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MC34065-H Datasheet, PDF (1/14 Pages) ON Semiconductor – HIGH PERFORMANCE DUAL CHANNEL CURRENT MODE CONTROLLERS | |||
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Order this document by MC34065âH/D
MC34065-H, L
High Performance
MC33065-H, L
Dual Channel Current
Mode Controllers
The MC34065âH,L series are high performance, fixed frequency, dual
current mode controllers. They are specifically designed for offâline and
dcâtoâdc converter applications offering the designer a cost effective
solution with minimal external components. These integrated circuits 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, cycleâbyâcycle current limiting,
and a latch for single pulse metering of each output. These devices are
available in dualâinâline and surface mount packages.
The MC34065âH has UVLO thresholds of 14 V (on) and 10 V (off), ideally
suited for offâline converters. The MC34065âL is tailored for lower voltage
applications having UVLO thresholds of 8.4 V (on) and 7.8 V (off).
⢠Unique Oscillator for Precise Duty Cycle Limit and Frequency Control
⢠Current Mode Operation to 500 kHz
⢠Automatic Feed Forward Compensation
⢠Separate Latching PWMs for CycleâByâCycle 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
Vref
15
1
Sync Input
3
RT
CT
2
Voltage
Feedback 1
4
Compensation 1
5
Drive Output
2
Enable
14
Voltage
Feedback 2 13
Compensation 2
12
Representative Block Diagram
VCC 16
5.0V
VCC
Reference
Undervoltage
R
Lockout
R
Vref
Undervoltage
Lockout
Oscillator
+
â
Error
Amp 1
Latching
PWM 1
Drive Output 1
7
Current Sense 1
6
+
â
Error
Amp 2
Gnd 8
Latching
PWM 2
Drive Gnd 9
Drive Output 2
10
Current Sense 2
11
HIGH PERFORMANCE
DUAL CHANNEL CURRENT
MODE CONTROLLERS
SEMICONDUCTOR
TECHNICAL DATA
P SUFFIX
PLASTIC PACKAGE
CASE 648
DW SUFFIX
PLASTIC PACKAGE
CASE 751G
(SOâ16L)
PIN CONNECTIONS
Sync Input 1
CT 2
RT 3
Voltage Feedback 1 4
Compensation 1 5
Current Sense 1 6
Drive Output 1 7
Gnd 8
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)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC34065DWâH
MC34065DWâL
MC34065PâH
TA = 0° to +70°C
SOâ16L
Plastic DIP
MC34065PâL
MC33065DWâH
MC33065DWâL
MC33065PâH
MC33065PâL
TA = â40° to +85°C
SOâ16L
Plastic DIP
MOTOROLA ANALOG IC DEVICE DATA
© Motorola, Inc. 1996
Rev 0
1
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