Under voltage locking circuit with temperature compensation
A technology of undervoltage lockout circuit and temperature compensation circuit, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of poor stability of the switching threshold value of the undervoltage lockout circuit and insufficient system reliability, and achieves enhanced stability and reliability. Reliability, Avoiding Drift, Improving Accuracy
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[0021] Embodiment 1 As shown in Figure 1, an undervoltage lockout circuit with temperature compensation includes a voltage sampling circuit, a temperature compensation circuit, a buffer circuit and a feedback circuit. The voltage sampling circuit includes a first resistor R1, a second resistor R2, and a third resistor R3 connected in series between the first voltage source VCC and the ground terminal GND, and the output of the voltage sampling circuit is formed between the second resistor R2 and the third resistor R3 At terminal V1, a node C is formed between the first resistor R1 and the second resistor R2.
[0022] The temperature compensation circuit adopts a bandgap reference circuit, which includes a first field effect tube M1, a second field effect tube M2, a first transistor Q1, a second transistor Q2, a fourth resistor R4, and a fifth resistor R5. The gate and drain of the first field effect transistor M1 are connected together. The sources of the first field effect transi...
Example Embodiment
[0041] Embodiment 2 As shown in Fig. 2, in this embodiment, the first resistor R1, the second resistor R2, and the third resistor R3 used in the voltage sampling circuit in the embodiment 1 use the fourth field effect transistor M4 and the fifth field effect transistor M4, respectively. The effect tube M5 and the sixth field effect tube M6 are replaced. The field effect tube can not only play the role of resistor divider, but also can reduce the starting current of the circuit and reduce the static power consumption when the circuit is working normally. The other structure of the circuit and the principle of temperature compensation are the same as in Embodiment 1, and will not be repeated.
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