Order this document by MC34065/D
High Performance
Dual Channel Current
Mode Controller
The MC34065 is a high performance, fixed frequency, dual current mode
controllers. It is specifically designed for off–line and dc–to–dc converter
applications offering the designer a cost effective solution with minimal
external components. This integrated circuit feature a unique oscillator for
precise duty cycle limit and frequency control, a temperature compensated
reference, two high gain error amplifiers, two current sensing comparators,
Drive Output 2 Enable pin, and two high current totem pole outputs ideally
suited for driving power MOSFETs.
Also included are protective features consisting of input and reference
undervoltage lockouts each with hysteresis, cycle–by–cycle current limiting,
and a latch for single pulse metering of each output.
The MC34065 and MC33065 are available in dual–in–line and surface
mount packages.
•
Unique Oscillator for Precise Duty Cycle Limit and Frequency Control
MC34065
MC33065
HIGH PERFORMANCE
DUAL CHANNEL CURRENT
MODE CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
•
•
•
•
•
•
•
•
Current Mode Operation to 500 kHz
Automatic Feed Forward Compensation
Separate Latching PWMs for Cycle–By–Cycle Current Limiting
Internally Trimmed Reference with Undervoltage Lockout
Drive Output 2 Enable Pin
Two High Current Totem Pole Outputs
Input Undervoltage Lockout with Hysteresis
Low Startup and Operating Current
PIN CONNECTIONS
Representative Block Diagram
VCC
Vref
5.0 V
Reference
Vref
Undervoltage
Lockout
Oscillator
2
+
–
Error
Amp 1
Latching
PWM 1
Drive
7 Output 1
VCC
Undervoltage
Lockout
16
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SO–16L)
16
1
Sync Input 1
CT 2
RT 3
Voltage Feedback 1 4
Compensation 1 5
Current Sense 1 6
Drive Output 1 7
Gnd 8
Current
6 Sense 1
Drive
10 Output 2
16 VCC
15 Vref
14 Drive Output 2
Enable
13 Voltage Feedback 2
12 Compensation 2
11 Current Sense 2
10 Drive Output 2
9 Drive Gnd
(Top View)
15
R
R
1
Sync Input
RT
CT
Voltage
Feedback 1
Compensation 1
5
Drive Output 2
Enable 14
Voltage
Feedback 2 13
Compensation 2
12
+
–
Error
Amp 2
3
4
Latching
PWM 2
Current
11 Sense 2
Gnd
8
Drive Gnd 9
ORDERING INFORMATION
Device
MC34065DW
MC34065P
MC33065DW
MC33065P
©
Motorola, Inc. 1996
Operating
Temperature Range
TA = 0° to +70°C
TA = –40° to +85°C
Package
SO–16L
Plastic DIP
SO–16L
Plastic DIP
Rev 1
This device contains 208 active transistors.
MOTOROLA ANALOG IC DEVICE DATA
1
ONSEMI [ ON SEMICONDUCTOR ]
