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This series products are high reliable hybrid thick film large power military grade DC/DC converter. By using half-bridge circuit topology and pulse width modulation principle, the output sampling voltage isolated by opto coupler to modulate the pulse width and form the closed-loop control to make the product a stable voltage output.

Single/Double/Triple : Single
Output Voltage (V) : 15.5V～41V
Max. Output Power (W) : 120W

Product Detail

1. Features of HOL28S Series Thick Film Hybrid Integrated DC-DC Converters

High reliability
Input voltage range：16V～40V，Typical DC input voltage: 28V
Output power PO：66W～120W
Operating temperature range Tc：-55℃～+125℃
Low Start-up current
No output overshoot
Inhibit function
under-voltage and short circuit protection
Output short circuit and over-current protection
Output voltage fine tunable
Output sensing function
Maximum power density：100W/in3
Efficiency 92%
Hermetically sealed metal cases

2. Scope of application of HOL28S Series Hybrid Integrated DC DC Converters

High-reliability electronic system for aviation and aerospace, weapon and ships etc.

3. Description of HOL28S Series Hybrid Integrated DC to DC Converters

This series products are high reliable hybrid thick film large power DC/DC converter. By using half-bridge circuit topology and pulse width modulation principle, the output sampling voltage isolated by opto coupler to modulate the pulse width and form the closed-loop control to make the product a stable voltage output. This series products are made by thick film hybrid integrated process, hermetically sealed metal cases. Product design and manufacturing meets MIL-PRF-38534 requirements. Customers can connect the matching power EMI filters in the input port to improve the product’s electromagnetic compatibility.

4. Electrical performance of HOL28S Series Hybrid Integrated DC-DC Converters

Tabel2 Rated conditions and recommended operating conditions

Absolute Max. Rated value

Output voltage：15.5V～41V

Output power：120W

Storage temperature：-65℃～150℃

Mechanical Shock：1500g

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

Weight：100g

ESD：2000V

Table 3 Electric characteristics

No.	Parameter	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）			HOL28S5		HOL28S6R3		HOL28S9R5
No.	Parameter	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）			Min	Max	Min	Max	Min	Max
1	Input voltage/V	Low、High、Ambient Temperature			16	40	16	40	16	40
2	Output voltage/V	Full load	Ambient		4.9	5.1	6.25	6.35	9.405	9.595
2	Output voltage/V	Full load	Low/high		4.8	5.2	6.2	6.4	9.405	9.595
3	Output current/A	VIN=16V～40V			-	24	-	16.8	-	12.6
4	Output Power/W				-	120	-	105	-	120
5	Output Ripple Voltage/mV	BW≤20MHz，Full load			-	100	-	100	-	100
6	Line Regulation/mV	VIN=16V～40V，Full load			-	50	-	20	-	95
7	Load Regulation/mV	No load to full			-	50	-	63	-	95
8	Input current/mA	Inhibited			-	10	-	10	-	10
8	Input current/mA	Io=no load			-	150	-	120	-	160
9	Input Ripple current/mA	BW≤20MHz，Full load			-	200	-	200	-	200
10	Efficiency/%	Full load		Ambient	90	-	90	-	90	-
10	Efficiency/%	Full load		Low/high	86	-	86	-	88	-
11	Isolation/MΩ	Input to output or any pin to case at 500V，Tc=25℃			100	-	100	-	100	-
12	Inhibit voltage				-	0.3	-	0.3	-	0.3
13	Inhibit open circuit voltage/V	Full load			1.25	4	1.25	4	1.25	4
14	Under voltage turn-on voltage/V	Full load			14.5	15.5	14.5	15.5	14.5	15.5
15	Under voltage cut-off voltage/V	Full load			14	15	14	15	14	15
16	Short Circuit Protection power consumption	-			-	20	-	20	-	20
17	Capacitive load/μF	Tc=25℃			-	1000	-	1000	-	1000
18	switching frequency/kHz	Full load			250	350	250	350	250	350
19	Step Load Response Transient(mV pK)	50%load→full load or Full load →50% load			-	800	-	500	-	800
20	Step Load Response Recovery(μs)	50%load→full load or Full load →50% load			-	600	-	500	-	800
21	Step Line Response Transient(mV pK)	VIN：16V→40V， VIN：40V→16V，Io=Full load			-	600	-	500	-	600
22	Step Line Response Recovery(μs)	VIN：16V→40V， VIN：40V→16V，Io=Full load			-	1500	-	1500	-	2000
23	Start-up Overshoot(mV pK)	VIN：0→28V， Io=Full load			-	50	-	63	-	95
24	Start-up Delay (ms)	VIN：0→28V， Io=Full load			-	20	-	20	-	10

Table 3-2 Electric characteristics

No.	Parameter	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）			HOL28S24		HOL28S28		HOL28SXX
No.	Parameter	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）			Min	Max	Min	Max	Min	Max
1	Input voltage/V	Low、High、Ambient Temperature			16	40	16	40
2	Output voltage/V	Full load	Ambient		23.7	24.3	27.7	28.3
2	Output voltage/V	Full load	Low/high		23.7	24.3	27.7	28.6
3	Output current/A	VIN=16V～40V			-	5	-	4.2
4	Output Power/W				0	120	-	120
5	Output Ripple Voltage/mV	BW≤20MHz,Full load			-	200	-	200
6	Line Regulation/mV	VIN=16V～40V,Full load			-	240	-	280
7	Lode Regulation/mV	No load to full			-	240	-	280
8	Input current/mA	Inhibited			-	15	-	15
8	Input current/mA	Io=no load			-	80	-	80
9	Input Ripple current/mA	BW≤20MHz, Full load			-	200	-	200
10	Efficiency/%	Full load		Ambient	87	-	88	-
10	Efficiency/%	Full load		Low/high	85	-	87	-
11	Isolation/MΩ	Input to output or any pin to case at 500V，Tc=25℃			100	-	100	-
12	Inhibit voltage				-	0.3	-	0.3
13	Inhibit open circuit voltage/V	Full load			1.25	4	1.25	4
14	Under voltage open voltage/V	Full load			14.5	15.5	14.5	15.5
15	Under voltage cut-off voltage/V	Full load			14	15	14	15
16	Short Circuit Protection	-			-	15	-	15
17	Capacitive load/μF	Tc=25℃			-	200	-	200
18	switching frequency/kHz	Full load			250	350	250	350
19	Step Load Response Transient(mV pK)	50%load→full load or Full load →50% load			-	2000	-	1400
20	Step Load Response Recovery(μs)	50%load→full load or Full load →50% load			-	800	-	800
21	Step Line Response Transient(mV pK)	VIN：16V→40V， VIN：40V→16V，Io=Full load			-	-	-	-
22	Step Line Response Recovery(μs)	VIN：16V→40V， VIN：40V→16V，Io=Full load			-	-	-	-
23	Start-up Overshoot(mV pK)	VIN：0→28V， Io=Full load			-	150	-	150
24	Start-up Delay (ms)	VIN：0→28V， Io=Full load			-	50	-	20

5. Circuit block diagram of HOL28S Series Hybrid Integrated DC DC Converters

Fig 1 HOL28S Series circuit block diagram

6.Typical Performance Curves (Testing condition as per Tc=25℃，VIN=28V±5%, Full load, unless otherwise specified)

Fig 2 HOL28S5 Efficiency curves

Fig 3 HOL28S5 Input Step Curve

Fig 4 HOL28S5 Step Load Response

Fig 5 HOL28S5 Start-up Overshoot/Start-up Delay

7. MTBF Curves of HOL28S Series Hybrid Integrated DC to DC Converters

Fig 6 MTBF Temperature Curves（HOL28S5）

（Well ground condition）

8. Pin Designations of HOL28S Series Hybrid Integrated DC-DC Converters

Figure 7 Pin Out Bottom View

Pin Designation

Pin	Symbol	Designation	Pin	Symbol	Designation
1	VI	Positive input	8	Vo	Output
2	GNDI	Input ground	9	GNDO	Output ground
3	TRIM	Trimming	10	SEN-	Negative output sensing
4	INH1	Primary Inhibit	11	SEN+	Positive output sensing
5	NC	NC	12	SHARE	Current flow control terminal
6	SYNI	Synchronous input	13	NC	NC
7	NC	NC	14	NC	NC

Notes：HOL28S5、HOL28S24、HOL28S28（This three models using this package type）

Figure 8 Pin out Bottom View

Pin Designation

Pin	Symbol	Designation	Pin	Symbol	Designation
1	VI	Positive input	7	Vo	Output
2	GNDI	Input ground	8	GNDO	Output ground
3	TRIM	Trimming	9	SEN-	Negative output sensing
4	INH1	Primary Inhibit	10	SEN+	Positive output sensing
5	NC	NC	11	SHARE	Current flow control terminal
6	SYNI	Synchronous input	12	NC	NC

Notes: Subsequent series of products designed in the form of the package

9. Typical Connection Diagram of HOL28S Series Hybrid Integrated DC to DC Converters

Fig 9 Products Using Connection Diagram

Fig 10 EMI Filter Connection Diagram

10. Package Specifications of HOL28S Series Hybrid Integrated DC DC Converters

Fig 11 Bottom View

Table 4 Package Outline

Dimension Symbols	Unit/mm
Dimension Symbols	Minimum	Nominal	Maximum
A	-	-	10.66
A1	0.97	-	1.57
A2	5.29	-	5.89
φb	0.87	-	1.13
D	-	-	64.00
E	-	-	38.60
e	3.7	-	4.3
L	5.35	-	-
φP	3.00		3.60
Y	31.50		32.50
X1	69.60		70.60
X	-	-	76.70
Notes:e is interchangeable size, made by the shell manufacturing and inspection, this specification does not do the assessment requirements.

Table 5 Case Materials

Case Model

Header

Header Plating

Cover

Cover Plating

Pin Plating

Sealing Style

Notes

fpp6438-14d

Cold Rolled Steel（10#）

Dau-2/Ni4Au1.0

Kovar

(4J42)

Oxygen-free copper

Parallel seam welding

Fig 12 Bottom View

Table 6 Package Outline

Dimension Symbols	Unit/mm
Dimension Symbols	Minimum	Nominal	Maximum
A	-	-	10.66
A1	5.29		5.89
φb	0.87		1.13
D	-	-	76.70
E	-	-	38.60
e	-	5.08	-
L	5.35	-	-
φP	3.00	-	3.60
X1	69.90	70.1	70.3
X2	-	-	64.00
Y1	31.80	32	32.20
Notes:e is interchangeable size, made by the shell manufacturing and inspection, this specification does not do the assessment requirements.

Table 7 Package Outline

Case Model

Header

Header Plating

Cover

Cover Plating

Pin Plating

Sealing Style

Notes

fpp6438-12d

Cold Rolled Steel（10#）

Dau-2/Ni4Au1.0

Kovar

金(4J42)

Oxygen-free copper

Parallel seam welding

11. Ordering Information of HOL28S Series Hybrid Integrated DC-DC Converters

Fig 13 Part Numbering Key

Applications 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 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 : Single DC-DC converters military grade DC-DC Converter thick film DC-DC Converter

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