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MC34067 Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer MC34067
Beschreibung (MC33067 / MC34067) High Performance Resonant Mode Controllers
Hersteller ON Semiconductor
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Gesamt 16 Seiten
MC34067 Datasheet, Funktion
MC34067, MC33067,
NCV33067
High Performance
Resonant Mode Controllers
The MC34067/MC33067 are high performance zero voltage switch
resonant mode controllers designed for off−line and dc−to−dc
converter applications that utilize frequency modulated constant
off−time or constant deadtime control. These integrated circuits
feature a variable frequency oscillator, a precise retriggerable
one−shot timer, temperature compensated reference, high gain wide
bandwidth error amplifier, steering flip−flop, and dual high current
totem pole outputs ideally suited for driving power MOSFETs.
Also included are protective features consisting of a high speed fault
comparator and latch, programmable soft−start circuitry, input
undervoltage lockout with selectable thresholds, and reference
undervoltage lockout. These devices are available in dual−in−line and
surface mount packages.
Features
Zero Voltage Switch Resonant Mode Operation
Variable Frequency Oscillator with a Control Range
Exceeding 1000:1
Precision One−Shot Timer for Controlled Off−Time
Internally Trimmed Bandgap Reference
4.0 MHz Error Amplifier
Dual High Current Totem Pole Outputs
Selectable Undervoltage Lockout Thresholds with Hysteresis
Enable Input
Programmable Soft−Start Circuitry
Low Startup Current for Off−Line Operation
NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
15
VCC
Enable / 9
UVLO Adjust
1
OSC Charge
2
OSC RC
Oscillator 3
Control Current
16
One-Shot
Error Amp 6
Output
Noninverting 8
Input
Inverting Input 7
11
Soft-Start
VCC UVLO /
Enable
Variable
Frequency
Oscillator
One-Shot
2.5 V
Clamp
Error
Amp
5.0 V
Reference
Vref UVLO
Steering
Flip-Flop
Soft-Start
Fault Detector/
Latch
5
Vref
14
Output A
12
Output B
13
Pwr GND
10
Fault Input
4 Ground
Figure 1. Simplified Block Diagram
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MARKING
DIAGRAMS
16
1
PDIP−16
P SUFFIX
CASE 648
16
1
MC3x067P
AWLYYWWG
16
1
SOIC−16W
DW SUFFIX
CASE 751G
16
MC3x067DW
AWLYYWWG
1
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
OSC Charge 1
16 One-Shot RC
OSC RC 2
15 VCC
OSC Control Current 3
14 Drive Output A
GND 4
13 Power GND
Vref 5
12 Drive Output B
Error Amp Out 6
11 CSoft-Start
Inverting Input 7
Noninverting Input 8
10 Fault Input
9
Enable/UVLO
Adjust
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
August, 2015 − Rev. 15
1
Publication Order Number:
MC34067/D






MC34067 Datasheet, Funktion
MC34067, MC33067, NCV33067
0
TA = - 40°C
-10
TA = - 20°C
- 20
TA = -125°C
- 30
- 40 VCC = 12 V
- 50
0
20 40 60 80
Iref, REFERENCE SOURCE CURRENT (mA)
100
Figure 8. Reference Output Voltage Change
versus Source Current
0
-1.0
VCC
Source Saturation
(Load to Ground)
VCC = 12 V
80 ms Pulsed Load
- 2.0 TA = 25°C
120 Hz Rate
- 3.0 TA = - 40°C
3.0
2.0
1.0
0
0
TA = - 40°C
TA = 25°C
Source Saturation
(Load to VCC)
GND
0.2 0.4 0.6 0.8
IO, OUTPUT LOAD CURRENT (A)
1.0
Figure 9. Drive Output Saturation Voltage
versus Load Current
CL = 1.0 nF
90% TA = 25 °C
10%
20 ns/DIV
Figure 10. Drive Output Waveform
3.2
2.4
1.6
0.8 VCC = 12 V
Pin 10 = Vref
TA = 25 °C
0
0 2.0 4.0 6.0 8.0 10
Idchg, CAPACITOR DISCHARGE CURRENT (mA)
Figure 11. Soft−Start Saturation Voltage
versus Capacitor Discharge Current
2000
1600
1200
800
400
0
30
VCC = 12 V
CL = 1.0 nF
TA = 25 °C
40 50 60 70 80
ICC, SUPPLY CURRENT (mA)
Figure 12. Operating Frequency
versus Supply Current
90
24
TA = 25 °C
20
16
12
Enable/UVLO
Adjust Pin
Open
(Solid Line)
8.0 Enable/UVLO
Adjust Pin
4.0 to VCC
(Dashed Line)
0 0 4.0 8.0 12 16 20
VCC, SUPPLY VOLTAGE (V)
Figure 13. Supply Current versus Supply Voltage
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MC34067 pdf, datenblatt
MC34067, MC33067, NCV33067
The maximum duty cycle is controlled by the leakage
inductance, not by the MC34067. The One−Shot in the
MC34067 only assures that the power switch is turned on
under a zero voltage condition. Adjust the one−shot period
COSC
One-Shot
5.1 V
3.6 V
5.1 V
3.6 V
so that the output switch is activated while the primary
current is slewing but before the current changes polarity.
The resonant stage should then be designed to be as long as
the time for the primary current to go to 0 A.
Drive Output A
Drive Output B
Vin
Input Voltage 1/2 Vin
0V
+ Iprimary
Primary Current 0 A
- Iprimary
Vin/Turns Ratio
Output Rectifier Voltage
Figure 21. Application Timing Diagram
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