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Teilenummer | MC33065-H |
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Beschreibung | (MC3x065-x) High Performance Dual Channel Current Mode Controllers | |
Hersteller | ON Semiconductor | |
Logo | ||
Gesamt 18 Seiten www.DataSheet4U.com
MC34065−H, L
MC33065−H, L
High Performance
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
VCC 16
Vref
1
5
1
Sync Input
3
RT
CT
2
Voltage
Feedback 1
4
Compensation 1
5
5.0V
Reference
R
R
Vref
Undervoltage
Lockout
Oscillator
+
−
Error
Amp 1
VCC
Undervoltage
Lockout
Latching
PWM 1
Drive Output 1
7
Current Sense
61
Drive Output
2
Enable
14
Voltage
Feedback 2 13
Compensation 2
12
+
−
Error
Amp 2
Latching
PWM 2
Gnd 8
Drive Gnd 9
Representative Block Diagram
Drive Output 2
10
Current Sense
11 2
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HIGH PERFORMANCE
DUAL CHANNEL CURRENT
MODE CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO−16L)
16
1
PIN CONNECTIONS
Sync Input 1
CT 2
RT 3
Voltage Feedback 1 4
Compensation 1 5
Current Sense 1 6
Drive Output 1 7
16 VCC
15 Vref
14 Drive Output 2 Enable
13 Voltage Feedback
2
12 Compensation
2
11 Current Sense
2
10 Drive Output 2
Gnd 8
(Top View)
9 Drive
Gnd
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC34065DW−H
SO−16L
MC34065DW−L
MC34065P−H
TA = 0° to +70°C
Plastic DIP
MC34065P−L
MC33065DW−H
MC33065DW−L
MC33065P−H
MC33065P−L
TA = −40° to +85°C
SO−16L
Plastic DIP
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 2
1
Publication Order Number:
MC34065−H/D
2.55 V
2.50 V
MC34065−H, L
VCC = 15 V
AV = −1.0
TA = 25°C
3.0 V
2.50 V
VCC = 15 V
AV = −1.0
TA = 25°C
2.45 V
1.0 μs/DIV
Figure 3. Error Amp Small−Signal
Transient Response
2.0 V
1.0 μs/DIV
Figure 4. 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 5. Error Amp Open Loop Gain and
Phase versus Frequency
1.2
VCC = 15 V
1.0
0.8 TA = 125°C
0.6 TA = 25°C
0.4 TA = −55°C
0.2
0
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0
VO, ERROR AMP OUTPUT VOLTAGE (V)
Figure 6. 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 7. Reference Voltage Change
versus Source Current
120
120
VCC = 15 V
RL ≤ 0.1 Ω
100
80
60
−55
−25 0 25 50 75 100
TA, AMBIENT TEMPERATURE (°C)
Figure 8. Reference Short Circuit Current
versus Temperature
125
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6
6 Page MC34065−H, L
1
5
External
Sync
Input
220p 1
F
3
RT CT 2
4
5
R
Bias
R
20k
Osc
.
+
− EA1
2R
1.0V R
The external diode clamp is required if the negative Sync current
is greater than −5.0 mA.
Figure 17. External Clock Synchronization
8
6 5.0k
+
−
5
5.0k
2
+
−
5.0k
1
4
R
Q
S
MC1455
RA
7
3
RB
C 1.08
f=
(RA + RB)C
RB
Dmax Drive Output 1 = RA + RB
Vref
15
R
Bias
R
1 20k
3
Osc.
2
4+
−
5 EA1
2R
1.0V
To additional MC34065s
RA
Dmax Drive Output 2 = RA + RB
Figure 18. External Duty Cycle Clamp and
Multi−Unit Synchronization
R
PIN FUNCTION DESCRIPTION
Pin Function
1 Sync Input
Description
A narrow rectangular waveform applied to this input will synchronize the oscillator. A dc voltage
within the range of 2.4 V to 5.5 V will inhibit the oscillator.
2 CT
Timing capacitor CT connects from this pin to ground setting the free−running oscillator frequency
range.
3 RT
Resistor RT connects from this pin to ground precisely setting the charge current for CT. RT must
be between 4.0 k and 16 k.
4 Voltage Feedback 1 This pin is the inverting input of Error Amplifier 1. It is normally connected to the switching power
supply output through a resistor divider.
5 Compensation 1
This pin is the output of Error Amplifier 1 and is made available for loop compensation.
6 Current Sense 1
A voltage proportional to the inductor current is connected to this input. PWM 1 uses this
information to terminate conduction of output switch Q1.
7 Drive Output 1
This pin directly drives the gate of a power MOSFET Q1. Peak currents up to 400 mA are sourced
and sunk by this pin.
8 Gnd
This pin is the control circuitry ground return and is connected back to the source ground.
9 Drive Gnd
This pin is a separate power ground return that is connected back to the power source. It is used
to reduce the effects of switching transient noise on the control circuitry.
10 Drive Output 2
This pin directly drives the gate of a power MOSFET Q2. Peak currents up to 400 mA are sourced
and sunk by this pin.
11 Current Sense 2
A voltage proportional to inductor current is connected to this input. PWM 2 uses this information
to terminate conduction of output switch Q2.
12 Compensation 2
This pin is the output of Error Amplifier 2 and is made available for loop compensation.
13 Voltage Feedback 2
This pin is the inverting input of Error Amplifier 2. It is normally connected to the switching power
supply output through a resistor divider.
14 Drive Output 2 Enable A logic low at this input disables Drive Output 2.
15 Vref
16 VCC
This is the 5.0 V reference output. It can provide bias for any additional system circuitry.
This pin is the positive supply of the control IC. The minimum operating voltage range after startup
is 11 V to 15.5 V for the −H suffix, 8.2 V to 9.5 V for the −L suffix.
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12
12 Page | ||
Seiten | Gesamt 18 Seiten | |
PDF Download | [ MC33065-H Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
MC33065-H | (MC3x065-x) High Performance Dual Channel Current Mode Controllers | ON Semiconductor |
MC33065-H | High Performance Dual Channel Current Mode Controllers | Motorola Semiconductors |
MC33065-L | (MC3x065-x) High Performance Dual Channel Current Mode Controllers | ON Semiconductor |
MC33065-L | High Performance Dual Channel Current Mode Controllers | Motorola Semiconductors |
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