Short-circuit protection circuit for driving tubes and inductor in switch-type charge management chip
A charging management chip and short-circuit protection circuit technology, which is applied in the design of analog integrated circuits and the field of short-circuit protection circuits, can solve the problems of being unable to distinguish between over-current and short-circuit, and achieve the effect of ensuring circuit response speed and improving circuit reliability
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[0027] The present invention will be further described below in conjunction with accompanying drawings and embodiments thereof.
[0028] refer to figure 2 , the present invention is used for the short-circuit protection circuit of drive tube and inductance in the switch-type charge management chip, including 2 high-voltage NMOS tubes M 1 and M 2 , the lower pipe detection unit 1, the upper pipe detection unit 2 and the logic drive unit 3. in:
[0029] The high voltage NMOS tube M 1 and M 2 , whose gate is connected and connected to the control signal V input by the logic drive unit 3 G , its source is connected and connected to the logic drive unit 3; the high-voltage NMOS transistor M 1 The drain of the charge management chip is connected to the input voltage V IN Connected, high voltage NMOS tube M 2 The drain output charging voltage V HI .
[0030] The logic drive unit 3 generates the upper tube drive signal V according to the comparison signal PWM generated insi...
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