IS-1845ASEH Datasheet, PDF (1/3 Pages) Intersil Corporation – Single Event Radiation Hardened High Speed, Current Mode PWM

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Single Event Radiation Hardened High Speed, Current
Mode PWM
IS-1845ASRH, IS-1845ASEH
The IS-1845ASRH, IS-1845ASEH are
designed to be used in switching
TM
power supplies operating in current-
mode. The rising edge of the on-chip
oscillator turns on the output. Turn-off
is controlled by the current sense comparator and occurs when
the sensed current reaches a peak controlled by the error
amplifier.
Constructed with Intersil’s Rad Hard Silicon Gate (RSG)
dielectrically isolated BiCMOS process, these devices are
immune to single event latch-up and have been specifically
designed to provide a high level of immunity to single event
transients. All specified parameters are guaranteed and tested
for 300krad(Si) total dose performance at a high dose rate and
50krad(Si) total dose at a low dose rate.
Detailed Electrical Specifications for these devices are
contained in the SMD 5962-01509. A “hot-link” is also
provided on our website for downloading the SMD.
Features
• Electrically Screened to DSCC SMD # 5962-01509
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Environment
- High Dose Rate. . . . . . . . . . . . . . . . . . . . .300 krad(SI) (Max)
- Low Dose Rate . . . . . . . . . . . . . . . . . . . . . . 50 krad(SI) (Max)
- SEL Immune . . . . . . . . . . . . . . . . . . . . Dielectrically Isolated
- SEU Immune. . . . . . . . . . . . . . . . . . . . . . . . 35MeV/mg/cm²
- SEU Cross-Section at 89MeV/mg/cm² . . . . . . 5 x 10^-6cm²
• Low Start-up Current . . . . . . . . . . . . . . . . . . . . . . . 100µA (Typ)
• Fast Propagation Delay . . . . . . . . . . . . . . . . . . . . . . . 80ns (Typ)
• Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . 12V to 20V
• High Output Drive. . . . . . . . . . . . . . . . . . . . . . . . 1A (Peak, Typ)
• Undervoltage Lockout . . . . . 8.8V Start (Typ), 8.2V Stop (Typ)
Applications
• Current-Mode Switching Power Supplies
• Control of High Current FET Drivers
• Motor Speed and Direction Control
Pin Configurations
IS7-1845ASRH, IS7-1845ASEH
(8 LD CDIP2-T8 SBDIP)
TOP VIEW
COMP 1
VFB 2
ISENSE 3
RTCT 4
8 VREF
7 VCC
6 OUT
5 GND
NC
COMP
VFB
NC
NC
NC
ISENSE
RTCT
NC
IS9-1845ASRH, IS9-1845ASEH
(18 LD FLATPACK)
TOP VIEW
1
18
2
17
3
16
4
15
5
14
6
13
7
12
8
11
9
10
NC
VREF
VCC
VC
OUT
NC
GND
OSCGND
NC
NOTES:
1. Grounding the COMP pin does not inhibit the output. The output may be inhibited by applying >1.2V to the ISENSE pin.
2. This part should be operated with C_t = 3.3nF and R_t = 10k timing components only.
July 13, 2012
FN9001.5
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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