MC34067_09 Datasheet, PDF (1/16 Pages) ON Semiconductor – High Performance Resonant Mode Controllers

MC34067, MC33067
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
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
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
5
V_ref
14
Output A
12
Output B
13
Pwr GND
10
Fault Input
4 Ground
Figure 1. Simplified Block Diagram
http://onsemi.com
MARKING
DIAGRAMS
16
16
1
PDIP−16
1
P SUFFIX
CASE 648
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 V_CC
OSC Control Current ³
14 Drive Output A
GND 4
13 Power GND
V_{ref 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)
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
1
December, 2009 − Rev. 13
Publication Order Number:
MC34067/D