ECRI Microelectronics

HHF28 Series Aerospace DC-DC Converter

1 FEATURES of HHF28 Series High Reliability  DC/DC Converters

• 16 to 40 VDC input, typical 28V 
         
• 15W output power 
• -55℃ to+125℃ operation 
• Fully isolated 
• More than100MΩ(500V DC) isolation
• Inhibit function and indefinite short circuit protection
• High Power Density: 28 W/in3
• Equivalent with Interpoint’s MHF Series
• Hermetically sealed metal cases

MODELS

SINGLE

DUAL

HHF28S3R3(F)

HHF28S5(F)

HHF28S5R2(F)

HHF28S12(F)

HHF28S15(F)

HHF28S28(F)

HHF28S08(F)

HHF28D5(F)

HHF28D12(F)

HHF28D15(F)

HHF28D5N

HHF28D6N

HHF28D12N

HHF28D15N


2 DESCRIPTION of HHF28 SeriesAerospace DC-DC Converter

The HHF28 Series of DC-DC converter offer up to 15 watts of output power with high reliability. The HHF28 series’ small size, light weight, and hermetically sealed metal packages make them ideal for use in aviation aerospace and other high reliability applications.
The HHF 28 series of converter use forward pulse width modulated 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 double close loop control can create constant voltage output and short circuit protection. The magnetic feedback technology can effectively prevent the magnetic saturation of transformer and also products reliability can be improved.
Thick film hybrid techniques provide the HHF28 Series of converter with reliability levels and optimum miniaturization. The design and manufacturing process of HHF28 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 HHF Series of converter can achieve better electromagnetic compatibility (EMC) performance.

3 ELECTRICAL PERFORMANCE of HHF28 Series Aerospace DC-DC Converter

ABSOLUTE MAXIMUM RATINGS
• Input Voltage: 16~44
• Power dissipation: 6W
• Lead Soldering Temperature : 300°C (10 sec per lead)
• Storage Temperature Range (Case): -55℃ ~ +125℃
• Inhibit voltage: ≤0.2V
• Outside Sync. Signal:
Frequency Range: 450~600kHz
Duty Cycle:40%~60%
TTL: 0.8≤V≤4.5V

RECOMMENDED OPERATING CONDITIONS
• DC Input voltage range :16~ 40V HF28S5(F) HHF28S12(F) HHF28S15(F)

Table 2  Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = +28V ± 0.5V, Full Load5, Unless Otherwise Specified)
Single output models HHF28S5(F) HHF28S12(F) HHF28S15(F)
Parameter Conditions Min Max Min Max Min Max
Output Voltage (V) Io=full
load
Ambient temperature 4.95 5.05 11.88 12.12 14.85 15.15
high and low temperature 4.85 5.15 11.76 12.24 14.7 15.3
Output Current(A)t VIN = 16 TO 40 VDC - 2.4 - 1.25 - 1
Output Power(W) - - 12 - 15 - 15
Output Ripple Voltage
(mV)
BW=10 kHz  to 2 MHz Ambient temperature - 80 - 80 - 80
Io=full load high and low temperature - 100 - 120 - 120
Line Regulation(mV) VIN = 16 TO 40 VDC,Io=full load - 50 - 50 - 50
Load Regulation(mV) Io=No load to load - 50 - 50 - 50
Input Ripple Current(mA) BW=10kHz-2MHz Ambient temperature - 80 - 80 80-
Io=full load high and low temperature - 100 - 120 - 120
Efficiency (%) Io=full load Ambient temperature 75 - 76 - 78 -
high and low temperature 72 - 74 - 74 -
Isolation  (MΩ) Input to output or any pin to case (except case ground pin) at 500 VDC, TA = 25° C 100 - 100 - 100 -
Inhibit Function TA = 25° C,Inhibit voltage, output disabled have have have
Protection Function TA = 25° C
Start-up Overshoot mV pk Vin=0 to 28V, Io=full load - 600 - 1200 - 1500
Start-up Delay(ms) Vin=0 to 28V, Io=full load - 25 - 25 - 25
Capacitive Load(µF) TA = 25° C, No effect on DC performance - 300 - 100 - 100
Switching Frequency(kHz) Io=full load 400 600 400 600 400 600
Step Load Response Transient(mV pK) 50% load -- full load -50% load -400 400 -500 500 -600 600
Step Load Response 50% load -- full load -50% load - 300 - 300 - 300
Recovery t  (µs)
Step Line Response Transient (mV pK) Vin=16~40V, Io=full load
Vin=40~16V, Io=full load
-800 800 -800 800 -800 800
Step Line Response Vin=16~40V, Io=full load
Vin=40~16V, Io=full load
- 1200 - 1200 - 1200
Recovery t  (µs )
Load  Fault  Short Circuit recovery (ms) short circuit to full load - 30 - 30 - 30

Notes to Specifications:
  • The step load transition time should be greater than or equal to 10μs.
  • The step line transition time should be greater than or equal to 10μs.
  • Recovery time is measured from application of the transient to point at which VOUT is within 1% of VOUT at final value.
HHF28S3R3(F) , HHF28S5R2(F)

Table 3  Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = +28V ± 0.5V, Full Load5, Unless Otherwise Specified)
Single output models HHF28S3R3(F) HHF28S5R2(F)
Parameter Conditions Min Max Min Max
Output Voltage
(V)
Io=full Ambient temperature 3.2 3.4 5.15 5.25
load high and low temperature 3.1 3.5 5.04 5.36
Output Current(A)t - - 2.4 - 2.4
Output Power(W) - - 8 - 12
Output Ripple Voltage
(mV)
BW=10 kHz to2 MHz(BW≤20MHz)Io=full load Ambient temperature - 80 - 50
high and low temperature - 240 - 100
Line Regulation
(mV)
VIN = 16 TO 40 VDC,( VIN = 10 TO 20 VDC)
Io=full load
- 100 - 50
Load Regulation(mV) Io=No load to load - 50 - 50
Input Ripple Current
(mA)
BW=10kHz-2MHz,
Io=full load
Ambient temperature
high and low temperature
Efficiency
(%)
Io=full load Ambient temperature 70 - 75 -
high and low temperature 67 - 72 -
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 have have
Protection Function TA = 25° C
Start-up Overshoot mV pk Vin=16 to 40V, Io=full load - 300 - 600
Start-up Delay
(ms)
Vin=16 to 40V, Io=full load - 25 - 25
Capacitive Load(µF) TA = 25° C, No effect on DC performance - 300 - 300
Switching Frequency(kHz) Io=full load 400 600 400 600
Step Load Response Transient(mV pK) 50% load -- full load -50% load -400 400 -400 400
Step Load Response
Recovery t  (µs)
50% load -- full load -50% load - 300 - 300
Step Line Response Transient (mV pK) Vin=16~40V, Io=full load
Vin=40~16V, Io=full load
-800 800 -800 800
Step Line Response
Recovery t  (µs )
Vin=16~40V, Io=full load
Vin=40~16V, Io=full load
- 1200 - 1200
Load  Fault  Short Circuit recovery (ms) short circuit to full load - 30 - 30

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

HHF28S28(F),  HHF28S08F
Table4  Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = +28V ± 0.5V)
Single output models HHF28S28(F) HHF28S08F
Parameter Conditions Min Max Min Max
Output Voltage Io=full Ambient temperature 27.72 28.28 7.9 8.1
(V) load high and low temperature 7.8 8.2
Output Current(A)t - 0 0.54 - 2
Output Power(W) - - 15 - -
Output Ripple Voltage BW=10 kHz to2 MHz(BW≤20MHz)Io=full load Ambient temperature - 120 - 30
(mV) high and low temperature
Line Regulation VIN = 16 TO 40 VDC,( VIN = 10 TO 20 VDC) - 180 - 0.2(%)
(mV) Io=full load
Load Regulation(mV) Io=No load to load - 180 - 0.5(%)
Input Ripple Current BW=10kHz-2MHz, Ambient temperature - - - -
(mA) Io=full load high and low temperature
Efficiency Io=full load Ambient temperature 78 - 75 -
(%) high and low temperature
Isolation Input to output or any pin to case (except case ground pin) at 500 VDC, TA = 25° C 100 - 100 -
(MΩ)
Inhibit Function TA = 25° C,Inhibit voltage, output disabled have have
Protection Function TA = 25° C
Start-up Overshoot mV pk Vin=16 to 40V, Io=full load - 1200 - 1200
Start-up Delay Vin=16 to 40V, Io=full load - 25 - 100
(ms)
Capacitive Load(µF) TA = 25° C, No effect on DC performance - 470 - -
Switching Frequency(kHz) Io=full load 375 525 - -
Step Load Response Transient(mV pK) 50% load -- full load -50% load - - - -
Step Load Response 50% load -- full load -50% load - - - -
Recovery t  (µs)
Step Line Response Transient (mV pK) Vin=16~40V, Io=full load - - - -
Vin=40~16V, Io=full load
Step Line Response Vin=16~40V, Io=full load - - - -
Recovery t  (µs ) Vin=40~16V, Io=full load
Load  Fault  Short Circuit recovery (ms) short circuit to full load - - - -


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

HF28D5(F),  HHF28D12(F), HHF28D15(F)
Table 5 Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = 28V ± 0.5V,Full Load5, Unless Otherwise Specified)
Dual output models HHF28D5(F) HHF28D12(F) HHF28D15(F)
Parameter Conditions Min Max Min Max Min Max
Output Voltage
(V)
Io1= Io2= full
load
Ambient temperature 4.95 5.05 11.88 12.12 14.85 15.15
high and low temperature 4.85 5.15 11.76 12.24 14.7 15.3
Ambient temperature -5.08 -4.92 -12.18 -11.82 -15.23 -14.78
high and low temperature -5.18 -4.82 -12.3 -11.7 -15.38 -14.63
Output Current(A)t VIN = 16 TO 40 VDC - 1.2 - 0.625 - 0.5
Output Power(W) - - 12 - 15 - 15
Output Ripple Voltage
(mV)
BW=10kHz to 2 MHz(BW≤20MHz)
Io1= Io2= full load
Ambient temperature - 80 - 80 - 80
high and low temperature - 120 - 120 - 120
Ambient temperature - 80 - 80 - 80
high and low temperature - 120 - 120 - 120
Line Regulation(mV) VIN = 16 TO 40 VDC,
Io1= Io2= full load
+Vout - 50 - 50 - 50
-Vout - 80 - 100 - 100
Load Regulation(mV) Io1= Io2=No load to full load +Vout - 50 - 50 - 50
-Vout - 100 - 100 - 100
Efficiency (%) Io1= Io2=full load Ambient temperature 77 - 76 - 76 -
high and low temperature 75 - 74 - 74 -
Isolation
(MΩ)
Input to output or any pin to case (except case ground pin) at 500 VDC, TA = 25° C 100 - 100 - 100 -
Inhibit Function TA = 25° C,Inhibit voltage, output disabled have have have
Protection Function TA = 25° C
Start-up Overshoot mV pk Vin=0 to 28V,  Io1=Io2=full load Ambient temperature - 100 - 500 - 500
high and low temperature - 250 - 750 - 750
Ambient temperature - 100 - 500 - 500
high and low temperature - 250 - 750 - 750
Start-up Delay(ms) Vin=0 to28V,  Io1=Io2=full load - 20 - 25 - 25
Capacitive Load(µF) TA = 25° C, No effect on DC performance - 47 - 10 - 10
Switchingfrequency(kHz) Io=full load 400 600 400 600 400 600
Step Load Response Transient(mV pK) 50% load to full load or full load to  50% load, Ambient temperature -600 600 -600 600 -600 600
Each Vout has balanced load high and low temperature -700 700 -700 700
Ambient temperature -600 600 -600 600
high and low temperature -700 700 -700 700
Step Load Response
Recovery t  (µs)
50% load to full load or full load to  50% load,Each Vout has balanced load - 500 - 500 - 500
Step Line Response Transient (mV pK) Vin=16~40V,  Io1= Io2=full load -800 800 -750 750 -750 750
Step Line Response
Recovery t  (µs )
Vin=16~40V,  Io1= Io2=full load - 1200 - 1200 - 1200
Load  Fault  Short Circuit recovery (ms) Io1= Io2   short circuit to full load - 30 - 50 - 50


Notes to Specifications:

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

HHF28D5N, HHF28D6N,  HHF28D15N
Table 6  Electrical Characteristics: (TCASE = -55°C to +125°C, VIN = +28V ± 0.5V)

Dual output models

HHF28D5N

HHF28D6N

HHF28D12N

HHF28D15N

Parameter

Conditions

Min

Max

Min

Max

Min

Max

Min

Max

Output Voltage

(V)

Io1 = full load

+Vout

4.8

5.2

5.8

6.2

11.8

12.2

14.8

15.2

-Vout

-5.2

-4.8

-6.2

-5.8

-12.2

-11.8

-15.2

-14.8

Output Current(A)

-

-

2

-

2

-

1

-

0.8

-

0.2

-

0.2

-

0.2

-

0.2

Output Power(W)

-

-

11

-

13

-

14

-

15

Output Ripple Voltage(mV)

Io= full load

-

40

-

40

-

40

-

40

Line Regulation(mV)

Io= full load

-

20

-

20

-

20

-

20

Load Regulation(mV)

Io=No load to full load

-

50

-

50

-

50

-

50

Efficiency (%)

Io= full load

70

-

70

-

70

-

70

-

Isolation  (MΩ)

Input to output or any pin to case (except case ground pin) at 500 VDC, TA = 25°C

100

-

100

-

100

-

100

-

Inhibit Function

TA = 25°C,Inhibit voltage (0~0.2V), output disabled

have

have

have

have

Protection Function

TA = 25°C


4 TYPICAL PERFORMANCE CURVES of HHF28 Series Aerospace DC-DC Converter

(1) Single output model HHF28S15


Figure 2   Efficiency (OUTPUT POWER)
Figure 3  STEP LINE RESPONSE


Figure 4   STEP LOAD RESPONSE
Figure 5   Start-up overshoot/ delay

(2) Dual output model HHF28D5


Figure 6  Efficiency (OUTPUT POWER)
Figure 7  STEP LINE RESPONSE


Figure 8   STEP LOAD RESPONSE
Figure 9  Start-up overshoot/ delay

5 TYPICAL MTBF CURVES of HHF28 Series Aerospace DC DC Converter



TEMPERATURE (℃)
Figure10   Model HHF28S15
TEMPERATURE (℃)
Figure 11  Model HHF28D15

6 TYPICAL CONNECTION DIAGRAM of HHF28 SeriesAerospace DC DC Converter


Figure12 Application Connection Diagram for Single output models
Figure13  Application Connection Diagram for Dual output models


Figure14 Inhibit Drive connection Diagram for Dual Output Models
Figure15  Dual Output Converter with EMI Filter Connection Diagram


7 PACKAGE SPECIFICATIONS of HHF28 Series Aerospace DC DC Converter




Figure16 Non-flanged outline
Figure17 Flanged outline

Table 7  Package Outline

Notes:
  • Character “A” is 8.6 mm for HHF15S5, HHF28S3R3 and HHF28S2R5.
  • Character “A” is 10 mm for HHF28S5 and HHF28S2R5-A
Table 8   Case Materials
Case Model
Header
Header Plating
Cover
Cover Plating
Pin
Pin Plating
Sealing Style
Notes
UPP32727-08f
Cold Rolled Steel(10#)
Nickel
Iron/Nickel Alloy(4J42)
Nickel
Copper
Compound
Nickel/Gold
Compression Seal
Nickel plating is for pin6.

Notes:
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin.

8 PIN DESIGNATION of HHF28 Series Aerospace DC to DC Converter



Figure18   Pin Out Bottom View of
non-flanged outline
Figure19   Pin Out Bottom View of
flanged outline


Notes:
  • Pin 2 of HHF28S28(F)is for output.
  • Pin3 of HHF28S28 (F) can supply 14V output.
  • Pin4 of HHF28S28 (F) is for output common.
  • Pin 5 of HHF28S08 (F) is for no connection.

9 ORDERING INFORMATION of HHF28 Series Aerospace DC toDC Converter


Figure 20  Part Numbering Key
Application Notes:
  • The correct power supply is to be ensured that may not cause permanent damage to the device.
  • When the electrical performance is tested, the testing position should be pin of the device.
  • When the device is mounted, the bottom of the device should be closely attached to the circuit board. So as to avoid the damage of the pins, the shockproof should be increased when it is required
  • When the case temperature is at 105℃,  it is suggested that thickness of the thermal sinking plate is 5mm, the dimension is greater than 120mm×100mm.
  • When the case temperature is at 125℃,  it is suggested that thickness of the thermal sinking plate is 5mm, the dimension is greater than 120mm×100mm.
  • The pin should not be bending to avoid the glass insulator broken and cause the leakage.

To request a quotation or place orders please contact our sales representative or the ECRIM Sales Department at:
Sales Phone: (086) 0551-3667943      Sales Fax: (086) 0551-3638101
E-mail: sales@ecrim.cn
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