1. Features (for outside view, see Fig. 1)

It can be used interchangeably with SA04 of APEX company.
20A current continuous output
Thermal protection and programmable external current-limiting protection
Analog and digital input
Synchronous or external oscillator
Flexible frequency control

2. Scope of application of HSA04 Series Military PWM Amplifiers

3. Description of HSA04 Series Military PWMA

4. Electrical performance (Table 1, Table2) of HSA04 Series Military Pulse Width Modulation Amplifiers

5. Operating principle (Fig. 2) of HSA04 Series Military Pulse Width Modulation Amplifiers

8. Connection diagram for typical application of HSA04 Series Military Pulse Width Modulation Amplifiers

HSA04 has two current sampling terminals I and I, when adopting voltage mode control, these two terminals should be short-circuited, the typical connection diagram is shown as in Fig. 5; while adopting current control, they should be connected to sampling resistance and the sampling resistance should choose non-inductive resistance, the typical connection diagram is shown as in Fig. 2.

(1) Bypass of power supply

HSA04 power supply shall have adequate bypass to ensure it runs properly, otherwise, it may be unstable and its efficiency may be reduced and output may oscillate. Vs power supply shall be added with at least 1µF ceramic capacitance, then connected with a bypass capacitance of a low ESR value in parallel, its magnitude shall select 10µF/A at least; for Vcc power supply, it shall also be connected with a 0.1~0.47µF ceramic capacitance in parallel and a 6.8~10µF bypass capacitance of a low ESR value.

(2) Overcurrent protection technology

typical connected diagram under voltage mode is shown as fig 6.

9. Outside view and dimensions of package (unit: mm)(Fig. 7, Table 4) of HSA04 Series Military Pulse Width Modulation Amplifiers

Application notes

• Switch on power supply correctly, during the power-up, accurately connect the positive and negative poles of power to avoid burnout.
• When carrying out the electrical performance test, the test position shall be the pinouts of the product.
• During the assembly, shockproof measures shall be added in order to avoid pin damage, if necessary.
• Do not bend the pinouts to prevent the insulator from breaking, which affect the sealing property.
• The circuit shall be added with heat sinking device, and the size of radiator depends upon the dissipation power.
• When the user places an order for the product, detailed electric performance indexes shall refer to the relevant enterprise standard.