MC44604 Datasheet, PDF (1/2 Pages) ON Semiconductor – High Safety Pulsed Mode Stanby GreenLine PWM Controller

Order this document from Analog Marketing
MC44604
Product Preview
High Safety Standby
Ladder Mode GreenLine™
PWM Controller
The MC44604 is an enhanced high performance controller that is
specifically designed for off–line and dc–to–dc converter applications.
The MC44604 is a modification of the MC44603. The MC44604 offers
enhanced safety and reliable power management in its protection features
(foldback, overvoltage detection, soft–start, accurate demagnetization
detection). Its high current totem pole output is also ideally suited for driving
a power MOSFET but can also be used for driving a bipolar transistor in low
power converters (< 150 W).
In addition, the MC44604 offers a new efficient way to reduce the standby
operating power by means of a patented standby ladder mode operation of
the converter significantly reducing the converter consumption in standby
mode.
Current or Voltage Mode Controller
• Operation Up to 250 kHz Output Switching Frequency
• Inherent Feed Forward Compensation
• Latching PWM for Cycle–by–Cycle Current Limiting
• Oscillator with Precise Frequency Control
High Flexibility
• Externally Programmable Reference Current
• Secondary or Primary Sensing
• High Current Totem Pole Output
• Undervoltage Lockout with Hysteresis
Safety/Protection Features
• Overvoltage Protection Facility Against Open Loop
• Protection Against Short Circuit on Oscillator Pin
• Fully Programmable Foldback
• Soft–Start Feature
• Accurate Maximum Duty Cycle Setting
• Demagnetization (Zero Current Detection) Protection
• Internally Trimmed Reference
GreenLine™ Controller:
• Low Startup and Operating Current
• Patented Standby Ladder Mode for Low Standby Losses
• Low dV/dT for Low EMI
GreenLine is a trademark of Motorola, Inc.
HIGH SAFETY STANDBY
LADDER MODE GREENLINE™
PWM CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
PIN CONNECTIONS
VCC ₁
16 ^Rref
VC 2
Output 3
Gnd ₄
15 Standby Management
14 Error Amp Input
13 ^{Error Amp Output}
Foldback Input 5
Overvoltage
Protection
6
Current Sense Input 7
Demagnetization
Detection Input
8
12 Clamp Error Amp Input
11
Soft–Start/Dmax/
Votlage Mode
10 CT
9
Standby
Current Set
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
MC44604P TA = –25° to +85°C Plastic DIP
This document contains information on a product under development. Motorola reserves the
rig_Mht_Oto_Tc_Oha_Rng_Oe_Lor_Adi_Asc_Non_Atin_Lu_Oe _Gthis_ICpro_Ddu_Ec_Vt w_ICith_Eou_Dt n_Ao_Tti_Ace.
© Motorola, Inc. 1996
Issue 0
1