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Output Voltage (V) : 3V-13V
Input DC Voltage (V) : 12V～50V
Max. Output Power (W) : 1.62W

Product Detail

1. Features of HSSO28S Series of Surge Protection DC DC Converters

High reliability
Wide input voltage range：12V～50V，typical DC input voltage: 28V
Maximum input transient voltage：80V，1s
Output Power PO：1.5W
Operating temperature range Tc：-55℃～+125℃
Low Startup current
No output overshoot
Inhibit function
Under-voltage input lock and output short circuit protection
Hermetically sealed metal case

2. Scope of application of HSSO28S Series Surge Protection DC DC Converters

High-reliability electronic system for aviation , aerospace and some applications of high input transient suppression requirements.

3. Descriptions of HSSO28S Series of Surge Protection DC DC Converters

This series products are high reliable DC DC converter featured with transient protection (80 v, 1 s) . Single ended flyback, pulse width modulated and transformer magnetic feedback topology design are used in these products.,The operating principle is that the sampling signal of output voltage, coupled by the transformer, 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. Thick film hybrid techniques provide the HSSO28S Series converters with high reliability and optimum miniaturization. The design and manufacturing process of HSSO28S Series converters are in compliance with MIL-PRF-38534.

4.Technical Specifications of HSSO28S Series of Surge Protection DC DC Converters

Table 2 Rated conditions and recommended operating conditions

Absolute Max. Rating

Input voltage：12V～50V

Input voltage（Transient,1s）：80V

Output Power：1.62W

Storage temperature：-65℃～150℃

Mechanical Shock：1500g

Lead resistance to welding temperature：300℃（15s）

Weight：11g

Antistatic intensity：2000V

Table 3 Electrical characteristics

No.	Items	Condition （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）		HSSO28S3R3		HSSO28S5		HSSO28S12
No.	Items	Condition （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）		Min	Max	Min	Max	Min	Max
1	Input Voltage/V	Low、High、Ambient Temperature		12	50	12	50	15	50
2	Output Voltage/V	Full Load	Ambient	3.267	3.333	4.95	5.05	11.88	12.12
2	Output Voltage/V	Full Load	Low/high	3.17	3.43	4.8	5.2	11.52	12.48
3	Output current/A	VIN=12V～50V		―	0.3	―	0.3	―	0.125
4	Output Power/W			0	1	0	1.5	0	1.5
5	Output Ripple Voltage/mV	BW≤20MHz，Full load		―	50	―	50	―	50
6	Line Regulation/mV	VIN=12V～50V，Full load		―	150	―	150	―	60
7	Load Regulation/mV	10% load →full		―	400	―	400	―	700
7	Load Regulation/mV	50% load→full		―	250	―	250	―	250
8	Input current/mA	Inhibited		―	3.5	―	3.5	―	3.5
8	Input current/mA	Io=no load		―	10	―	10	―	10
9	Input Ripple current/mA	BW≤20MHz, Full load			30	―	30	―	30
10	Efficiency/%	Full load		69		72	―	75	―
11	Isolation/MΩ	Input to output or any pin to case at 500V，Tc=25℃		100		100	―	100	―
12	Inhibitvoltage			0	0.7	0	0.7	0	0.7
13	Under voltageturn-on voltage/V	Full load		6.5	11.5	6.5	11.5	6.5	11.5
14	Short Circuit Protection			With		With		With
15	Capacitive load /μF	Tc=25℃		-	500	―	500	―	200
16	Switching frequency/kHz	Full Load		325	475	325	475	325	475
17	Step Load Response Transient(mV pK)	50%load→full load or full load→50%load		-300	300	-300	300	-300	300
18	Step Load Response Recovery(μs)	50%load→full load or full load→50%load		―	500	―	600	―	400
19	Step Line Response Transient(mV pK)	VIN：12V→50V， VIN：50V→12V，Io=Full load		-300	300	-400	400	-400	400
20	Step Line Response Recovery(μs)	VIN：12V→50V VIN：50V→12V Io=Full load		―	500	―	600	―	400
21	Start-up Overshoot(mV pK)	VIN：0→28V， Io=Full load		―	15	―	25	―	50
22	Start-up Delay (ms)	VIN：0→28V， Io=Full load		―	20	―	20	―	20

Form 3（Continued） Electrical characteristics

No.	Items	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）		HSS028S15
No.	Items	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）		Min	Max
1	Input Voltage/V	Low、High、Ambient Temperature		12	50
2	Output Voltage/V	Io=Full Load	Ambient	14.85	15.15
2	Output Voltage/V	Io=Full Load	Low/high	14.40	15.60
3	Output current/A	VIN=12V～50V		―	0.05
4	Output Power/W			0	1.5
5	Output Ripple Voltage/mV	BW≤20MHz，Full load		―	50
6	Line Regulation/mV	VIN=12V～50V，Full load		―	60
7	Load Regulation/mV	10% load →full		―	700
7	Load Regulation/mV	50% load→full		―	250
8	Input current/mA	Inhibited		―	3.5
8	Input current/mA	Io=no load		―	10
9	Input Ripple current/mA	BW≤20MHz，Io=Full load		―	50
10	Efficiency/%	Fullload		76	―
11	Isolation/MΩ	Input to output or any pin to case at 500V，Tc=25℃		100	―
12	Inhibitvoltage			0	0.7
13	Under voltage open voltage/V	Full load		6.5	11.5
14	Short Circuit Protection			With
15	Capacitive load /μF	Tc=25℃		―	200
16	Switching frequency/kHz	Io=Full Load		325	475
17	Step Load Response Transient(mV pK)	50%load→full load or full load→50%load		-300	300
18	Step Load Response Recovery(μs)	50%load→full load or full load→50%load		―	400
19	Step Line Response Transient(mV pK)	VIN：12V→50V， VIN：50V→12V，Io=Full load		-400	400
20	Step Line Response Recovery(μs)	VIN：12V→50V VIN：50V→12V Io=Full load		―	400
21	Start-up Overshoot(mV pK)	VIN：0→28V， Io=Full load		―	50
22	Start-up Delay (ms)	VIN：0→28V， Io=Full load		―	20
a. Theoutput load should not be less than 10% of the rated load.

5. Circuit block diagram of HSSO28S Series of Surge Protection DC DC Converters

Fig 1 HSSO28S Series circuit block diagram

6. Typical Characteristic Curve of HSSO28S Series of Surge Protection DC DC Converters (Testing condition as per Tc=25℃，VIN=28V±5%,unless otherwise specified)

Fig 2 HSSO28S15 Efficiency Curve

Fig 4 HSSO28S15 Step Load Response

Fig 5 HSSO28S15 Start-up Overshoot/Start-up Delay

7. MTBF Curve of HSSO28S Series of Surge Protection DC DC Converters

Fig 6 MTBF Temperature Curve（HSSO28S15）

（Well ground condition）

8. Pin Designations of HSSO28S Series of Surge Protection DC DC Converters

Fig 7 Bottom View

Table 4 Pin Designations

Pin	Symbol	Designation
1	VIN	Positive input
2	GNDI	Input ground
3	VO	Positive output
4	GNDO	Output ground
5	GNDC	Case ground
6	NC	NC
7	INH	Inhibit

9. Typical Connection Diagram of HSSO28S Series of Hybrid Surge ProtectionTransient Suppression DC DC Converters

Fig 8 Connection Diagram

Fig 9 EMI Filter Connection Diagram

Fig 10 Inhibit Driver Circuit Diagram

10．Package Specifications (Unit: mm) of HSSO28S Series of Surge Protection DC DC Converters

Fig 11 Bottom View

Fig 12 Side View

Table 5 Package Outline

Symbols	Unit/mm
Symbols	Minimum	Nominal	Maximum
A	-	-	7.38
фb	0.32	-	0.58
b1	2.16	-	2.76
b2	3.13	-	3.73
D	-	-	25.14
E	-	-	20.66
e	2.24	2.54	2.84
e1	4.78	5.08	5.38
e2	9.86	10.16	10.46
e3	17.28	17.78	18.28
e4	14.74	15.24	15.74
L	5.86	-	-
注:e、e1、e2、e3、e4 are interchangeable size, made by the shell manufacturing and inspection, this specification does not do the assessment requirements.

Table 6 Case Materials

Case Model	Header	Header Plating	Cover	Cover Plating	Pin	Pin Plating	Sealing	Notes
UPP2520-07	High quality carbon structural steel（08AL）	Au	SPCC-SD	Ni	4J50	Au	Energy storage welding

11. Ordering Information of HSSO28S Series of Surge Protection DC DC Converters

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 root 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 using, the output load should not be less than 10% of the rated load
When ordering this device，the detail electrical specification shall be based on relevant standards. While data offered in this document shall be for reference only.

Tags : 12V～50V Input voltage Surge Protection DC DC Converters 3V-13V Output voltageSurge Protection DCDC Converters Thick Film Surge Protection DCDC Converters

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