ST1843 datasheet(1/25 Pages) STMICROELECTRONICS

部件名	ST1843

功能描述	Rad-tolerant current mode PWM controller

PDF	25 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 25 page

September 2011

Doc ID 019049 Rev 1

1/25

25

ST1843

ST1845

Rad-tolerant current mode PWM controller

Features

■ Oscillator frequency guaranteed at 250 kHz

■ Trimmed oscillator for precise frequency

control

■ Current mode operation to 500 kHz automatic

feed forward compensation

■ Latching PWM for cycle-by-cycle current

limiting

■ Internally trimmed reference with undervoltage

lockout

■ High current totem pole output

■ Undervoltage lockout with hysteresis

■ Low start-up and operating current

■ Hermetic package

■ 50 and 100 krad (Si)

■ SEL free @ 120 MeV/cm2/mg at 125°C

Description

The ST1843HR and ST1845HR ICs are rad-

tolerant current mode PWM controllers providing

an industry standard solution for the

implementation of provides the off-line or DC to

DC fixed frequency current mode control

schemes with a minimal external parts count.

Its radiation hardness and hermetic packaging

makes it an ideal choice for aerospace and other

harsh environments.

Flat-8

Table 1.

Device summary

Order codes Duty cycle max Radiation level

Quality level

EPPL Package Lead finish Mass (g)

ST1843K1

100%

50 krad (Si)

Engineering Model

-

Flat-8

Gold

0.45

ST1843FKG

100%

50 krad (Si)

According to ESCC Target

Flat-8

Gold

0.45

ST1845K1

50%

100 krad (Si)

Engineering Model

-

Flat-8

Gold

0.45

ST1845RKG

50%

100 krad (Si)

According to ESCC Target

Flat-8

Gold

0.45

www.st.com

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