Assembly comprising an electric component

• US 10,637,206 B2
• Filed: 05/16/2017
• Issued: 04/28/2020
• Est. Priority Date: 05/17/2016
• Status: Active Grant

• Current Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Original Assignee: OSRAM OLED GMBH (Ams-Osram AG)
• Inventors: Halbritter, Hubert, Wojcik, Andreas
• Primary Examiner(s): Van Roy, Tod T
• Assistant Examiner(s): Forde, Delma R.
• Application Number:
  US16/302,569
• Publication Number:
  US 20190312407A1
• Time in Patent Office: 1,078 Days
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48111 the wire connector extending above another semiconductor or solid-state body
• CPC Class Codes: H01L 23/49589 Capacitor integral with or on the leadframe
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H01S 5/02216 Butterfly-type, i.e. with electrode pins extending horizontally from the housings
• CPC Class Codes: H01S 5/0232 Lead-frames
• CPC Class Codes: H01S 5/02345 Wire-bonding
• CPC Class Codes: H01S 5/0421 characterised by the semiconducting contacting layers electrodes H01S5/0425
• CPC Class Codes: H01S 5/0425 Electrodes, e.g. characterised by the structure
• CPC Class Codes: H01S 5/04256 characterised by the configuration
• CPC Class Codes: H01S 5/0427 for applying modulation to the laser

Abstract

The invention relates to an assembly comprising an electric component. The component has an electric part, a control circuit, and a capacitor. At least two lead frames are provided which are embedded into a housing. The part, the control circuit, and the capacitor are arranged on the lead frames, and the control circuit is designed to charge the capacitor and to supply the part with current from the capacitor in a clocked manner. The component has two contacts, and the component is arranged on a support. The support has an electrically conductive layer and the two contacts are connected to the layer in an electrically conductive manner. At least one first part of one lead frame is arranged at a greater distance from the electrically conductive layer than the second lead frame.

Claims

1. An arrangement having a surface-mountable electrical device and having a carrier, the surface-mountable electrical device comprising

at least one electrical component which is a semiconductor component and which is intended for generating radiation,

a control circuit for pulsed operation of the component,

a capacitor which is connected to the component electrically in series and which is configured for the pulsed energization of the component, and

a lead frame assembly as a mounting platform for the component, the capacitor and the control circuit, wherein the lead frame assembly comprises a plurality of different lead frames including at least a first lead frame, a second lead frame, and a third lead frame, and at least one of the plurality of different lead frames is thinner than at least one other of the lead frames of the plurality of different lead frames so that the lead frame assembly lies only partially in a mounting side,

wherein

the device is applied to a top side of the carrier,

a contact layer having a plurality of contact points is present on the top side, and the lead frames are electrically and mechanically connected to said contact points, and

the lead frames are partially spaced apart from the top side,

wherein a first region of the third lead frame, on which the control circuit and the capacitor are arranged, is electrically connected directly to a second region of the third lead frame via the contact layer, wherein during operation of the component both connections of the capacitor are electrically connected to one another via the component, the control circuit and the contact layer such that by means of the contact layer an inductance for a discharge current out of the capacitor is decreased and a part of the discharge current flows through the contact layer.

2. The arrangement device according to claim 1, wherein

the component is mounted on the first lead frame,

the capacitor is applied to the second lead frame by means of a first connection,

the control circuit and the capacitor are connected to a second connection on the third lead frame,

the control circuit is electrically connected directly to at least one contact surface which is formed by one of the lead frames,

the component is electrically connected directly to the second lead frame and the control circuit.

3. The arrangement according to claim 2, wherein

the second lead frame serves as an external electrical contact point for a supply voltage (V) and the third lead frame is configured as an external electrical contact point for a ground contact (GND),

at least one of the contact surfaces is configured as an exposed electrical contact point for a control voltage (T) for the control circuit, and

the component lies electrically between the capacitor and the control circuit, or the control circuit lies electrically between the component and the capacitor.

4. The arrangement according to claim 2, wherein the second and the third lead frames are L-shaped when viewed in a plan view, wherein the second lead frame lies within a rectangle spanned by the third lead frame.

5. The arrangement according to claim 2, wherein the third lead frame is the largest lead frame and the first and the third lead frames are T-shaped when viewed in a plan view, so that middle parts of the two T'"'"'s face each other, wherein the second lead frame is arranged between the first and the third lead frames on one side of the two middle parts of the T'"'"'s when viewed in a plan view.

6. The arrangement according to claim 1, further comprising a housing, wherein the housing is made of a plastic and the housing is partially located between the lead frame assembly and the mounting side, and wherein the device is a QFN device.

7. The arrangement according to claim 1, wherein during operation of the component the two connections of the capacitor are electrically connected to one another via the component, the control circuit and the lead frame so that a part of the discharge current flows within the device.

8. The arrangement according to claim 1

wherein the contact layer-which connects the first and second regions runs completely and directly on the top side,

wherein the first lead frame is spaced apart from the mounting side and has been thinned over the whole area by a thinning process, and

wherein the second lead frame, viewed in plan view, is arranged in places above the contact layer and is spaced apart from the contact layer as a result of a point-wise thinning process.

10. The arrangement according to claim 1, wherein upper sides of the lead frames facing away from the mounting side are arranged at the same height.

11. The arrangement according to claim 1,

wherein a second electrically conductive layer is arranged in the carrier,

wherein the second layer is electrically conductively connected to the first layer, and

wherein the first and the second layers are arranged parallel to one another.

12. A method for producing the arrangement according to claim 1,

wherein a first and at least one further lead frame are provided,

wherein at least a part of the first lead frame is subjected to a thinning process such that the first lead frame is thinner than the at least one further lead frame so that the lead frame assembly lies only partially in the mounting side,

wherein the lead frames are embedded in a material for a housing,

wherein the capacitor, the component and the control circuit are mounted on the lead frames,

wherein an underside of a part of the first lead frame is at a greater distance from the mounting side of the device than at least one part of the at least one further lead frame, and

wherein the device is mounted on the carrier top side.

13. The method according to claim 12,

wherein the thinning process to which the first lead frame is subjected comprises a deep etch so that a thickness of the first lead frame is between 50% and 90% inclusive of a thickness of the at least one further lead frame.

9. An arrangement having a surface-mountable electrical device and having a carrier, the surface-mountable electrical device comprising

at least one electrical component which is a semiconductor component and which is intended for generating radiation,

a control circuit for pulsed operation of the component,

a capacitor which is connected to the component electrically in series and which is configured for the pulsed energization of the component, and

a lead frame assembly having a plurality of different lead frames as a mounting platform for the component, the capacitor and the control circuit, wherein the lead frame assembly comprises a lead frame that is thinner than at least one other lead frame of the plurality of different lead frames so that the lead frame assembly lies only partially in a mounting side,

wherein

the device is applied to a top side of the carrier,

a contact layer having a plurality of contact points is present on the top side, and the lead frames are electrically and mechanically connected to said contact points, and

the lead frames are partially spaced apart from the top side,

wherein in a plan view, a discharge current in the device through the component is congruent with the discharge current in the contact layer,

wherein a distance between the contact layer and a first lead frame of the plurality of lead frames on which the component is located is at most 1.5 mm.