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L6226Q Datasheet(PDF) 11 Page - STMicroelectronics |
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L6226Q Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 28 page L6226Q Circuit description 11/28 4.3 Truth table 4.4 Non-dissipative overcurrent detection and protection An overcurrent detection circuit (OCD) is integrated. This circuit can be used to provides protection against a short circuit to ground or between two phases of the bridge as well as a roughly regulation of the load current. With this internal over current detection, the external current sense resistor normally used and its associated power dissipation are eliminated. Figure 7 shows a simplified schematic of the overcurrent detection circuit for the bridge A. bridge B is provided of an analogous circuit. To implement the over current detection, a sensing element that delivers a small but precise fraction of the output current is implemented with each high side power MOS. Since this current is a small fraction of the output current there is very little additional power dissipation. This current is compared with an internal reference current IREF. When the output current reaches the detection threshold Isover the OCD comparator signals a fault condition. When a fault condition is detected, an internal open drain MOS with a pull down capability of 4 mA connected to OCD pin is turned on. Figure 8 shows the OCD operation. This signal can be used to regulate the output current simply by connecting the OCD pin to EN pin and adding an external R-C as shown in Figure 7. The off time before recovering normal operation can be easily programmed by means of the accurate thresholds of the logic inputs. IREF and, therefore, the output current detection threshold are selectable by RCL value, following the equations: ● Isover = 2.8 A ± 30 % at -25 °C < TJ < 125 °C if RCL = 0 Ω (PROGCL connected to GND) ● Isover = ±10 % at -25 °C < TJ < 125 °C if 5 kΩ < RCL < 40 kΩ Figure 9 shows the output current protection threshold versus RCL value in the range 5 kΩ to 40 k Ω. The disable time tDISABLE before recovering normal operation can be easily programmed by means of the accurate thresholds of the logic inputs. It is affected whether by CEN and REN Table 7. Truth table Inputs Outputs EN IN1 IN2 OUT1 OUT2 LX (1) 1. X = Don't care X High Z (2) 2. High Z = High impedance output High Z HL L GND GND HH L Vs GND HLH GND Vs HH H Vs Vs 11050 R CL ---------------- |
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