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The HFL28 Series of military grade DC-DC converters offer up to 65 watts of output power with high reliability. The converters are packaged in hermetically sealed metal cases, making them ideal for use in aviation, aerospace and other high reliability applications.

Single/Double/Triple : Single
Output Voltage (V) : 5V,12V,15V,28V
Max. Output Power (W) : 65W

Product Detail

1 FEATURES of HFL28 Series High Reliability DC/DC Converters

16 to 40 VDC input, typical 28V
50W to 65W output power
-55℃ to +125℃ operation
Fully isolated
100MΩminimum (500V DC) isolation
Inhibit and indefinite short circuit protection
43W/in3 power density
Equivalent with Interpoint’s MFL Series
Hermetically sealed meatal cases

2 DESCRIPTION of HFL28 Series Military DC-DC Converter

The HFL28 Series of DC-DC converters offer up to 65 watts of output power with high reliability. The converters are packaged in hermetically sealed metal cases, making them ideal for use in aviation, aerospace and other high reliability applications.

The HFL28 series of converters use a pulse width modulated and single ended forward topology design. The 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 magnetic feedback technology can avoid magnetic saturation and improve products reliability effectively.

Thick film hybrid techniques provide the HFL 28 Series of mil-grade DC/DC converter with reliability levels and optimum miniaturazation.The design and manufacturing process of HFL28 Series of converters are in compliance with General Standards of Hybrid Integrated Circuits and detailed standards of manufacturing. Connected to a HFD-CE03 filter, the HFL28 Series of converters can achieve better electromagnetic compatibility(EMC) performance.

ABSOLUTE MAXIMUM RATINGS	MODELS
• Input Voltage: 16 to 40 VDC	SINGLE	DUAL
• Power Dissipation: 65 watts	HFL28S5	HFL28D5
• Lead Soldering Temperature:300℃(10s)	HFL28S12	HFL28D12
• Storage Temperature Range: -55℃ to +125℃	HFL28S15	HFL28D15
• Inhibit Voltage: 0.2V max	HFL28S28
• External Synchronous Signals: Frequency Range: 400k to 600kHz Duty Ratio: 40% to 60% Level: 0.8 V≤V≤5V	Table 1 Product models

Table 2 Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = 28V ± 0.5V, Full Load5, Unless Otherwise Specified)
Notes to Specifications:

Single output models			HFL28S5		HFL28S12
Parameter	Conditions		Min	Max	Min	Max
Output Voltage(V)	Io=full load	Ambient temperature	4.95	5.05	11.88	12.12
		high and low temperature	4.875	5.125	11.76	12.24
Output Current(A)	Vin = 16 TO 40 VDC		—	10	—	5
Output Power(W)	—		—	50	—	60
Output Ripple Voltage (mV)	BW=10 kHz to 2 MHz Io=full load	Ambient temperature	—	35	—	75
		high and low temperature	—	50	—	100
Line Regulation(mV)	Vin = 16 TO 40 VDC,Io=full load		—	20	—	20
Load Regulation(mV)	Io=No load to load		—	20	—	20
Input Ripple Current (mA)	BW=10 kHz to 10 MHz Io=full load	Ambient temperature	—	45	—	45
		high and low temperature	—	50	—	50
Efficiency (%)	Io=full load	Ambient temperature	77	—	83	—
		high and low temperature	75	—	81	—
Isolation (MΩ)	Input to output or any pin to case (except case ground pin) at 500 VDC, TA = 25° C		100	—	100	—
Inhibit Function	TA = 25° C，Inhibit voltage, output disabled		0	0.2	0	0.2
Protection Function	TA = 25° C		5	—	5	—
Start-up Overshoot(mV pk)	Vin=0 to 28V, Io=full load		—	25	—	50
Start-up Delay(ms)	Vin=0 to 28V, Io=full load		—	6	—	6
Capacitive Load(μF)	TA = 25° C, No effect on DC performance		—	1000	—	1000
Switching Frequency(kHz)	Io=full load		400	600	400	600
Step Load Response Transient (mV pK)	50% load -- full load -50% load		-350	350	—	600
Step Load Response	50% load -- full load -50% load		—	3000	—	3000

Recovery (µs)
Step Line Response Transient (mV pK)	Vin=16~40V, Io=full load，		—	300	—	400
	Vin=40~16V, Io=full load
Step Line Response Recovery (µs )	Vin=16~40V, Io=full load，		—	300	—	300
	Vin=40~16V, Io=full load
Load Fault recovery (ms)	IO:short circuit to full load		—	4	—	4

① The step load transition time should be greater than or equal to 10µs.
② The step line transition time should be greater than or equal to 10µs.
③ Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value.

HFL28S15, HFL28S28
Table 3 Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = 28V ± 0.5V, Full Load5, Unless Otherwise Specified)

Notes to Specifications:

① The step load transition time should be greater than or equal to 10µs.
② The step line transition time should be greater than or equal to 10µs.

Single output models			HFL28S15		HFL28S28
Parameter	Conditions		Min	Max	Min	Max
Output Voltage (V)	Io=full load	Ambient temperature high and low temperature	14.85 14.55	15.15 15.45	27.72 27.16	28.28 28.84
Output Current(A)	Vin= 16 TO 40 VDC		—	4.33	—	2.32
Output Power(W)	—		—	65	—	65
Output Ripple Voltage(mV)	BW=10 kHz to 2 MHz Io=full load	Ambient temperature high and low temperature	— —	85 110	— —	200 300
Line Regulation(mV)	Vin = 16 TO 40 VDC,Io=full load		—	20	—	120
Load Regulation(mV)	Io=No load to load		—	20	—	150
Input Ripple Current (mA)	BW=10 kHz to 10 MHz Io=full load	Ambient temperature high and low temperature	— —	45 50	— —	50 60
Efficiency (%)	Io=full load	Ambient temperature high and low temperature	84 82	— —	83 79	— —
Isolation (MΩ)	Input to output or any pin to case (except case ground pin) at 500 VDC, TA = 25°C		100	—	100	—
Inhibit Function	TA = 25°C，Inhibit voltage, output disabled		0	0.2	0	0.2
Protection Function	TA = 25°C		5	—	5	—
Start-up Overshoot (mV pk)	Vin=0 to 28V, Io=full load		—	50	—	100
Start-up Delay(ms)	Vin=0 to 28V, Io=full load		—	6	—	6
Capacitive Load(μF)	TA = 25°C, No effect on DC performance		—	1000	—	500
Switching Frequency(kHz)	Io=full load		400	600	400	600
Step Load Response Transient (mV pK)	50% load -- full load -50% load		—	600	—	1400
Step Load Response Recovery (µs)	50% load -- full load -50% load		—	3000	—	3000
Step Line Response Transient (mV pK)	Vin=16~40V, Io=full load， Vin=40~16V, Io=full load		—	400	—	800
Step Line Response Recovery (µs )	Vin=16~40V, Io=full load， Vin=40~16V, Io=full load		—	300	—	400
Load Fault recovery (ms)	IO:short circuit to full load		—	4	—	4