ECRI Microelectronics

HFL28 Series Military DC-DC Converters

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


③  Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value.

3 TYPICAL PERFORMANCE CURVES of HFL28 Series Military DC DC Converter

(1) Single output model (HFL28S15F)
Efficiency (OUTPUT POWER) STEP LINE RESPONSE
Figure 2  Efficiency (OUTPUT POWER)
Figure 3  STEP LINE RESPONSE
STEP LOAD RESPONSE  START-UP OVERSHOOT/ DELAY
Figure 4   STEP LOAD RESPONSE
Figure 5   START-UP OVERSHOOT/ DELAY

(2) Dual output model (HFL28D15)
 EFFICIENCY(OUTPUT POWER) STEP LINE RESPONSE
Figure 6  EFFICIENCY(OUTPUT POWER)
Figure 7  STEP LINE RESPONSE
STEP LOAD RESPONSE START-UP ERSHOOT/DELAY
Figure 8   STEP LOAD RESPONSE
Figure 9   START-UP ERSHOOT/DELAY

4 ORDERING INFORMATION of HFL28 Series Military DC to DC Converter

ORDERING INFORMATION


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