MC34067 ON Semiconductor, MC34067 Datasheet
MC34067
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MC34067 Summary of contents
Page 1
... MC34067, MC33067 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− ...
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... MC34067DW MC34067DWG MC34067DWR2 MC34067DWR2G MC34067P MC34067PG †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. MC34067, MC33067 Rating Package SOIC−16W SOIC−16W (Pb−Free) SOIC−16W SOIC−16W (Pb− ...
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... CC 3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible 0°C for MC34067 low = − 40°C for MC33067 70°C for MC34067 high = + 85°C for MC33067 MC34067, MC33067 = 2940 2370 300 pF, R OSC ...
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... Startup Threshold voltage before setting Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible 0°C for MC34067 low = − 40°C for MC33067 70°C for MC34067 high = + 85°C for MC33067 MC34067, MC33067 ( [Note 6 OSC = 25° ...
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... Oscillator Control Current 50 40 Gain Phase 0 Phase Margin −10 = 64° − 100 k 1.0M f, FREQUENCY (Hz) Figure 6. Open Loop Voltage Gain and Phase versus Frequency MC34067, MC33067 3500 = 300 25°C 3000 A R OSC 2500 = 500 pF OSC 2000 1500 CC = ∞ ...
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... 1 1600 = 25 ° 1200 800 400 SUPPLY CURRENT (mA) CC Figure 12. Operating Frequency versus Supply Current MC34067, MC33067 − 40° −1 25°C A − 2 − 40°C − 3.0 A 3.0 2.0 1 100 0 0.2 Figure 9. Drive Output Saturation Voltage 3 ...
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... I R OSC VFO Error Amp Output 6 8 Noninverting Input Inverting Input 7 Error Amp Soft−Start 11 Figure 14. MC34067 Representative Block Diagram 5 OSC 5.1 V One−Shot 3.6 V Output A Output High State Error Amp output, minimum I occurring at minimum input voltage, maximum load. ...
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... EMI emission, and smaller size. A new integrated circuit has been developed to support this trend in power supply design. The MC34067 Resonant Mode Controller is a high performance bipolar IC dedicated to variable frequency power control at frequencies exceeding 1 ...
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... Flip−Flop and output drivers. The output pulse (t initiated by the Oscillator and terminated by the One−Shot comparator. With zero voltage resonant mode converters, the oscillator discharge time should never be set less than the one−shot period. MC34067, MC33067 using Error Amplifier OSC A fully accessible high performance Error Amplifier is provided for feedback control of the power supply system ...
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... Reference. Note that after activation, the Fault Latch will remain in a set state only as long MC34067. Also, Drive Output B will assume a high state if the Fault input signal drops below the 1.0 V threshold level even after the Fault Latch has been set. In some applications this characteristic could be problematic but it can be easily remedied by AC coupling Drive Output B ...
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... Buffer Soft−Start 11 6 Ground Figure 20. Fault Detector and Soft−Start The MC34067 is specifically designed for zero voltage switching (ZVS) quasi−resonant applications. The IC is optimized for double−ended push−pull or bridge type converters operating in continuous conduction mode. Operation of this type of ZVS with resonant properties is similar to standard push− ...
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... 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 5 OSC 3.6 V 5.1 V 3.6 V One−Shot Drive Output A Drive Output B ...
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... MC34067, MC33067 http://onsemi.com 13 ...
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... Figure 23. Printed Circuit Board and Component Layout MC34067, MC33067 (Top View) (Bottom View) 5.0″ http://onsemi.com 14 ...
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... B B 16X 0. SEATING e PLANE 14X T MC34067, MC33067 PACKAGE DIMENSIONS PDIP−16 P SUFFIX CASE 648−08 ISSUE T NOTES: 1. DIMENSIONING AND TOLERANCING PER 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION L TO CENTER OF LEADS 4. DIMENSION B DOES NOT INCLUDE 5. ROUNDED CORNERS OPTIONAL. L SEATING PLANE M J ...
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... P.O. Box 61312, Phoenix, Arizona 85082−1312 USA Phone: 480−829−7710 or 800−344−3860 Toll Free USA/Canada Fax: 480−829−7709 or 800−344−3867 Toll Free USA/Canada Email: orderlit@onsemi.com MC34067, MC33067 N. American Technical Support: 800−282−9855 Toll Free USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2− ...