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Texas Instruments UC1825B-SP | Demoboard UC1825BEVM-CVAL
Class-V, radiation hardened high-speed PWM controller
Overview
| Topology | Push-Pull Converter symmetrical isolated |
| Input voltage | 22-48 V |
| Switching frequency | 1000 kHz |
| Output 1 | 5 V / 10 A |
Description
The UC1825B-SP PWM control device is optimized for high-frequency switched mode power supply applications. Particular care was given to minimizing propagation delays through the comparators and logic circuitry while maximizing bandwidth and slew rate of the error amplifier. This controller is designed for use in either current-mode or voltage mode systems with the capability for input voltage feed-forward.Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft start pin which will double as a maximum duty-cycle clamp. The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis assures low start up current. During undervoltage lockout, the outputs are high impedance.This device features totem pole outputs designed to source and sink high peak currents from capacitive loads, such as the gate of a power MOSFET. The on-state is designed as a high level.
Features
- QML-V qualified, SMD 5962-8768106
- 5962R8768106VYC:◦Radiation hardness assurance (RHA) up to 100-krad(Si) total ionizing dose (TID) (1)
- Compatible with voltage- or current-mode topologies
- Practical operation switching frequencies to 1 MHz
- 50-ns propagation delay-to-output
- High-current dual totem pole outputs (2-A peak)
- Wide bandwidth error amplifier
- Fully latched logic with double-pulse suppression
- Pulse-by-pulse current limiting
- Soft start/maximum duty-cycle control
- Undervoltage lockout with hysteresis
- Low start-up current (1.1 mA)
(1)Radiation tolerance is a typical value based upon initial device qualification with dose rate = 10 mrad/s. Radiation Lot Acceptance Testing is available - contact factory for details.
Typical applications
- Space launch vehicles
- Satellite buses and payloads
- Radiation-hardened DC-DC converters
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Operating Temperature | Q(%) | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Wire Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 50 V(DC), 100 pF, ±5% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance100 pF | Capacitance±5% | Rated Voltage50 V (DC) | Size0603 | Operating Temperature -55 °C up to +125 °C | Q-Factor1000 % | – | Insulation Resistance10 GΩ | Ceramic TypeNP0 Class I | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 470 pF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance470 pF | Capacitance±10% | Rated Voltage50 V (DC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 16 V(DC), 220 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 16 V(DC) | Capacitance220 nF | Capacitance±10% | Rated Voltage16 V (DC) | Size0603 | Operating Temperature -55 °C up to +125 °C | – | Dissipation Factor5 % | Insulation Resistance2.3 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | |||||
 | WE-HCF SMT High Current Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | – | – | – | Size2013 | Operating Temperature -40 °C up to +125 °C | – | – | – | – | Length20.8 mm | Width20.5 mm | Height13.5 mm | – | – | Inductance2.2 µH | Performance Rated Current39.5 A | Saturation Current @ 10%47 A | Saturation Current @ 30%52 A | DC Resistance1.65 mΩ | Self Resonant Frequency32 MHz | Wire TypeFlat | ||||
 | 750311765 | Transformer, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Transformer | – | – | – | SizeToroid | Operating Temperature -40 °C up to +85 °C | – | – | – | – | Length9.02 mm | Width8.64 mm | Height7.62 mm | – | PackagingTape and Reel | Inductance1200 µH | – | – | – | – | – | – | ||
750318061 | Push-Pull Transformer, –, – | Simulation– | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series Push-Pull Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |