ISL78840ASEH Datasheet, PDF (1/15 Pages) Intersil Corporation – Radiation Hardened, High Performance Industry Standard Single-Ended Current Mode PWM Controller

Radiation Hardened, High Performance Industry
Standard Single-Ended Current Mode PWM Controller
ISL78840ASEH, ISL78841ASEH, ISL78843ASEH, ISL78845ASEH
The ISL7884xASEH is a high performance, radiation hardened
drop-in replacement for the popular 28C4x and 18C4x PWM
controllers suitable for a wide range of power conversion
applications including boost, flyback, and isolated output
configurations. Its fast signal propagation and output
switching characteristics make this an ideal product for
existing and new designs.
Features include up to 13.2V operation, low operating current,
90µA typical start-up current, adjustable operating frequency
to 1MHz, and high peak current drive capability with 50ns rise
and fall times.
Features
• Electrically Screened to DLA SMD # 5962-07249
• QML Qualified Per MIL-PRF-38535 Requirements
• 1A MOSFET Gate Driver
• 90µA Typical Start-up Current, 125µA Max
• 35ns Propagation Delay Current Sense to Output
• Fast Transient Response with Peak Current Mode Control
• 9V to 13.2V Operation
PART NUMBER
ISL78840ASEH
ISL78841ASEH
ISL78843ASEH
ISL78845ASEH
RISING UVLO
7.0
7.0
8.4V
8.4V
MAX. DUTY CYCLE
100%
50%
100%
50%
Specifications for Rad Hard QML devices are controlled by the
Defense Logistics Agency Land and Maritime (DLA). The SMD
numbers listed in the ordering information must be used when
ordering.
Detailed Electrical Specifications for the ISL788xASEH are
contained in SMD 5962-07249. A “hot-link” is provided on our
website for downloading.
Applications
• Adjustable Switching Frequency to 1MHz
• 50ns Rise and Fall Times with 1nF Output Load
• Trimmed Timing Capacitor Discharge Current for Accurate
Deadtime/Maximum Duty Cycle Control
• 1.5MHz Bandwidth Error Amplifier
• Tight Tolerance Voltage Reference Over Line, Load and
Temperature
• ±3% Current Limit Threshold
• Pb-Free Available (RoHS Compliant)
• Radiation Environment:
- High Dose Rate (50 - 300rad(Si)/s). . . . . . . . . 100 krad(Si)
- Low Dose Rate (0.01rad(Si)/s). . . . . . . 100 krad(Si) (Note)
NOTE: Product capability established by initial characterization. The
“EH” version is acceptance tested on a wafer by wafer basis to 50
krad(Si) at low dose rate.
• Current Mode Switching Power Supplies
• Isolated Buck and Flyback Regulators
• Boost Regulators
• Direction and Speed Control in Motors
• Control of High Current FET Drivers
Pin Configurations
ISL78840ASEH, ISL78841ASEH,
ISL78843ASEH, ISL78845ASEH
(8 LD FLATPACK)
TOP VIEW
COMP
FB
CS
RTCT
1
8
2
7
3
6
4
5
V_REF
V_DD
OUT
GND
ISL78840ASEH, ISL78841ASEH,
ISL78843ASEH, ISL78845ASEH
(8 LD SBDIP)
TOP VIEW
COMP 1
FB 2
CS 3
RTCT 4
8 V_REF
7 V_DD
6 OUT
5 GND
May 29, 2012
1
FN7952.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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