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PDF ( 数据手册 , 数据表 ) MC33067

零件编号 MC33067
描述 (MC33067 / MC34067) High Performance Resonant Mode Controllers
制造商 ON Semiconductor
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MC33067 数据手册, 描述, 功能
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







MC33067 pdf, 数据表
MC34067, MC33067, NCV33067
OPERATING DESCRIPTION
Introduction
As power supply designers have strived to increase power
conversion efficiency and reduce passive component size,
high frequency resonant mode power converters have
emerged as attractive alternatives to conventional
pulse−width modulated control. When compared to
pulse−width modulated converters, resonant mode control
offers several benefits including lower switching losses,
higher efficiency, lower 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 1.0 MHz. This integrated circuit provides the
features and performance specifically for zero voltage
switching resonant mode power supply applications.
The primary purpose of the control chip is to provide a
fixed off−time to the gates of external power MOSFETs at
a repetition rate regulated by a feedback control loop.
Additional features of the IC ensure that system startup and
fault conditions are administered in a safe, controlled manner.
A simplified block diagram of the IC is shown on the front
page, which identifies the main functional blocks and the
block−to−block interconnects. Figure 14 is a detailed
functional diagram which accurately represents the internal
circuitry. The various functions can be divided into two
sections. The first section includes the primary control path
which produces precise output pulses at the desired
frequency. Included in this section are a variable frequency
Oscillator, a One−Shot, a pulse Steering Flip−Flop, a pair of
power MOSFET Drivers, and a wide bandwidth Error
Amplifier. The second section provides several peripheral
support functions including a voltage reference,
undervoltage lockout, soft−start circuit, and a fault detector.
Primary Control Path
The output pulse width and repetition rate are regulated
through the interaction of the variable frequency Oscillator,
One−Shot timer and Error Amplifier. The Oscillator triggers
the One−Shot which generates a pulse that is alternately
steered to a pair of totem pole output drivers by a toggle
Flip−Flop. The Error Amplifier monitors the output of the
regulator and modulates the frequency of the Oscillator.
High speed Schottky logic is used throughout the primary
control channel to minimize delays and enhance high
frequency characteristics.
Oscillator
The characteristics of the variable frequency Oscillator
are crucial for precise controller performance at high
operating frequencies. In addition to triggering the
One−Shot timer and initiating the output deadtime, the
oscillator also determines the initial voltage for the one−shot
capacitor. The Oscillator is designed to operate at
frequencies exceeding 1.0 MHz. The Error Amplifier can
control the oscillator frequency over a 1000:1 frequency
range, and both the minimum and maximum frequencies are
easily and accurately programmed by the proper selection of
external components.
The functional diagram of the Oscillator and One−Shot
timer is shown in Figure 16. The oscillator capacitor (COSC)
is initially charged by transistor Q1. When COSC exceeds the
4.9 V upper threshold of the oscillator comparator, the base
of Q1 is pulled low allowing COSC to discharge through the
external resistor, (ROSC), and the oscillator control current,
(IOSC). When the voltage on COSC falls below the 3.6 V
lower threshold of the comparator, Q1 turns on and again
charges COSC.
COSC charges from 3.6 V to 5.1 V in less than 50 ns. The
high slew rate of COSC and the propagation delay of the
comparator make it difficult to control the peak voltage. This
accuracy issue is overcome by clamping the base of Q1
through a diode to a voltage reference. The peak voltage of
the oscillator waveform is thereby precisely set at 5.1 V.
ROSC
COSC
OSC Charge
1
OSC RC
2
CT RT
One-Shot RC
Oscillator 10
Control Current
IOSC
3
RVFO
6
Error Amp Output
VCC
Q1
VCC
Vref
D1
Oscillator
IOSC 4.9 V/3.6 V
One-Shot
3.1 V
Error Amp
Clamp
4.9V/3.6V
Figure 16. Oscillator and One−Shot Timer
The frequency of the Oscillator is modulated by varying
the current flowing out of the Oscillator Control Current
(IOSC) pin. The IOSC pin is the output of a voltage regulator.
The input of the voltage regulator is tied to the variable
frequency oscillator. The discharge current of the Oscillator
increases by increasing the current out of the IOSC pin.
Resistor RVFO is used in conjunction with the Error Amp
output to change the IOSC current. Maximum frequency
occurs when the Error Amplifier output is at its low state
with a saturation voltage of 0.1 V at 1.0 mA.
The minimum oscillator frequency will result when the
IOSC current is zero, and COSC is discharged through the
external resistor (ROSC). This occurs when the Error
Amplifier output is at its high state of 2.5 V. The minimum
and maximum oscillator frequencies are programmed by the
proper selection of resistor ROSC and RVFO.
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8







MC33067 equivalent, schematic
MC34067, MC33067, NCV33067
PACKAGE DIMENSIONS
SOIC−16W
DW SUFFIX
CASE 751G−03
ISSUE D
DA
16 9
q
18
16X B
0.25 M T A S B S
B
14X e
SEATING
PLANE
T
C
SOLDERING FOOTPRINT
16X 0.58
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INLCUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 TOTAL IN
EXCESS OF THE B DIMENSION AT MAXIMUM
MATERIAL CONDITION.
MILLIMETERS
DIM MIN MAX
A 2.35 2.65
A1 0.10 0.25
B 0.35 0.49
C 0.23 0.32
D 10.15 10.45
E 7.40 7.60
e 1.27 BSC
H 10.05 10.55
h 0.25 0.75
L 0.50 0.90
q 0_ 7_
1
16X
1.62
11.00
1.27
PITCH
DIMENSIONS: MILLIMETERS
ON Semiconductor and the are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries.
SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed
at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation
or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets
and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended,
or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which
the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or
unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable
copyright laws and is not for resale in any manner.
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16
MC34067/D










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