CN211181601U

CN211181601U - Low-cost drive circuit of programming device VPP high-voltage circuit

Info

Publication number: CN211181601U
Application number: CN202020353479.8U
Authority: CN
Inventors: 季春
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2020-08-04
Anticipated expiration: 2030-03-19

Abstract

The utility model discloses a low-cost drive circuit of programmer VPP high-voltage circuit, including triode QP1, triode QC1, triode QN1, zener diode ZD1 and constant current drive chip U1, zener diode ZD 1's positive pole is connected to constant current drive chip U1's pin OUT0, triode QP 1's base is connected to zener diode ZD 1's negative pole, voltage VPP is connected to triode QP 1's projecting pole, triode QN 1's collecting electrode is connected to triode QP 1's collecting electrode, diode D1's negative pole and ZIF latch seat, the utility model discloses can make the VDD VPP GND drive circuit cost of general programmer product reduce 50%, drive circuit board area reduces 50%, and product competitiveness can strengthen greatly.

Description

Low-cost drive circuit of programming device VPP high-voltage circuit

Technical Field

The utility model relates to a drive technical field specifically is a low-cost drive circuit of programmer VPP high-voltage circuit.

Background

Currently, in all-drive general programmers of other companies, the VCC/VPP/GND drive structure is shown in fig. 1 (actual products have the same drive circuit from 48 to 144 paths), ZIF is a programming lock socket interface, and is connected to pins of a target chip, and the functions of these pins may be general IO, chip power supply VDD (usually 1.2V to 6.5V), chip programming high-voltage VPP (usually 6.2V to 25V) or power supply GND, so that the circuit shown in fig. 1 needs to be configured to complete the VCC/VPP/GND switching function. The circuit structure uses too many components, so that the cost is higher, the product volume is overlarge, and the carrying is inconvenient.

However, the scheme has a problem to be solved, the constant current driving chips available on the market, such as models SB16726, ICN2026 and the like, the voltage resistance of the OUT end is usually between 17V and 20V, and the voltage of the programming unit VPP is as high as 25V, so that the breakdown of the OUT end of the constant current chip can be caused by direct use.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low-cost drive circuit of programmer VPP high-voltage circuit to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a low-cost driving circuit of a programmer VPP high-voltage circuit comprises a triode QP1, a triode QC1, a triode QN1, a zener diode ZD1 and a constant current driving chip U1, wherein a pin OUT0 of the constant current driving chip U1 is connected with an anode of a zener diode ZD1, a cathode of the zener diode ZD1 is connected with a base of a triode QP1, an emitter of the triode QP1 is connected with voltage VPP, a collector of the triode QP1 is connected with a collector of the triode QN1, a cathode of a diode D1 and a ZIF locking seat, an anode of a diode D1 is connected with a collector of a QC1, a base of a QC1 is connected with a VDD constant current driving chip, an emitter of the triode QC1 is connected with a power supply VDD, and a base of the triode QN.

As a further aspect of the present invention: the voltage VPP is at most 25V.

As a further aspect of the present invention: the voltage VDD is up to 6.5V.

As a further aspect of the present invention: the model of the constant current driving chip U1 is ICN2026 or SB 16726.

As a further aspect of the present invention: the voltage stabilizing diode ZD1 is a voltage stabilizing diode, and the voltage withstanding range of the voltage stabilizing diode is 4.7V-8.2V.

As a further aspect of the present invention: the transistor QP1 is a PNP transistor.

As a further aspect of the present invention: the triode QC1 is a PNP triode.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses can make VDD VPP GND drive circuit cost reduction 50% of general programming ware product, drive circuit's circuit board area reduces 50%, and product competitiveness can strengthen greatly.

Drawings

Fig. 1 is a circuit diagram of the prior art.

Fig. 2 is a circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 2, embodiment 1: the embodiment of the utility model provides an in, low-cost drive circuit of programmer VPP high-voltage circuit, including triode QP1, triode QC1, triode QN1, zener diode ZD1 and constant current drive chip U1, zener diode ZD 1's positive pole is connected to constant current drive chip U1's pin OUT0, triode QP 1's base is connected to zener diode ZD 1's negative pole, voltage VPP is connected to triode QP 1's projecting pole, triode QN 1's collecting electrode is connected to triode QP 1's collecting electrode, diode D1's negative pole and ZIF latch seat, triode QC 1's collecting electrode is connected to diode D1's positive pole, triode QC 1's base is connected the constant current drive chip, triode QC 1's projecting pole connecting source VDD, triode QN 1's base passes through resistance RN1 and connects the GN.

The problem that the VPP high voltage exceeds the withstand voltage of the OUT end of the constant current chip is solved by connecting a voltage regulator tube ZD1 in series in a constant current driving circuit.

As shown in fig. 2, assuming that the voltage resistance of the OUT terminal of the constant current chip is 20V, the voltage regulator tube is 5.1V, the highest VPP voltage of 25V passes through the eb junction of QP1 and ZD1, and then the voltage applied to the OUT0 terminal is about 25-0.7-5.1-19.2V, which is lower than the voltage resistance of the OUT terminal of the chip, so that the constant current chip can normally operate.

By using the circuit structure, the cost of the VDD/VPP/GND driving circuit of a general programmer product can be reduced by 50%, the circuit board area of the driving circuit can be reduced by 50%, and the product competitiveness can be greatly enhanced.

Example 2: in addition to embodiment 1, the model of the chip U1 is a constant current driving chip such as ICN2026 or SB 16726.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A low-cost driving circuit of a programmer VPP high-voltage circuit comprises a triode QP1, a triode QC1, a triode QN1, a zener diode ZD1 and a constant-current driving chip U1 and is characterized in that a pin OUT0 of the constant-current driving chip U1 is connected with the anode of a zener diode ZD1, the cathode of the zener diode ZD1 is connected with the base of a triode QP1, the emitter of the triode QP1 is connected with voltage VPP, the collector of the triode QP1 is connected with the collector of a triode QN1, the cathode of a diode D1 and a ZIF locking seat, the anode of a diode D1 is connected with the collector of a triode QC1, the base of the triode QC1 is connected with the VDD constant-current driving chip, the emitter of the triode QC1 is connected with a power supply VDD, and the base of.

2. The low-cost driving circuit of a programmer VPP high-voltage circuit of claim 1, wherein the voltage VPP is up to 25V.

3. The low-cost driving circuit of a programmer VPP high-voltage circuit of claim 1, wherein the power supply VDD is up to 6.5V.

4. The low-cost driving circuit of a programmer VPP high-voltage circuit as claimed in claim 1, wherein the model of the constant current driving chip U1 is ICN2026 or SB 16726.

5. The low-cost driving circuit of a high-voltage circuit of a programmer VPP according to claim 4, wherein the Zener diode ZD1 is Zener diode with voltage withstanding range of 4.7V-8.2V.

6. The low-cost driving circuit of a programmer VPP high-voltage circuit as claimed in claim 4, wherein said transistor QP1 is a PNP transistor.

7. The low-cost driving circuit of a programmer VPP high-voltage circuit as claimed in claim 4, wherein said transistor QC1 is a PNP transistor.