LinearVoltageRegulators Motorola Semiconductor Products, LinearVoltageRegulators Datasheet - Page 21

• Manufacturer Part Number: LinearVoltageRegulators
• Description: Analog And Interface Integratedcircuits Selector Guide & Cross Reference
• Manufacturer: Motorola Semiconductor Products

Switching Regulator Control Circuits
Single–Ended GreenLine
Enhanced Mixed Frequency Mode GreenLine
Fixed Frequency, Variable Frequency, Standby Mode
MC44603AP, DW
T A = –25 to +85 C, Case 648, 751G
ler that is specifically designed for off–line and dc–to–dc con-
verter applications. This device has the unique ability of auto-
matically changing operating modes if the converter output is
overloaded, unloaded, or shorted, offering the designer addi-
tional protection for increased system reliability. The
MC44603A has several distinguishing features when
compared to conventional SMPS controllers. These features
consist of a foldback facility for overload protection, a
standby mode when the converter output is slightly loaded, a
demagnetization detection for reduced switching stresses on
transistor and diodes, and a high current totem pole output
ideally suited for driving a power MOSFET. It can also be
used for driving a bipolar transistor in low power converters
(< 150 W). It is optimized to operate in discontinuous mode
but can also operate in continuous mode. Its advanced
design allows use in current mode or voltage mode control
applications.
Current or Voltage Mode Controller
High Safety Standby Ladder Mode GreenLine
MC44604P
T A = –25 to +85 C, Case 648
that is specifically designed for off–line and dc–to–dc con-
verter applications.
MC44604 offers enhanced safety and reliable power man-
agement 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).
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
MOTOROLA
50
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
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
The MC44603A is an enhanced high performance control-
The MC44604 is an enhanced high performance controller
The MC44604 is a modification of the MC44603. The
In addition, the MC44604 offers a new efficient way to
Controllers
(continued)
High Flexibility
Safety/Protection Features
GreenLine Controller: Low Power Consumption in
Standby Mode
High Flexibility
Safety/Protection Features
GreenLine
PWM Controller:
PWM Controller
Externally Programmable Reference Current
Secondary or Primary Sensing
Synchronization Facility
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
Overvoltage Protection Against Open Current and Open
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
Enhanced Output Drive
Low Startup and Operating Current
Fully Programmable Standby Mode
Controlled Frequency Reduction in Standby Mode
Low dV/dT for Low EMI Radiations
Externally Programmable Reference Current
Secondary or Primary Sensing
High Current Totem Pole Output
Undervoltage Lockout with Hysteresis
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
Low Startup and Operating Current
Patented Standby Ladder Mode for Low Standby Losses
Low dV/dT for Low EMI
Voltage Loop
ANALOG AND INTERFACE INTEGRATED CIRCUITS
SELECTOR GUIDE & CROSS REFERENCE
Controller: