CN207637789U - Three-chip type built-in condenser synchronous rectification diode - Google Patents

Abstract

The utility model discloses a three-piece built-in capacitive synchronous rectification diode, comprising a first frame, a MOSFET chip, a control IC chip, a second frame, and a built-in capacitor. The second frame has an external pin, and the second frame has a There is a third frame on the side, the control IC chip is fixed on the second frame, the external wiring segment of the built-in capacitor is connected to the second frame, and the internal terminal is connected to the third frame; the first frame has an external pin, and the MOSFET chip is fixed On the first frame; between the MOSFET chip and the control IC chip, between the control IC chip and the third frame, between the MOSFET chip and the second frame, between the control IC chip and the first frame through bonding wires . The three-chip built-in capacitive synchronous rectification diode optimizes the structure, integrates the available area of the PAD, and eliminates structural defects that may cause defects.

Description

Three-chip built-in capacitive synchronous rectifier diode

technical field

The utility model relates to the field of chip production, in particular to a three-chip built-in capacitive synchronous rectifier diode.

Background technique

The structural principle of the Schottky rectifier is very different from that of the PN junction rectifier. Usually, the PN junction rectifier is called a junction rectifier, and the metal-semiconductor rectifier is called a Schottky rectifier. The existing rectification element Schottky diode has the problem of large rectification loss and low conversion efficiency.

Synchronous rectification diode is composed of control IC, power MOSFET and its auxiliary circuit, so as to realize the new technology of low loss rectification. The existing synchronous rectification structural components are clumsy and inconvenient, large in size, difficult to dissipate heat, and thin and repetitive pins, which cause certain troubles for installation and use.

Utility model content

In order to solve the deficiencies of the prior art, the utility model proposes a three-chip built-in capacitive synchronous rectifier diode, which optimizes the structure, integrates the available area of the PAD, and eliminates the structural defects that are likely to cause defects.

The utility model adopts the following technical solutions:

Three-piece built-in capacitive synchronous rectification diode, including a first frame, a MOSFET chip, a control IC chip, a second frame, and a built-in capacitor. The second frame has an external pin, and a third frame is provided on one side of the second frame. Frame, the control IC chip is fixed on the second frame, the external wiring segment of the built-in capacitor is connected to the second frame, and the internal terminal is connected to the third frame; the first frame is provided with an external pin, and the MOSFET chip is fixed on the first frame ; between the MOSFET chip and the control IC chip, between the control IC chip and the third frame, between the MOSFET chip and the second frame, and between the control IC chip and the first frame through bonding wires.

Further, the built-in capacitor is an MLCC capacitor.

Further, the first frame and the second frame are copper alloy frames.

Further, the first frame, the MOSFET chip, the control IC chip, the second frame, and the built-in capacitor are welded and molded by bonding wires, and then packaged in a plastic package to form an integral synchronous rectification diode.

Furthermore, the external pin of the first frame is the cathode of the synchronous rectification diode, and the external pin of the second frame is the anode of the synchronous rectification diode.

The beneficial technical effect obtained by adopting the above technical scheme is:

Complying with the development trend of thinner, smaller and surface-mounted semiconductor rectifier devices, the compact synchronous rectification structure and its manufacturing method developed by this utility model eliminate structural defects that are likely to cause defects through component integration and optimization of the structure. The purpose of reducing the size of components, simplifying the installation process, and improving heat dissipation is achieved, so the synchronous rectification structure has great advantages.

The three-piece built-in capacitive synchronous rectification diode optimizes the structure and integrates the available area of the PAD (the area where the pads in the PCB or printed circuit board are placed), eliminating structural defects that are likely to cause defects.

Description of drawings

Figure 1 is a schematic diagram of the structure of a three-chip built-in capacitive synchronous rectifier diode.

Fig. 2 is a schematic diagram of the manufacturing process of the three-piece built-in capacitive synchronous rectifier diode.

Figure 3 is a schematic diagram of the package of a three-piece built-in capacitive synchronous rectifier diode product.

Figure 4 is a schematic diagram of the internal control of the three-chip built-in capacitive synchronous rectifier diode product.

Fig. 5 is the application circuit diagram of the forward rectification of the utility model.

Fig. 6 is a circuit diagram of a reverse rectification application of the utility model.

In the figure, 1. first frame; 2. MOSFET chip; 3. control IC chip; 4. second frame; 5. built-in capacitor; 6. third frame.

Detailed ways

The specific embodiment of the utility model is further described in conjunction with accompanying drawing 1 to 6:

Example 1:

As shown in Figure 1, the three-piece built-in capacitive synchronous rectification diode includes a first frame 1, a MOSFET chip 2, a control IC chip 3, a second frame 4, and a built-in capacitor 5, and the second frame has an external lead One side of the second frame is provided with a third frame, the control IC chip is fixed on the second frame, the external wiring segment of the built-in capacitor is connected to the second frame, and the internal terminal is connected to the third frame 6; the first frame is provided with an external Pins are set, and the MOSFET chip is fixed on the first frame; between the MOSFET chip and the control IC chip, between the control IC chip and the third frame, between the MOSFET chip and the second frame, between the control IC chip and the first frame connected by bonding wires.

The built-in capacitors are MLCC capacitors. The first frame and the second frame are copper alloy frames. The first frame 1, the MOSFET chip 2, the control IC chip 3, the second frame 4, the built-in capacitor 5, and the third frame 6 are welded and formed by bonding wires and packaged in a plastic package to form an integral synchronous rectification diode.

The external pin of the first frame is the cathode of the synchronous rectification diode, and the external pin of the second frame is the anode of the synchronous rectification diode.

The three-chip built-in capacitive synchronous rectifier diode simplifies the processing of the frame, and the third frame provides an open window for the capacitor to avoid contact between the frame and the external electrodes of the capacitor.

Example 2:

The three-piece built-in capacitive synchronous rectifier diode is prepared by the following process:

(1) Raw material preparation: Customize the copper alloy frames of the first frame, the second frame, and the third frame, prepare MOSFET chips, control IC chips, and built-in capacitors; inspect the appearance and electrical properties of the devices before installation to eliminate defects.

(2) Chip mounting and welding: use an automatic welding machine to combine the MOSFET chip with the first frame, control the IC chip with the second frame, combine the built-in capacitor with the internal terminal with the third frame, and the external terminal with the second frame Combined and welded into shape.

(3) Wire bonding: each device is bonded by an automatic wire bonding machine to form a circuit.

(4) Plastic sealing and molding: plastic sealing and molding of the bonded devices through a compression molding process.

(5) Electroplating and dicing: Remove residual glue, tin-plate pins (if the frame is treated with nickel-palladium-gold or nickel-gold surface, tin-plating is not required), baking, and dicing.

(6) Printing test: After the diced components are tested by the testing machine, they are printed and packed into boxes.

(7) Visual inspection: observe under a microscope, and remove bad appearance.

(8) Packaging and storage.

The three-chip built-in capacitive synchronous rectifier diode shown in Figure 3 is manufactured by the above process.

Example 3:

As described in Embodiment 1, the three-chip built-in capacitive synchronous rectification diode, the external pin of the first frame is the cathode of the synchronous rectification diode, the external pin of the second frame is the anode of the synchronous rectification diode, and the built-in capacitor is located at Between the second frame and the third frame. As shown in Figure 4, when the cathode voltage is greater than the anode, the built-in capacitor is charged to supply power to the control IC chip; when the control IC chip detects that the component terminal voltage is greater than the turn-on voltage Von, the MOSFET chip is turned on, and when the component terminal voltage is detected to be zero , turn off the MOSFET chip.

Example 4:

Three-chip built-in capacitive synchronous rectification diodes are used in forward rectification and reverse rectification applications as shown in Figure 5 and Figure 6. In the application of forward rectification, the AC input first passes through the bridge rectifier circuit, and then is filtered and pulse width modulated, and transformed by the transformer. connected to the load. In the application of reverse rectification, the AC input first passes through the bridge rectifier circuit, then filtered, pulse width modulated, and then transformed by the transformer. connected to the load.

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that any person skilled in the art can make all the Equivalent substitutions and obvious deformation forms all fall within the essential scope of this specification and should be protected by the utility model.

Claims (5)

1. three-chip type built-in condenser synchronous rectification diode, which is characterized in that including the first frame (1), MOSFET chips (2), control IC chip (3), the second frame (4), built-in capacitance (5), second frame (4) is there are one external pin, and second Frame (4) side be equipped with third frame (6), control IC chip (3) be fixed on the second frame (4), built-in capacitance (5) it is external Line segment connects on the second frame (4), and line end connection third frame (6) is inscribed；

First frame (1) is set there are one external pin, and MOSFET chips (2) are fixed on the first frame (1)；

Between the MOSFET chips (2) and control IC chip (3), between control IC chip (3) and third frame (6), It is connect by bonding line between MOSFET chips (2) and the second frame (4), between control IC chip (3) and the first frame (1).

2. three-chip type built-in condenser synchronous rectification diode according to claim 1, which is characterized in that the in-built electrical It is MLCC capacitances to hold (5).

3. three-chip type built-in condenser synchronous rectification diode according to claim 1, which is characterized in that first frame Frame (1), the second frame (4), third frame (6) are copper alloy frame.

4. three-chip type built-in condenser synchronous rectification diode according to claim 1, which is characterized in that first frame After frame (1), MOSFET chips (2), control IC chip (3), the second frame (4), third frame (6) are by bonding line welding fabrication It is packaged in plastic-sealed body, constitutes the synchronous rectification diode of an entirety.

5. three-chip type built-in condenser synchronous rectification diode according to claim 1, which is characterized in that first frame The external pin of frame (1) is the cathode of synchronous rectification diode, and the external pin of the second frame (4) is synchronous rectification diode Anode.