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MC33065 Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer MC33065
Beschreibung High Performance Dual Channel Current Mode Controllers
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 30 Seiten
MC33065 Datasheet, Funktion
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






MC33065 Datasheet, Funktion
MC34065 MC33065
Figure 9. Reference Load Regulation
VCC = 15 V
IO = 1.0 mA to 10 mA
TA = 25°C
Figure 10. Reference Line Regulation
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
–1.0
VCC
Source Saturation VCC = 15 V
(Load to Ground) 80 µs Pulsed Load
TA = 25°C 120 Hz Rate
–2.0
TA = –55°C
2.0 TA = –55°C
1.0
TA = 25°C
Gnd Sink Saturation
(Load to VCC)
0
0 200 400 600 800
IO, OUTPUT LOAD CURRENT (mA)
90% –
10% –
Figure 12. Output Waveform
VCC = 15 V
CL = 1.0 nF
TA = 25°C
50 ns/DIV
Figure 13. Output Cross Conduction Current
VCC = 15 V
CL = 15 pF
TA = 25°C
100 ns/DIV
Figure 14. Supply Current versus Supply Voltage
32
RT = 8.2 k
CT = 3.3 nF
24
VFB1,2 = 0 V
Current Sense 1,2 = 0 V
TA = 25°C
16
8.0
0
0 4.0 8.0 12 16 20
VCC, SUPPLY VOLTAGE (V)
3–456
MOTOROLA ANALOG IC DEVICE DATA

6 Page









MC33065 pdf, datenblatt
MC34065 MC33065
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
5.0 V Ref
+
+
+ 17 V
+
_
PWM
Latch 1
S
Q
ǒ Ǔ+ R
+Ipk
V(Pin 6) 1.4 NP
3RS NS
Isolation
Boundary
7 D1
6R
C
NS
Q1
NP
Figure 27. Dual Charge Pump Converter
VCC = 15 V
16
+ 47
15 2.5 V R
R
1
Bias
20 k
3
12 k 1.0 nF 2
4
5
Osc
+
EA1
1.0 mA2R
0.5 V
5.0 Vref
+
+
_
+
+
_
+
R
PWM
Latch 1
S
Q
R
17 V
250 µA
14
PWM
Latch 2
1.0 mA
+ 2R
13 EA2
+
0.5 V R
S
RQ
R
12
89
15 10
7+
1N5819
+
47
+VO 2.0 VCC
Connect to Pin 4 for R2
closed–loop regulation. R1
ǒ Ǔ) + )6
VO
2.5
R2
R1
1
15 10
+
10
1N5819
47 +
–VO –VCC
Output Load Regulation
11 IO (mA) +VO (V) –VO (V)
0 29.8 –14.7
1.0 28.3 –13.4
5.0 27.9 –12.9
10 27.5 –12.5
50 24.4 –9.5
The capacitor’s equivalent series resistance must limit the Drive Output current to 1.0 A. 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.
3–462
MOTOROLA ANALOG IC DEVICE DATA

12 Page





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