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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 optocoupler to modulate the pulse width and form the closed-loop control to make the product a stable voltage output.

Single/Double/Triple : Double
Output Voltage (V) : 15.5V～41V
Max. Output Power (W) : 150W

Product Detail

1. Features of HOL28D Series Thick Film DC-DC Converter

High reliability
Input voltage range：16V～40V，Typical DC input voltage :28V
Output power PO：100W～150W
Operating temperature range Tc：-55℃～+125℃ Low Start-up current
No output overshoot
Inhibit function
under-voltage and over-voltage lock
Output short circuit and over-current protection
Output voltage fine tunable
Output sensing function
Maximum power density：100W/in3
Efficiency 90%
Hermetically sealed metal cases

2. Scope of application of HOL28D Series Thick Film DC-DC Converter

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

3. Description of HOL28D Series Thick Film DC-DC Converter

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 optocoupler 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 HOL28D Series Thick Film DC-DC Converter

Tabel2 Rated conditions and recommended operating conditions

Absolute Max. Rated value

Output voltage：15.5V～41V

Output power：150W

Storage temperature：-65℃～150℃

Mechanical Shock：1500g

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

Weight：100g

ESD：2000V

Table 3-1 Electric characteristics

No.	Parameter	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）		HOL28D9R5				HOL28D12		HOL28D15
				Min		Max		Min	Max	Min	Max
1	Input voltage/V	Low、High、Ambient Temperature		16		40		16	40	16	40
2	Output voltage/V	Positive	Ambient, Full load	9.31		9.69		11.80	12.2	14.70	15.30
		Negative		-9.69		-9.31		-12.20	-11.80	-15.30	-14.70
		Positive	Low/high, Full load	9.31		9.69		11.80	12.20	14.70	15.30
		Negative		-9.69		-9.31		-12.20	-11.80	-15.30	-14.70
3	Output current/A	VIN=15V～50V		―		6.3		―	5	―	5
4	Output Power/W			―		120		―	120	―	150
5	Output Ripple Voltage/mV	BW≤20MHz，Full load		―		100		―	120	―	150
6	Line Regulation/mV	Positive	VIN=16V～40V，Full load	―		95		―	120	―	150
		Negative		―		95		―	120	―	150
7	Load Regulation/mV	Positive	No load to full	―		95		―	120	―	150
		Negative		―		95		―	120	―	150
8	Input current/mA	Inhibited		―		10		―	10	―	10
		Io=no load		―		100		―	100	―	100
9	Input Ripple current/mA	BW≤20MHz，Full load		―		200		―	200	―	200
10	Efficiency/%	Full load	Ambient		89	-	88		―	90	―
			Low/high		86	―	86		―	86	―
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			-		15		-	15	-	15
17	Capacitive load/μF	Tc=25℃		―		500		―	500	―	500
18	Switching frequency/kHz	Full load		250		350		250	350	250	350
19	Cross regulation/mV	One side 30% load, the other from 30% to 70% load		―		380		―	480	―	600
20	Step Load Response Transient(mV pK)	50%load→full load or Full load →50% load		―		800		―	800	―	800
21	Step Load Response Recovery(μs)	50%load→full load or Full load →50% load		―		800		―	600	―	600
22	Step Line Response Transient(mV pK)	VIN：16V→40V， VIN：40V→16V，Io=Full load		―		1200		―	1200	―	1200
23	Step Line Response Recovery(μs)	VIN：16V→40V， VIN：40V→16V，Io=Full load		―		1500		―	1500	―	1500
24	Start-up Overshoot(mV pK)	VIN：0→28V， Io=Full load		―		25		―	25	―	25
25	Start-up Delay (ms)	VIN：0→28V， Io=Full load		―		30		―	20	―	20

Table 3-2 Electric characteristics

No.	Parameter	Conditions （Unless other wise，-55℃≤Tc≤125℃，VIN=28V±5%）			HOL28D16R5			HOL28DXX		HOL28DXX
					Min		Max	Min	Max	Min	Max
1	Input voltage/V	Low、High、Ambient Temperature			20		36
2	Output voltage/V	Positive	16.25 -16.75		16.25		16.25
		Negative			-16.75		-16.75
		Positive	16.25 -16.75		16.25		16.25
		Negative			-16.75		-16.75
3	Output current/A				―		3.5
4	Output Power/W				―		115
5	Output Ripple Voltage/mV	BW≤20MHz，Full load			―		150
6	Line Regulation/mV	Positive	VIN=16V～40V，Full load		―		165
		Negative			―		165
7	Lode Regulation/mV	Positive	No load to full		―		165
		Negative			―		165
8	Input current/mA	Inhibited			―		10
		Io=no load			―		100
9	Input Ripple current/mA	BW≤20MHz，Full load		―		200
10	Efficiency/%	Full load			87		-
					86		-
11	Isolation/MΩ	Input to output or any pin to case at 500V，Tc=25℃			100		-
12	Inhibit voltage				0		0.7
13	Inhibit open circuit voltage/V	Full load			1.25		4.0
14	Under voltage open voltage/V	Full load			18		19.5
15	Under voltage cut-off voltage/V	Full load			17		19
16	Short Circuit Protection				―		15
17	Capacitive load/μF	Tc=25℃			―		330
18	Switching frequency/kHz	Full load			250		350
19	Cross regulation/mV	One side 30% load, the other from 30% to 70% load			―		800
20	Step Load Response Transient(mV pK)	50%load→full load or Full load →50% load			―		800
21	Step Load Response Recovery(μs)	50%load→full load or Full load →50% load			―		600
22	Step Line Response Transient(mV pK)	VIN：16V→40V， VIN：40V→16V，Io=Full load			―		1200
23	Step Line Response Recovery(μs)	VIN：16V→40V， VIN：40V→16V，Io=Full load			―		1500
24	Start-up Overshoot(mV pK)	VIN：0→28V， Io=Full load			―		150
25	Start-up Delay (ms)	VIN：0→28V， Io=Full load			―		50

5. Circuit block diagram of HOL28D Series Thick Film DC to DC Converter

Fig 1 HOL28D Series circuit block diagram

6. Typical Performance Curves of HOL28D Series Thick Film DC to DC Converter(Testing condition as per Tc=25℃，VIN=28V±5%, Full load, unless otherwise specified)

Fig 2 HOL28D15 Efficiency curves

Fig 3 HOL28D15Input Step Curve

Fig 4 HOL28D15 Step Load Response（Positive output）

Fig 5 HOL28D15 Start-up Overshoot/Start-up Delay

7 MTBF Curves of HOL28D Series Thick Film DC to DC Converter

Fig 6 MTBF Temperature Curves（HOL28D15）

（Well ground condition）

8 Pin Designations of HOL28D Series Thick Film DC-DC Converter

Fig 7 Pin Out Bottom View

Pin Designation

Pin	Symbol	Designation	Pin	Symbol	Designation
1	VIN	Positive input	8	Vo+	Positive output
2	GNDI	Input ground	9	COM	Common
3	NC	NC	10	Vo-	Negative output
4	INH1	Primary Inhibit	11	Trim	Trimming
5	NC	NC	12	SHARE	Current flow control terminal
6	SYNI	Synchronous input	13	NC	NC
7	NC	NC	14	NC	NC

Notes：HOL28D15、HOL28D16R5（This two models using this package type）

Fig 8 Pin out Bottom View

Pin Designation

Pin	Symbol	Designation	Pin	Symbol	Designation
1	VIN	Positive input	7	Vo+	Positive output
2	GNDI	Input ground	8	COM	Common
3	NC	NC	9	Vo-	Negative output
4	INH1	Primary Inhibit	10	Trim	Trimming
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 HOL28D Series Thick Film DC DC Converter

Fig 9 Products Using Connection Diagram

Fig 10 EMI Filter Connection Diagram

10 Package Specifications of HOL28D Series Thick Film DC DC Converter

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	-	4.00	-
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

(4J42)

Oxygen-free copper

Parallel seam welding

11. Ordering information of HOL28D Series Thick Film Hybrid Large Power DC-DC Converter

Fig 13 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 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 : 15.5V～41V DC-DC Converters Double DC-DC Converters miliatary grade DC-DC Converter

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Subject : 150W Thick Film DC-DC Converters

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Product Detail

1. Features of HOL28D Series Thick Film DC-DC Converter

2. Scope of application of HOL28D Series Thick Film DC-DC Converter

3. Description of HOL28D Series Thick Film DC-DC Converter

4. Electrical performance of HOL28D Series Thick Film DC-DC Converter

5. Circuit block diagram of HOL28D Series Thick Film DC to DC Converter

7 MTBF Curves of HOL28D Series Thick Film DC to DC Converter

8 Pin Designations of HOL28D Series Thick Film DC-DC Converter

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150W Thick Film DC-DC Converters

Sales 150W Thick Film DC-DC Converters

Product Detail

1. Features of HOL28D Series Thick Film DC-DC Converter

2. Scope of application of HOL28D Series Thick Film DC-DC Converter

3. Description of HOL28D Series Thick Film DC-DC Converter

4. Electrical performance of HOL28D Series Thick Film DC-DC Converter

5. Circuit block diagram of HOL28D Series Thick Film DC to DC Converter

7 MTBF Curves of HOL28D Series Thick Film DC to DC Converter

8 Pin Designations of HOL28D Series Thick Film DC-DC Converter

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