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PDF MC34066 Data sheet ( Hoja de datos )

Número de pieza MC34066
Descripción (MC33066 / MC34066) High Performance High Performance
Fabricantes ON Semiconductor 
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MC34066, MC33066
High Performance
Resonant Mode Controllers
The MC34066/MC33066 are high performance resonant mode
controllers designed for offline and dctodc converter applications
that utilize frequency modulated constant ontime or constant
offtime control. These integrated circuits feature a variable
frequency oscillator with programmable deadtime, precision
retriggerable oneshot timer, temperature compensated reference,
high gain widebandwidth error amplifier with a precision output
clamp, steering flipflop, 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 softstart circuitry, input
undervoltage lockout with selectable thresholds, and reference
undervoltage lockout.
These devices are available in dualinline and surface mount
packages.
Variable Frequency Oscillator with a Control Range Exceeding
1000:1
Programmable Oscillator Deadtime Allows Constant OffTime
Operation
Precision Retriggerable OneShot Timer
Internally Trimmed Bandgap Reference
5.0 MHz Error Amplifier with Precision Output Clamp
Dual High Current Totem Pole Outputs
Selectable Undervoltage Lockout Thresholds with Hysteresis
Enable Input
Programmable SoftStart Circuitry
Low Startup Current for OffLine Operation
VCC
15
Enable/
UVLO Adjust 9
Osc
Deadtime 1
Osc RC
Osc Control 2
Current 3
One−Shot RC
16
VCC UVLO
Reference
Regulator
Variable
Frequency
Oscillator
One−Shot
Vref UVLO
Steering
Flip−Flop
Aout
Bout
Error Amp
Clamp
Error Amp
Out 6 Error
Amplifier
Error Amp +
8
Error Amp −
7
CSoft−Start
11
Soft−Start
Fault−Detector/
Latch
Figure 1. Simplified Block Diagram
5 Vref
Gnd
4
Drive
14 Output A
Drive
12 Output B
Drive Gnd
13
Fault Input
10
16
1
16
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MARKING
DIAGRAMS
16
PDIP16
P SUFFIX
CASE 648
MC3x066P
AWLYYWW
1
16
SO16W
DW SUFFIX
CASE 751G
MC33066DW
AWLYYWW
11
x = 3 or 4
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
PIN CONNECTIONS
Osc Deadtime 1
Osc RC 2
Osc Control 3
Current
Gnd 4
Vref 5
Error Amp Out 6
Error Amp 7
Inverting Input
Error Amp 8
Noninverting Input
(Top View)
16 One−Shot RC
15 VCC
14 Drive Output A
13 Drive Gnd
12 Drive Output B
11 CSoft−Start
10 Fault Input
9
Enable/UVLO
Adjust
ORDERING INFORMATION
Device
Package
Shipping
MC34066P
PDIP16
25 Units/Rail
MC33066DW
SO16W
47 Units/Rail
MC33066P
PDIP16
25 Units/Rail
© Semiconductor Components Industries, LLC, 2006
July, 2006 Rev. 3
1
Publication Order Number:
MC34066/D

1 page




MC34066 pdf
MC34066, MC33066
Primary Control Path
The output pulse width and repetition rate are regulated
through the interaction of the variable frequency Oscillator,
OneShot timer and Error Amplifier. The Oscillator triggers
the OneShot which generates a pulse that is alternately
steered to a pair of totempole output drivers by a toggle
FlipFlop. The Error Amplifier monitors the output of the
regulator and modulates the frequency of the Oscillator.
Highspeed 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
OneShot timer and initiating the output pulse, the
Oscillator also determines the initial voltage for the
OneShot capacitor and defines the minimum deadtime
between output pulses. 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 Oscillator also includes an
adjustable deadtime feature for applications requiring
additional time between output pulses.
The functional diagram of the Oscillator and OneShot
timer is shown in Figure 3. The oscillator capacitor COSC is
initially charged by transistor Q1 through the optional
deadtime resistor RDT. 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
resistors and the internal Current Mirror. When the voltage
on COSC falls below the comparator’s 3.6 V lower threshold,
Q1 turns on and again charges COSC.
VCC
Osc Deadtime
Q1
ROSC
1
RDT
Osc RC
2
COSC
IOSC
Q2
5.1V
Oscillator
+
4.9V/3.6V
One−Shot RC
RT 16
CT Osc Control
Current
One−Shot
+
4.9V/3.6V
3
UVLO + Fault
IOSC RVFO
6
Current Mirror
Error Amp
Output
Figure 3. Oscillator and OneShot Timer
If RDT is 0 Ω, 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 diode Q2 to a voltage reference. The
peak voltage of the oscillator waveform is thereby precisely
set at 5.1 V.
The frequency of the Oscillator is modulated by varying
the current IOSC flowing through RVFO into the Osc Control
Current pin. The control current drives a unity gain Current
Mirror which pulls an identical current from the COSC
capacitor. As IOSC increases, COSC discharges faster thus
decreasing the Oscillator period and increasing the
frequency. The maximum frequency occurs when the Error
Amplifier output is at the upper clamp level, nominally
2.5 V above the voltage at the Osc Control Current pin. The
minimum discharge time for COSC, which corresponds to
the maximum oscillator frequency, is given by Equation 1.
tdchg(min) = (RDT + ROSC)COSCIn
2.5ROSC
RVFO
+ 5.1
2.5ROSC
RVFO
+ 3.6
(1)
The minimum oscillator frequency will result when the
IOSC current is zero, and COSC is discharged through the
external resistors ROSC and RDT. This occurs when the Error
Amplifier output voltage is less than the two diode drops
required to bias the input of the Current Mirror. The
maximum oscillator discharge time is given by Equation 2.
tdchg(max) = (RDT + ROSC) COSCIn
5.1
3.6
(2)
The outputs of the control IC are off whenever the
oscillator capacitor COSC is being charged by transistor Q1.
The minimum time between output pulses (deadtime) can be
programmed by controlling the charge time of COSC.
Resistor RDT reduces the current delivered by Q1 to COSC,
thus increasing the charge time and output deadtime.
Varying RDT from 0 Ω to 1000 Ω will increase the output
deadtime from 80 ns to 680 ns with COSC equal to 300 pF.
The general expression for the oscillator charge time is give
by Equation 3.
tchg(max) = RDT COSC In
5.13.6
5.14.9
+ 80 ns
(3)
The minimum and maximum oscillator frequencies are
programmed by the proper selection of resistor ROSC and
RVFO. After selecting RDT for the desired deadtime, the
minimum frequency is programmed by ROSC using
Equations 2 and 3 in Equation 4:
1
fOSC(min)
= tdchg(max) + tchg
(4)
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5

5 Page





MC34066 arduino
MC34066, MC33066
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 3036752175 or 8003443860 Toll Free USA/Canada
Fax: 3036752176 or 8003443867 Toll Free USA/Canada
N. American Technical Support: 8002829855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81357733850
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11
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
MC34066/D

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