Datasheets

Push-Pull PWM Controller
The IPS201A and IPS201B are low-voltage PWM controllers that contains all the features needed to implement Push-Pull, Half-Bridge, and Full-Bridge topologies. They are used in switch mode power supplies to provide pulse width modulation to a pair of high voltage/high current MOSFETs. Both devices include an oscillator, error amplifier, current sensing, and a regulated voltage reference output.
The IPS201 is presented in voltage mode or current mode versions. Both the frequency and the dead time are set by the user by choosing the appropriate external RC components.

Features
Shunt regulator VCC supply for wide input voltage range
Two output drivers
External resistor/capacitor set the adjustable operating frequency and dead time
5V output and oscillator sawtooth are available to provide slope compensation
Available in versions utilizing voltage mode (IPS201A) or current mode control (IPS201B)
Voltage mode is available with two different overcurrent sense thresholds (60mV and 700mV)
Industrial temperature range (-40^oC to +85^oC) standard

Applications
AC / DC power supplies
DC / DC power supplies
Flourescent lamp drivers
DC / AC inverters

Power Factor Correction Controller
The IN-PLUG IPS101 is a primary-side switching controller which provides high performance active power factor correction (PFC). The PFC circuitry forces the SMPS to draw a current proportional to the instant AC line voltage in order to charge a storage capacitor thus resulting in excellent power factor and low-line harmonics generation. The output of the PFC is a regulated voltage which slightly exceeds the peak line voltage.

Features
Capable of driving a broad range of power MOSFETs
Uses a self-oscillating topology good to 300kHz
Voltage error amplifier with provision for loop stability compensation
High efficiency over 96% (in optimized designs)
Minimum external component count
3-input current-mode multiplier ensures good performance at any line voltage or load
Under-voltage protection. Cycle-by-cycle current limiting. Thermal shutdown

Applications
SMPS
Electronic ballast

Feedback Controllers With Low Current Sense Voltage
The IPS20 and IPS21 are low-voltage current sensing feedback controllers used in switch mode power supplies to control load-side current and voltage. They have been designed to limit the power dissipated in the sensing circuitry for high output current applications that require current limiting. They both incorporate a 4V shunt regulator for maximum flexibility to power the chip.

The IPS20 and IPS21 only differ by the characteristics of the current sensing references.The IPS20 incorporates a trimmed 50mV reference with a positive temperature coefficient which closely matches that of a PCB copper trace. This copper trace sensing method can be used inexpensively with very low associated power losses. The IPS21 incorporates a temperature compensated 100mV reference for more conventional resistors. Both controllers feature the same voltage regulator section with a trimmed temperature stable voltage reference of 1.19V.

Features
Dual precision regulators for SMPS voltage and current control
Output currents up to 50A
Output voltage down to 1.2V
50mV or 100mV current sensing voltage
1.20V voltage reference
Operates with grounded optocoupler
4V shunt regulator for VCC supply

Applications
Fast chargers for power tools and other applications
Battery eliminators
Industrial and bench-type power supplies
Distributed power systems

Current Mode PWM Controller
The AAC242/43 are PWM controllers designed as upgrades on the workhorse UC1/2/3842 and UC1/2/3843 family of Current Mode PWM Controllers, available from various sources. The AAC242/43 are intended for Offline or DC/DC power converter applications.

Features in common with the x842/x843 design include current mode control, pulse-pulse current limiting, undervoltage lockout with hysteresis and an on-board voltage reference. In addition, as with the x842/x843 controllers, the AAC242 is differentiated from the AAC243 by its undervoltage lockout thresholds. The AAC242 has turnon/turn-off thresholds of 16V and 10V respectively, while the AAC243 thresholds are 8.4V and 7.6V respectively. The AAC243 is targeted for battery applications, based on their lower undervoltage and hysteresis levels. The lower V-ILimit options of the AAC242/43 of 0.25V, as compared to the 1.0V for the AAC142/43, allow for lower current sense measurements.

Other features designed into this family of Current Mode Controllers are intended to enhance their functionality and range of use. The maximum Start-Up current is substantially lower than the x842/x843. Output drive rise and fall times of 50ns for the AAC242/43 compare to 150ns maximum rise and fall times for the x842/x843. Other unique features of the AAC242/43 include an integrated soft-start function tied to the clock of the internal oscillator (approximately 330 cycles), leading edge current blanking of 100ns and a more robust, higher current MOS output drive stage capable of driving much higher source and sink currents. The enhancements in drive capability, as well as rise and fall times, enable the AAC242/43 to operate up to 1MHz vs. the 500kHz maximum typically ascribed for the x842/843.

Features

• Pulse-Pulse Current Limiting, with 0.25V I-Limit Threshold (AAC242/43)
• On-Chip Bandgap Voltage Reference
• AAC242 Undervoltage Lockout with Hysteresis for 16V Turn-on/10V Turn-off
• AAC243 Undervoltage Lockout with Hysterisis for 8.4V Turn-on/7.6V Turn-off
• Overvoltage Protection Zener
• Enhanced Rise and Fall Performance, Higher Current Output Drive Stage for Operation to 1MHz
• Peak Current Mode Control
• Integrated Soft-Start Function, (~330 Clock Cycles)
• Leading Edge Current Blanking for Reduced Filtering (100ns)
• Offered in RoHS Compliant 8-Pin SOIC, 8-Pin PDIP, and 3mm x 3mm DFN Packages
• Rated for Extended Industrial Temperature Range (-40° C to +105° C)
• Evaluation Boards Available (AAEV242/243)

Applications

• Offline Power Converters
• DC/DC Converter
• LED Lighting

This family of 2N3418S through 2N3421S high-frequency, epitaxial planar transistors feature low saturation voltage and are qualified per MIL-PRF-19500/393. These devices are also available in TO-5 and low profile U4 packaging.  A standard commercial RoHS compliant version is also available with the "e3" suffix.