MC34066 Datasheet, PDF (1/11 Pages) ON Semiconductor – High Performance High Performance

MC34066, MC33066
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
V_CC
15
Enable/
UVLO Adjust ₉
V_CC UVLO
Reference
Regulator
Osc
Deadtime ₁
Osc RC
Osc Control ²
Current 3
One−Shot RC
16
Variable
Frequency
Oscillator
One−Shot
V_ref UVLO
A_out
Steering
Flip−Flop
B_out
Error Amp
Clamp
Error Amp
Out 6 ^Error
Amplifier
Error Amp +
8
Error Amp −
7
C_{Soft−Start}
11
Soft−Start
Fault−Detector/
Latch
5 ^Vref
Gnd
4
Drive
14 ^{Output A}
Drive
12 ^{Output B}
Drive Gnd
13
Fault Input
10
16
1
16
http://onsemi.com
MARKING
DIAGRAMS
16
PDIP−16
P SUFFIX
CASE 648
MC3x066P
AWLYYWW
1
16
SO−16W
DW SUFFIX
CASE 751G
MC33066DW
AWLYYWW
1
1
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
V_ref 5
Error Amp Out 6
Error Amp ₇
Inverting Input
Error Amp 8
Noninverting Input
(Top View)
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
9
Enable/UVLO
Adjust
ORDERING INFORMATION
Device
Package
Shipping
MC34066P
PDIP−16
25 Units/Rail
MC33066DW
SO−16W
47 Units/Rail
MC33066P
PDIP−16
25 Units/Rail
Figure 1. Simplified Block Diagram
© Semiconductor Components Industries, LLC, 2006
1
July, 2006 − Rev. 3
Publication Order Number:
MC34066/D