R
ǒ Ǔ+ *Ipk
V(Pin 6) 1.4 NP
3RS NS
C
NS
Q1
NP
Figure 27. Dual Charge Pump Converter
VCC = 15V
16
+
47
15 2.5V R
R
1
Bias
20k
12k
1.0nF
3
2
4
5
Osc.
+
–
EA1
1.0mA
2R
1.0V
5.0Vref
+
+–
_
+
–+
_
–
+
R
PWM
Latch 1
S
Q
R
250µA
14
1.0mA
+
–
13 EA2
2R
1.0V
–
+
R
12
8
PWM
Latch 2
S
RQ
R
9
10
27 10
1N5819
7
10
++
47
+VO ≈ 2.0 VCC
Connect to Pin 4 for
closed–loop regulation.
R2
R1
ǒ Ǔ6
) VO + 2.5
R2
R1
)
1
10
27 10
1N5819
+
–VO ≈ –VCC
10 10
47 +
Output Load Regulation
11
IO (mA) +VO (V) –VO (V)
0 28.43 –13.89
1.0 27.72 –12.90
5.0 27.04 –12.25
10 26.20 –11.44
50 20.52 –5.80
The capacitor’s equivalent series resistance must limit the Drive Output current to 400 mA. An additional series resistor may be required
when using tantalum or other low ESR capacitors. The positive output can provide excellent line and load regulation by connecting the
R2/R1 resistor divider as shown.
MOTOROLA ANALOG IC DEVICE DATA
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MC34065-H.PDF ] | |
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