MC34066 Datasheet, PDF (1/12 Pages) ON Semiconductor – High Performance High Performance

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High Performance
Resonant Mode Controllers
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.
• Variable 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
MC34066
MC33066
HIGH PERFORMANCE
RESONANT MODE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
PIN CONNECTIONS
Simplified Block Diagram
VCC
15
Enable/
UVLO Adjust ₉
VCC UVLO
Reference
Regulator
Osc
Deadtime ₁
Osc RC
Osc Control ²
Current 3
One–Shot RC
16
Variable
Frequency
Oscillator
One–Shot
Vref UVLO
Aout
Steering
Flip–Flop
Bout
Error Amp
Clamp
Error Amp
Out 6 ^Error
Amplifier
Error Amp +
8
Error Amp –
7
CSoft–Start
11
Soft–Start
Fault–Detector/
Latch
MOTOROLA ANALOG IC DEVICE DATA
5 ^Vref
Gnd
4
Drive
14 ^{Output A}
Drive
12 ^{Output B}
Drive Gnd
13
Fault Input
10
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
Operating
Temperature Range Package
MC34066DW
TA = 0° to +70°C
MC34066P
SO–16L
Plastic DIP
MC33066DW
TA = – 40° to +85°C
MC33066P
SO–16L
Plastic DIP
© Motorola, Inc. 1996
Rev 1
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