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MC33364 Datasheet PDF : 14 Pages
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Critical Conduction
GreenLine™ SMPS Controller
The MC33364 series are variable frequency SMPS controllers that operate
in the critical conduction mode. They are optimized for low power, high density
power supplies requiring minimum board area, reduced component count,
and low power dissipation. Each narrow body SOIC package provides a small
footprint. Integration of the high voltage startup saves approximately 0.7 W of
power compared to resistor bootstrapped circuits.
Each MC33364 features an on–board reference, UVLO function, a
watchdog timer to initiate output switching, a zero current detector to ensure
critical conduction operation, a current sensing comparator, leading edge
blanking, and a CMOS driver. Protection features include the ability to shut
down switching, and cycle–by–cycle current limiting.
The MC33364D1 is available in a surface mount SO–8 package. It has an
internal 126 kHz frequency clamp. For loads which have a low power
operating condition, the frequency clamp limits the maximum operating
frequency, preventing excessive switching losses and EMI radiation.
The MC33364D2 is available in the SO–8 package without an internal
frequency clamp.
The MC33364D is available in the SO–16 package. It has an internal
126 kHz frequency clamp which is pinned out, so that the designer can
adjust the clamp frequency by connecting appropriate values of resistance.
• Lossless Off–Line Startup
• Leading Edge Blanking for Noise Immunity
• Watchdog Timer to Initiate Switching
• Minimum Number of Support Components
• Shutdown Capability
• Over Temperature Protection
• Optional Frequency Clamp
MC33364
CRITICAL CONDUCTION
GREENLINE™ SMPS
CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
8
1
D1, D2 SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
16
1
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO–16)
PIN CONNECTIONS
Device
MC33364D1
MC33364D2
MC33364D
ORDERING INFORMATION
Operating
Temperature Range
TJ = –25° to +125°C
Package
SO–8
SO–8
SO–16
MC33364D1
MC33364D2
Zero Current 1
Current Sense 2
Voltage FB 3
Vref 4
8 Line
7 VCC
6 Gate Drive
5 P Gnd
(Top View)
FB
Current
Sense
ZC Det
Representative Block Diagram
Restart
Delay
PWM
Comparator
Leading
Edge
Blanking
Zero
Current
Detector
S
RQ
R
Watchdog
Timer
Thermal
Shutdown
Vref
UVLO
VCC
UVLO
Bandgap
Reference
Frequency
Clamp
This device contains 335 active transistors.
Line
VCC
Vref
Gnd
Gate
Optional
Frequency
Clamp
MC33364D
Zero Current 1
N/C 2
Current Sense 3
Voltage FB 4
N/C 5
Vref 6
N/C 7
Freq Clamp 8
16 Line
13 A VCC
12 P VCC
11 Gate Drive
10 P Gnd
9 A Gnd
(Top View)
This document contains information on a new product. Specifications and information herein
arMe OsuTbjOecRt tOo cLhAangAeNwAithLoOut GnotIiCce.DEVICE DATA
© Motorola, Inc. 1997
Rev 0
1
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