MC34067 Datasheet, PDF (1/16 Pages) ON Semiconductor – HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS

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.
• 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
Order this document by MC34067/D
MC34067
MC33067
HIGH PERFORMANCE
ZERO VOLTAGE SWITCH
RESONANT MODE
CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
16
1
Simplified Block Diagram
15
V_CC
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
V_CC UVLO /
Enable
Variable
Frequency
Oscillator
One–Shot
2.5 V
Clamp
Error
Amp
5.0 V
Reference
V_ref UVLO
Steering
Flip–Flop
Soft–Start
Fault Detector /
Latch
4 Ground
MOTOROLA ANALOG IC DEVICE DATA
5
V_ref
14
Output A
12
Output B
13
Pwr Gnd
10
Fault Input
PIN CONNECTIONS
Osc Charge 1
16 One–Shot RC
Osc RC 2
Osc Control Current 3
15 VCC
14 Drive Output A
Gnd 4
Vref ₅
Error Amp Out 6
Inverting Input 7
Noninverting Input 8
13 Power Gnd
12 ^{Drive Output B}
11 CSoft–Start
10 Fault Input
9
Enable/UVLO
Adjust
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
MC34067DW
MC34067P
MC33067DW
MC33067P
TA = 0 to + 70°C
TA = – 40° to + 85°C
Package
SO–16L
Plastic DIP
SO–16L
Plastic DIP
© Motorola, Inc. 1996
Rev 0
1