UC1825B-SP Class-V, radiation hardened high-speed PWM controller | TI.com

UC1825B-SP (ACTIVE) Class-V, radiation hardened high-speed PWM controller

 

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.

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Parametrics

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Part number Order Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
UC1825B-SP Order now Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Peak Current Mode
Voltage    
10     30       10/9.2     80       Adjustable Switching Frequency
Enable/Shutdown
Error Amplifier
Integrated Gate Drivers
Programmable Soft Start
Soft Start    
Space     -55 to 125     CFP | 16     16CFP: 72 mm2: 7.1 x 10.16 (CFP | 16)    
UC1825A-SP Samples not available Boost
Flyback
Forward
Full-Bridge
Half-Bridge
Push-Pull    
Current     10     30     1000     9.2/8.4     50     2     Error Amplifier
Leading Edge Blanking
Multi-topology
Soft Start
Synchronization Pin    
Space     -55 to 125     CDIP | 16
CFP | 16
LCCC | 20    
16CDIP: 135 mm2: 6.92 x 19.56 (CDIP | 16)
16CFP: 72 mm2: 7.1 x 10.16 (CFP | 16)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1843-SP Samples not available Boost
Flyback
Forward    
Current     8.5     30     500     8.4/7.6     100     1     Error Amplifier
Multi-topology    
Space     -55 to 125     CDIP | 8
LCCC | 20    
8CDIP: 64 mm2: 6.67 x 9.6 (CDIP | 8)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1843A-SP Samples not available Boost
Flyback
Forward    
Current     12     25     500     8.4/7.6     100     1     Error Amplifier
Multi-topology    
Space     -55 to 125     CDIP | 8
CFP | 10
LCCC | 20    
8CDIP: 64 mm2: 6.67 x 9.6 (CDIP | 8)
10CFP: 45 mm2: 6.48 x 7.02 (CFP | 10)
20LCCC: 79 mm2: 8.89 x 8.89 (LCCC | 20)    
UC1843B-SP Samples not available Boost
Buck
Flyback
Forward    
Peak Current Mode
Voltage    
12     25     500     8.4/7.7     100       Error Amplifier
Multi-topology    
Space     -55 to 125     CFP | 10     10CFP: 45 mm2: 6.48 x 7.02 (CFP | 10)