FEATURES of HTR28 Series High Reliability DC/DC Converters

• 16 to 40 VDC input, typical 28V

• 30W output power

• -55℃ to+125℃ operation

• Fully isolated

• 100MΩminimum (500V DC) isolation

• Inhibit and indefinite short circuit protection Size: 53.98×28.58×10.16mm3(non-flanged)

73.91×28.58×10.16mm3(flanged)

• 30W/in3 power density Triple Output Models:

49.53×34.29×10.29mm3(non-flanged)

69.09×34.29×10.29mm3 (flanged)

• Equivalent with Interpoint’s MTR Series Weight: 52 grams (non-flanged)

60 grams (flanged)

• Hermetically sealed meatal cases Figure 1 HTR28 series DC/DC converters

Table 1 Product models

MODELS

SINGLE DUAL TRIPLE

HTR28S5(F) HTR28D5(F) HTR28T512(F)

HTR28S12(F) HTR28D12(F) HTR28T515(F)

HTR28S15(F) HTR28D15(F) HTR28T515-A

HTR28S3R3 HTR28T515-B

HTR28S18(F)

2 DESCRIPTION of HTR28 Series High Reliability DC/DC Converters

The HTR28 Series of DC/DC converters offer up to 30 watts of output power with high reliability. The dc dc converter module is packaged in hermetically sealed metal cases, making them ideal for use in aviation, aerospace and other high reliability applications.

The HTR 28 series of converters use a single ended, pulse width modulated and transformer magnetic feedback 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 create constant voltage output and short circuit protection.

Thick film hybrid techniques provide the HTR 28 Series of converters with reliability levels and optimum miniaturazation.The design and manufacturing process of HTR 28 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 HTR 28 Series of converters can achieve better electromagnetic compatibility(EMC) performance.

3 ELECTRICAL PERFORMANCE of HTR28 Series High Reliability DC/DC Converters

ABSOLUTE MAXIMUM RATINGS

• Input Voltage: 16 to 40 VDC

• Power Dissipation: 30 watts

• Lead Soldering Temperature:300℃(10s)

• Storage Temperature Range: -55℃ to+125℃

• Inhibit Voltage: 0.2V max

• External Synchronous Signals:

Frequency Range: 450k to 600kHz

Duty Ratio: 40% to 60%

Level: 0.8 V≤V≤4.5V

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