INHIBIT

TYPICAL CHARACTERISTICS

RECOMMENDED OPERATING CONDITIONS

SINGLE AND DUAL OUTPUT MODELS

MSR2805S

MSR2812D

MSR2815D

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

4.90

5.0

5.10

±11.88

±12

±12.12

±14.85

±15

±15.15

VDC

OUTPUT CURRENT

—

—

700

—

—

±167

—

—

±133

mA

OUTPUT POWER

Tc = –55°C TO +85°C

—

—

3.5

—

—

4.0

—

—

4.0

W

OUTPUT RIPPLE

BW = DC TO 1 MHz

—

75

150

—

75

150

—

75

150

mV p-p

LINE REGULATION

—

5

10

—

10

20

—

10

20

mV

LOAD REGULATION

NO LOAD TO FULL

—

25

50

—

12

24

—

12

24

mV

INPUT VOLTAGE

Tc = –55°C TO +85°C

16

28

32

16

28

32

16

28

32

VDC

TRANSIENT 50 ms

—

—

40

—

—

40

—

—

40

V

INPUT CURRENT

NO LOAD

—

7

10

—

10

15

—

10

15

FULL LOAD

—

—

192

—

—

213

—

—

213

mA

INHIBITED

—

—

2

—

—

15

—

—

15

EFFICIENCY

65

70

—

67

70

—

67

70

—

%

B4-28

MSR SERIES

4 WATT

ABSOLUTE MAXIMUM RATINGS

Input Voltage Range

• 16 to 32 VDC continuous

• 40 V for 50 msec transient

Case Operating Temperature (Tc)

• –55°C to +85°C full power

• –55°C to +115°C absolute

Derating Output Power/Current

• Linearly from 100% at 85°C to 0% at 115°C

Inhibit TTL Open Collector

• Logic low (output disabled)

≤ 0.8 V

• Referenced to input common

• Logic high (output enabled)

≥ 12 V

Open collector

Required

Minimum

Model

Connection

Single Output

Positive Output (12 & 13) to

MSR2805S

Output Common (8 & 9)

220 µF, 10 V

Positive Output (10) to

Output Common (8)

100 µF, 25 V

MSR2812D

External Capacitor (14) to

100 µF, 25 V

and

MSR2815D

Negative Output (12) to

10 µF, 25 V

Output Common (8)

FEEDBACK

LOGIC

TIMING

CONTROL

SWITCH

10

POSITIVE

OUTPUT

8

12

1, 2

POSITIVE

INPUT

15

INHIBIT

17, 18

INPUT

COMMON

14

NEGATIVE

OUTPUT

OUTPUT

COMMON

EXTERNAL

CAPACITOR

TERMINAL

100

µF

10

µF

100

µF

+

+

+

EXTERNAL

CAPACITORS

VOLTAGE

REGULATOR

Notes – Table 1

1. Capacitors should be high quality, low ESR components —

solid tantalum is recommended.

2. See Figure 1 for connection diagram

3. Place positive side of capacitor toward pin 8.

TABLE 1: EXTERNAL CAPACITOR REQUIREMENTS

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

Input Voltage

• 16 to 32 VDC

Output Power

• 3.2 to 4 watts depending on model

Lead Soldering Temperature (10 sec per lead)

• 300°C

Storage Temperature Range (Case)

• –-65°C to +150°C

Output Voltage Temperature Coefficient

• MSR2805S 100 ppm/°C typ, 200 max.

• MSR28XXD 50 ppm/°C typ

• MSR285XXT 100 ppm/°C typ

Input to Output Capacitance

• 60 pF typical

Isolation

• 100 megohm minimum at 500 V

Conversion Frequency

• Single and dual output models, 80 kHz at

full load typical, variable frequency

• Triple output models, 200 kHz typical

fixed frequency

Inhibit Pin Voltage (unit enabled)

• 12 to 28 V

Notes

1. External capacitors required to prevent damage to internal circuitry (see

Table 1 for specifications).

2. Dual output models deliver up to 4 watts total for balanced or unbalanced

loads, however, the positive output should carry at least 25% of the total load.

SINGLE AND DUAL OUTPUT EXTERNAL CAPACITORS