Motorola MC34066DW, MC34066P, MC33066DW, MC33066P Datasheet

  
  

The MC34066/MC33066 are high performance resonant mode
controllers designed for off–line and dc–to–dc converter applications that
utilize frequency modulated constant on–time or constant off–time control.
These integrated circuits feature a variable frequency oscillator with
programmable deadtime, precision retriggerable one–shot timer,
temperature compensated reference, high gain wide–bandwidth error
amplifier with a precision output clamp, 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.

• V ariable Frequency Oscillator with a Control Range Exceeding 1000:1

• Programmable Oscillator Deadtime Allows Constant Off–Time Operation

• Precision Retriggerable One–Shot 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 Soft–Start Circuitry

• Low Startup Current for Off–Line Operation

Order this document by MC34066/D




HIGH PERFORMANCE

RESONANT MODE

CONTROLLERS

SEMICONDUCTOR

TECHNICAL DATA

P SUFFIX

PLASTIC PACKAGE

CASE 648

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SO–16L)

PIN CONNECTIONS

V

CC

Enable/

UVLO Adjust

Osc

Deadtime

Osc RC

Osc Control

Current

One–Shot RC

Error Amp

Out

Error Amp +
Error Amp –

C

Soft–Start

15

9

1
2
3

16

6

8
7

11

VCC UVLO

Error Amp

Error

Amplifier

Simplified Block Diagram

Reference

Regulator

V

UVLO

Variable

Frequency

Oscillator

One–Shot

Clamp

Soft–Start

ref

Steering

Flip–Flop

Fault–Detector/

Latch

Osc Deadtime

Osc RC

Osc Control

Error Amp Out

V

ref

5

Gnd

4

A

out

B

out

Drive
Output A

14

Drive
Output B

12

Drive Gnd

13

Fault Input

10

Error Amp

Inverting Input

Error Amp

Noninverting Input

Device

MC34066DW
MC34066P
MC33066DW
MC33066P

1
2
3

Current

4

Gnd

5

V

ref

6
7
89

(Top View)

ORDERING INFORMATION

Operating

Temperature Range

TA = 0° to +70°C

TA = –40° to +85°C

16

One–Shot RC

15

V

CC

14

Drive Output A

13

Drive Gnd

12

Drive Output B

11

C

Soft–Start

10

Fault Input
Enable/UVLO

Adjust

Package

SO–16L

Plastic DIP

SO–16L

Plastic DIP

MOTOROLA ANALOG IC DEVICE DATA

 Motorola, Inc. 1996 Rev 1

1

MC34066 MC33066

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Input Supply Voltage V
Drive Output Current, Source or Sink (Note 1)

Continuous
Pulsed (0.5 µs, 25% Duty Cycle)

Error Amplifier, Fault, One–Shot, Oscillator, and

Soft–Start Inputs
UVLO Adjust Input V
Soft–Start Discharge Current I
Power Dissipation and Thermal Characteristics

DW Suffix Package, Case 751G

Maximum Power Dissipation @ TA = 25°C
Thermal Resistance, Junction–to–Air

P Suffix Package, Case 648

Maximum Power Dissipation @ TA = 25°C

Thermal Resistance, Junction–to–Air
Operating Junction Temperature T
Operating Ambient Temperature

MC34066
MC33066

Storage Temperature Range T

CC

I

O

V

in

in(UVLO)

dchg

P

D

R

θJA

P

D

R

θJA

J

T

A

stg

20 V

0.3

1.5

–1.0 to +6.0 V

–1.0 to V

CC

20 mA

862
145

1.25
100

mW

°C/W

W

°C/W

+150 °C

°C

0 to +70

–40 to +85

–65 to +150 °C

A

V

ELECTRICAL CHARACTERISTICS (V

= 12 V [Note 2], R

CC

= 95.3 k, RDT = 0 Ω, R

OSC

= 5.62 k, C

VFO

= 300 pF, RT = 14.3 k,

OSC

CT = 300 pF, CL = 1.0 nF, for typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that applies
[Note 3], unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

REFERENCE SECTION

Reference Output Voltage (IO = 0 mA, TA = 25°C) V
Line Regulation (VCC = 10 V to 18 V) Reg
Load Regulation (IO = 0 mA to 10 mA) Reg
Total Output Variation over Line, Load, and Temperature V
Output Short Circuit Current I
Reference Undervoltage Lockout Threshold V

ref

line

load
ref
O

th

5.0 5.1 5.2 V
– 1.0 20 mV
– 1.0 20 mV

4.9 – 5.3 mV

25 100 190 mA

3.8 4.3 4.8 V

ERROR AMPLIFIER

Input Offset Voltage (VCM = 1.5 V) V
Input Bias Current (VCM = 1.5 V) I
Input Offset Current (VCM = 1.5 V) I
Open Loop Voltage Gain (VCM = 1.5 V, VO = 2.0 V) A

IO
IB

IO

VOL

– 1.0 10 mV
– 0.2 1.0 µA
– 0 0.5 µA

70 100 – dB
Gain Bandwidth Product (f = 100 kHz) GBW 2.5 4.2 – MHz
Input Common Mode Rejection Ratio (VCM = 1.5 V to 5.0 V) CMRR 70 95 – dB
Power Supply Rejection Ratio (VCC = 10 V to 18 V, f = 120 Hz) PSRR 80 100 – dB
Output Voltage Swing

High State with Respect to Pin 3 (I
Low State with Respect to Ground (I

NOTES: 1. Maximum package power dissipation limits must be observed.

2.Adjust VCC above the Startup threshold before setting to 12 V.

3.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T

=0°C for MC34066 T

low

–40°C for MC33066 T

= 2.0 mA)

Source

= 1.0 mA)

Sink

= +70°C for MC34066

high

= +85°C for MC33066

high

V

OH

V

OL

2.3
–

2.7

0.4

3.1

0.6

V

2

MOTOROLA ANALOG IC DEVICE DATA

MC34066 MC33066

ELECTRICAL CHARACTERISTICS (continued) (V

= 12 V [Note 2], R

CC

= 95.3 k, RDT = 0 Ω, R

OSC

VFO

= 5.62 k, C

OSC

= 300 pF,
RT = 14.3 k, CT = 300 pF, CL = 1.0 nF, for typical values TA = 25°C, for min/max values TA is the operating ambient temperature range that
applies [Note 3], unless otherwise noted.)

Characteristics

Symbol Min Typ Max Unit

OSCILLAT OR

Frequency (Error Amp Output Low)

TA = 25°C
Total Variation (VCC = 10 V to 18 V, TA = T

Frequency (Error Amp Output High)

TA = 25°C
Total Variation (VCC = 10 V to 18 V, TA = T

Oscillator Control Input Voltage, Pin 3 (I

Sink

Output Deadtime (Error Amp Output High)

RDT = 0 Ω
RDT = 1.0 k

Low

Low

to T

to T

High

High

)

)

= 0.5 mA, TA = 25°C) V

f

OSC(low)

f

OSC(high)

in

DT

90
85

900
850

100

–

110
115

1000–1100

1150

1.3 1.4 1.5 V

–

600

70

700

100
800

kHz

kHz

ns

ONE–SHOT

Drive Output On–Time (RDT = 1.0 k)

TA = 25°C
Total Variation (VCC = 10 V to 18 V, TA = T

Low

to T

High

)

t

OS

1.43

1.4

1.5

1.57

µs

–

1.6

DRIVE OUTPUTS

Output Voltage

Low State (I

Low State (I

High State (I

High State (I

Output Voltage with UVLO Activated (VCC = 6.0 V, I

= 20 mA)

Sink

= 200 mA)

Sink
Source
Source

= 20 mA)
= 200 mA)

= 1.0 mA) V

Sink

V

OL(UVLO)

Output Voltage Rise T ime (CL = 1.0 nF) t
Output Voltage Fall T ime (CL = 1.0 nF) t

V

OL

OH

–
–

9.5

9.0

0.8

1.5

10.3

9.8

1.2

2.0
–
–

– 0.8 1.2 V

r
f

– 20 50 ns
– 20 50 ns

V

FAULT COMPARATOR

Input Threshold V
Input Bias Current (V
Propagation Delay to Drive Outputs (100 mV Overdrive) t

= 0 V) I

Pin 10

PLH(In/Out)

th

IB

0.95 1.0 1.05 V
– –2.0 –10 µA
– 60 100 ns

SOFT–START

Capacitor Charge Current (V
Capacitor Discharge Current (V

= 2.5 V) I

Pin 11

= 2.5 V) I

Pin 11

chg

Idchg

4.5 8.1 14 µA

1.0 8.0 – mA

UNDERVOLTAGE LOCKOUT

Startup Threshold, VCC Increasing

Enable/UVLO Adjust Pin Open
Enable/UVLO Adjust Pin Connected to V

CC

Minimum Operating Voltage after Turn–On

Enable/UVLO Adjust Pin Open
Enable/UVLO Adjust Pin Connected to V

CC

Enable/UVLO Adjust Shutdown Threshold Voltage V
Enable/UVLO Adjust Input Current (Pin 9 = 0V) I

V

th(UVLO)

V

CC(min)

th(Enable)

in(Enable)

14.8

8.0

8.0

7.6

16

9.0

9.0

8.6

17.2
10

10

9.6

6.0 7.0 – V
– –0.2 –1.0 mA

V

V

TOTAL DEVICE

Power Supply Current (Enable/UVLO Adjust Pin Open)

Startup (VCC = 13.5 V)
Operating (f

NOTES: 2. Adjust VCC above the Startup threshold before setting to 12 V.

3.Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T

low

= 100 kHz) (Note 2)

OSC

=0°C for MC34066 T

–40°C for MC33066 T

= +70°C for MC34066

high

= +85°C for MC33066

high

I

CC

0.45

–

21

0.6
30

–

mA

MOTOROLA ANALOG IC DEVICE DATA

3

V

CC

Enable/

UVLO Adjust

Osc Deadtime

R

DT

R

OSC

C

T

Error Amp

Inverting Input

Noninverting Input

C

Soft–Start

Osc RC

C

OSC

One–Shot RC

R

T

Osc Control

Current

I

OSC

Output
Error Amp

Error Amp

R

15

9

1

2

16

3

VFO

6
7

8

11

Figure 1. MC34066 Representative Block Diagram

50k

7k

I

OSC

+
–

2.5V EA Clamp

–
+

Error

Amplifier

7k

+

50k

–

8V

Q1

Current Mirror

Error Amp

Output Clamp

Soft–Start

Buffer

VCC UVLO

V

CC

Q2

Oscillator

–
+

4.9V/3.6V
One–Shot

–
+

4.9V/3.6V

µ

A

9

MC34066 MC33066

Reference

Regulator

5.1V

UVLO + Fault

5.1V

V

UVLO

UVLO

ref

–

+

t

on

4.2V/4V

Steering

Flip–Flop

Q

T

Q

R

R

Q

S

Fault

Latch

Drivers

Fault

Comparator

Fault

+
–

1.0V

5

4

14

12

13

10

V

ref

Gnd

Drive
Output A

Drive
Output B

Drive
Gnd

Fault
Input

OPERA TING 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
square–wave control. When compared to square–wave
converters, resonant mode control offers several benefits
including lower switching losses, higher efficiency , lower EMI
emission, and smaller size. This integrated circuit has been
developed to support new trends in power supply design.
The MC34066 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, performance and
flexibility for a wide variety of resonant mode power supply
applications.

The primary purpose of the control chip is to supply
precise pulses to the gates of external power MOSFETs at a
repetition rate regulated by a feedback control loop. The
MC34066 can be operated in any of three modes as follows:

1) fixed on–time, variable frequency; 2) fixed off–time,
variable frequency; and 3) combinations of 1 and 2 that
change from fixed on–time to fixed off–time as the frequency
increases. 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 first
page of this data sheet, which identifies the main functional
blocks and the block–to–block interconnects. Figure 1 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 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.

4

MOTOROLA ANALOG IC DEVICE DATA