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AN587 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN587 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 3 page  1/3 AN587 APPLICATION NOTE ® TRANSISTOR PROTECTION BY TRANSIL™ August 2001 B.RIVET In a large number of applications, we find the circuit in Fig. 1 where a TRANSIL™ is used to protect a switch that controls an inductive load. The switch can be a bipolar or a MOS transistor. The purpose of this paper is to calculate the dissipated power in the TRANSIL™ and the pulse current duration. INTRODUCTION L, r +Vcc or Fig. 1: Basic diagram When the switch turns off we use the equivalent circuit represented in Fig. 2. The worst case is to consider VCL =VBR min. This hypothesis will be used in all formulae. 1. CIRCUIT MODELLING Vcc L r V= V CL BRmin VBR Fig. 2: Equivalent Circuit VCL Clamping voltage VBR Breakdown voltage We can express the current i through the TRANSIL by the following formula: ( ) iI VV r r t L P BR cc =+ − −× min exp + − VV r cc BR min Ip is the current through the coil when the transistor switches off. Fig. 3 shows the current variation versus time. 2. CURRENT IN THE TRANSIL i IP r V- V CC BR t1 t Fig. 3: Current Waveform t1 can be calculated by: t L r In VV VV rI BR cc BR cc p 1 =− × − −+ min min |
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