ECRI Microelectronics

HHD28 Series Mil-grade DC-DC Converter

1 FEATURES of HHD28 Series High Reliability DC/DC  Converters

  • 16 to 40 VDC input, typical 28V

  • 20W output power
  • -55℃ to+125℃ operation
  • Fully isolated
  • More than100MΩ(500V DC) isolation
  • Inhibit function and indefinite short circuit protection
  • Power Density: 28 W/in3
  • Equivalent with Interpoint’s MHD Series
  • Hermetically sealed metal cases

MODELS

SINGLE

DUAL

HHD28S5(F)

HHD28S12(F)

HHD28S15(F)

HHD28S18(F)

HHD28D5(F)

HHD28D12(F)

HHD28D15(F)



2 DESCRIPTION of HHD28 Series Mil-grade DC-DC  Converter

The HHD28 Series of DC-DC converters offer up to 20 watts of output power with high reliability. The HHD28 series’ small size, light weight, and hermetically sealed metal packages make them ideal for use in aviation aerospace and other high reliability applications.
The HHD28 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 HHD28 Series of converter with reliability levels and optimum miniaturization. The design and manufacturing process of HHD28 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 HHD Series of converters can achieve better electromagnetic compatibility (EMC) performance.

3 ELECTRICAL PERFORMANCE of HHD28 Series Mil-grade DC-DC  Converter


ABSOLUTE MAXIMUM RATINGS
  • Input Voltage: 16~40
  • 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
  • Case Operating Temperature (Tc):  –55°C to +125°C
HHD28S5(F) , HHD28S12(F)

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

Single output models

HHD28S5(F)

HHD28S12(F)

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

4.85

5.15

11.64

12.36

Output Current(A)t

VIN= 16 TO 40 VDC

-

3

-

1.67

Output Power(W)

-

-

15

-

20

Output Ripple Voltage

(mV)

BW=10 kHz to 2 MHz

Io=full load

Ambient temperature

-

50

-

40

high and low temperature

-

90

-

90

Line Regulation(mV)

VIN= 16 TO 40 VDC,Io=full load

-

50

-

50

Load Regulation(mV)

Io=No load to load

-

50

-

50

Input Ripple Current

(mA)

10 kHz - 2 MHzIo=full load

-

50

-

50

Efficiency (%)

Io=full load

Ambient temperature

76

-

80

-

high and low temperature

73

-

76

-

Isolation (MΩ)

Input to output or any pin to case (except case ground pin) at500 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=0 to 28V, Io=full load


50

-

120

Start-up Delay(ms)

Vin=0 to 28V, Io=full load

-

5

-

5

Capacitive Load(μF)

TA = 25° C, No effect on DC performance

-

10000

-

3000

Switching Frequency(kHz)

Io=full load

400

600

400

600

Step Load Response Transient(mV pK)

50% load -- full load -50% load

-300

300

-400

400

Step Load Response

Recovery (μs)

50% load -- full load -50% load

-

200

-

200

Step Line Response Transient (mV pK)

Vin=16~40V,Io=full load

Vin=40~16V, Io=full load

-300

300

-500

500

Step Line Response

Recovery t  (μs )

Vin=16~40V,Io=full load

Vin=40~16V, Io=full load

-

300

-

300

Load  Fault  Short Circuit recovery  (ms)

short circuit to full load

-

5

-

5


Notes to Specifications:
  • he step load transition time should be greater than or equal to 10μs.
  • he step line transition time should be greater than or equal to 10μs.
  • Recovery time is measured from application of the transient to point at whichVOUT is within 1% of VOUT at final value.
HHD28S15(F),  HHD28S18(F)

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

Single output models

HHD28S15(F)

HHD28S18(F)

Parameter

Conditions

Min

Max

Min

Max

Output Voltage(V)

Io=full load

Ambient temperature

14.85

15.15

17.82

18.18

high and low temperature

14.55

15.45

17.46

18.54

Output Current(A)t

VIN= 16 TO 40 VDC

-

1.33

-

1.11

Output Power(W)

-

-

20

-

20

Output Ripple Voltage

(mV)

BW=10 kHz to 2 MHz

Io=full load

Ambient temperature

-

40

-

40

high and low temperature

-

90

-

90

Line Regulation(mV)

VIN= 16 TO 40 VDC,Io=full load

-

50

-

50

Load Regulation(mV)

Io=No load to load

-

50

-

50

Input Ripple Current

(mA)

10 kHz - 2 MHzIo=full load

-

50

-

50

Efficiency (%)

Io=full load

Ambient temperature

81

-

81

-

high and low temperature

76

-

76

-

Isolation (MΩ)

Input to output or any pin to case (except case ground pin) at500 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=0 to 28V, Io=full load

-

150

-

180

Start-up Delay(ms)

Vin=0 to 28V, Io=full load

-

5

-

5

Capacitive Load(μF)

TA = 25° C, No effect on DC performance

-

3000

-

2000

Switching Frequency(kHz)

Io=full load

400

600

400

600

Step Load Response Transient(mV pK)

50% load -- full load -50% load

-500

500

-600

600

Step Load Response

Recovery (μs)

50% load -- full load -50% load

-

200

-

200

Step Line Response Transient (mV pK)

Vin=16~40V,Io=full load

Vin=40~16V, Io=full load

-600

600

-600

600

Step Line Response

Recovery t  (μs )

Vin=16~40V,Io=full load

Vin=40~16V, Io=full load

-

300

-

300

Load  Fault  Short Circuit recovery  (ms)

short circuit to full load

-

5

-

5


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 whichVOUT is within 1% of VOUT at final value.
HHD28D5,  HHD28D12(F), HHD28D15(F)
Table 4  Electrical Characteristics:(TCASE = -55°C to +125°C, VIN = 28V ±0.5V, Full Load5, Unless Otherwise Specified)

Dual output models

HHD28D5

HHD28D12(F)

HHD28D15(F)

Parameter

Conditions

Min

Max

Min

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