ECRI Microelectronics

HSDF28S Series Transient Suppression DC DC Converters

1 Features of HSDF28S Series Transient Suppression DC/ DC Converters

High reliability

                              

Wide input voltage range:15V~50V, Typical
DC input voltage: 28V

Maximum input transient voltage:80V,1s

Output Power PO:20W

Operating temperature range Tc:-55℃~+125℃ 

Low Startup current 

No output overshoot

Inhibit function

Input under-voltage locked function

and output short circuit protection 

Maximum power density:38W/in3

Hermetically sealed metal case


2.  Scope of application of HSDF28S Series Transient Suppression DC DC Converters

High-reliability electronic system for aviation and aerospace, etc

3.  Descriptions of HSDF28S Series Transient Suppression DC DC Converters

The HSDF28S series transient suooression DC DC converter is high reliable and is featured with transient protection (80v, 1s) for DC DC converter. Single ended flyback, pulse width modulated and transformer magnetic feedback topology design are used in this product. The HSDF28S series transient suooression DC DC converter's operating principle is that the sampling signal of output voltage, coupled by the opto-coupler, works together with the sampling signal of input loop current to regulate the pulse width of the controller. The double loop control creates constant voltage output and short circuit protection.
Thick film hybrid techniques provides the HSDF28S Series converter with high reliability and optimum miniaturization. The design and manufacturing process of HSDF28S Series converters are in compliance with MIL-PRF-38534 and detailed specifications.

4. Technical Specifications of HSDF28S Series Transient Suppression DC DC Converters

Table  2  Rated conditions and recommended operating conditions

Absolute Max. Rating

Input voltage:15V~50V

Input voltage(Transient,1s):80V

Output Power:22W

Storage temperature:-65℃~150℃

Mechanical Shock:1500g

Weight(withoutflange/ with flange):31g/34g

Lead resistance welding temperature:300℃(15s)

Antistatic intensity:2000V


Table 3 Electrical characteristics

No.

Items

Conditions

HSDF28S5

HSDF28S5F

HSDF28S12

HSDF28S12F

HSDF28S15

HSDF28S15F

Min

Max

Min

Max

Min

Max

1

Input Voltage/V

Low, High, Ambient Temperature

15

50

15

50

15

50

2

Output Voltage/V

Io=Full

Load

Ambient

4.95

5.05

11.88

12.12

14.85

15.15

Low/high

4.92

5.08

11.82

12.18

14.77

15.23

3

Output current/A

VIN=15V~50V

3

1.67

1.33

4

Output Power/W


0

15

0

20

0

20

5

Output Ripple Voltage/mV

BW≤6MHz, Io=Full

load

50

50

50

6

Line Regulation/mV

VIN=15V~50V, Io=Full

20

20

20

7

LoadRegulation/mV

Io=No load tofull

50

50

50

8

Input current/mA

Inhibited

6

6

6

Io=no load

60

60

60

9

Input Ripple current/mA

BW≤20MHz, Io=Full

load

80

80

80

10

Efficiency/%

Io=Full

load

72

77

78

11

Isolation/MΩ

Input to output or any pin to case(except pin 7, 8)at 500V, Tc=25℃

100

100

100

12

Inhibit Function


0

0.7

0

0.7

0

0.7

13

Under-voltage open voltage/V

Io=Full

Load

12.0

14.8

12.0

14.8

12

14.8

14

Under-voltagecut-off voltage/V

Io=Full

Load

11.0

14.5

11.0

14.5

11

14.5

15

Short Circuit Protection





16

Capacitive load

/μF

Tc=25℃

1000

500

500

17

Switching frequency/kHz

Io=Full

Load

350

500

350

500

350

500

18

Step Load Response Transient(mV pK)

50%load→full load or

Full load50% load

700

500

500

19

Step Load Response Recovery(μs)

50%load→full load or

Full load→5 0%load

600

500

500

20

Step Line Response Transient(mV pK)

VIN:16V→40V,

VIN:40V→16V,Io=Full load

900

900

900

21

Step Line Response Recovery(μs)

VIN:16V→40V

VIN:40V→16V

Io=Full load

900

500

500

22

Start-up Overshoot(mV pK)

VIN:0→28V,

Io=Full load

25

50

50

23

Start-up Delay (ms)

VIN:0→28V,

Io=Full load

20

20

20


5. Circuit block diagram of HSDF28S Series Transient Suppression DC DC Converters

Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig 1 HSDF28S Series circuit block diagram

6.Typical Characteristic Curve(Testing condition as per Tc=25℃,VIN=28V±5%, unless otherwise specified) of HSDF28S Series Transient Suppression DC DC Converters


Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 2  HSDF28S15 Efficiency

Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 3  HSDF28S15 Step Line Response

Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 4  HSDF28S15 Step Load Response

Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 5  HSDF28S15 Start-up Overshoot/Start-up Delay

7.MTBF Curve of HSDF28S Series Transient Suppression DC DC Converters


Hybrid Surge Protection DC/D Converter(HSDF28S Series)

Fig. 6  MTBF Temperature Curve(HSDF28S15)

8. Pin Designation of HSDF28S Series Transient Suppression DC DC Converters



Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig 7  Pin Out Bottom View

Table 4  Pin Designation

Pin

Symbol

Designation

1

INH

Inhibit

2

NC

No connection

3

GNDO

Output Common

4

VO

Output

5

NC

No connection

6

GNDC

Case Ground

7

GNDI

Input Common

8

VIN

Positive Input


9. Typical Connection Diagram of HSDF28S Series Transient Suppression DC DC Converters


Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 8  Connection Diagram


Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 9   EMI Filter Connection Diagram

Hybrid Surge Protection DC/D Converter(HSDF28S Series)

Fig. 10  Inhibit Driver Circuit Diagram

10.Package Specifications (Unit: mm) of HSDF28S Series Transient Suppression DC DC Converters

① Package without flange
Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Hybrid Surge Protection DC/D Converter(HSDF28S Series)

Fig. 11  Bottom View

Fig. 12  Side View


② Package with Flange
Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Hybrid Surge Protection DC/D Converter(HSDF28S Series)

Fig. 13 Bottom View

Fig. 14  Side View


Table 5  Package Outline

Symbols

Unit/mm

Min

Typical

Max

A

-

8.4

8.90

A1

1.20

1.50

1.80

φb

0.63

0.76

0.89

D

-

28.44

28.94

E

-

36.83

37.33

e

-

20.32

-

e1

-

5.21

-

e2

-

12.83

-

e3

-

17.91

-

e4


22.99


e5

-

28.07

-

X


50.8

51.30

X1

43.45

43.95

44.45

P

3.00

3.30

3.60

L

5.35

6.35

-


Table 6  Case Materials

Case Model

Header

Header Plating

Cover

Cover Plating

Pin

Pin Plating

Seal

Notes

UPP3728-08t

(without flange)

Cold Rolled Steel(10#)

Ni

Kovar

(4J42)

Ni

Cu–coreCompound

Ni/Au

Parallel seam

Ni Plating is for case ground pin

UPP3728-08j

(with flange)

Cold Rolled Steel(10#)

Ni

Kovar

(4J42)

Ni

Cu–core Compound

Ni/Au

Parallel seam

Ni Plating is for case ground pin


11. Ordering Information of HSDF28S Series Transient Suppression DC DC Converters


Hybrid Surge Protection DC/D Converter(HSDF28S Series)

Hybrid Surge Protection DC/D Converter(HSDF28S Series)
Fig. 15  Part Numbering Key

Application Notes:

  • Both positive and negative terminals for power supply shall be correctly connected when power is applied so as to avoid permanent damage to the device.
  • Testing position shall be the pin bottom of the pin of the device when the electrical characteristic is measured.
  • The baseplate of the device shall be closely attached to the circuit board during device mounting so as to avoid the damage on pins. The shockproof actions shall be adopted when necessary.
  • Pins shall not be bended to avoid the glass insulator cracking and case leaking.
  • Pins at inhibit terminal shall be hung in the air during no operation.
  • When the temperature of case is 125℃, the thick of cooling fin (copper)should be 3mm and the area should be more than 70mm×50mm.
  • When ordering this device,the detail electrical specification shall be based on relevant standards. Data offered in this document shall be for reference only.


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