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IRUH3301A2AKB Datasheet(PDF) 4 Page - International Rectifier |
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IRUH3301A2AKB Datasheet(HTML) 4 Page - International Rectifier |
4 / 9 page 4 www.irf.com IRUH3301A2AK IRUH3301A2AP Application Information Fig. 1. Typical Regulator Circuit; Note the SHDN Pin is hardwired in the “ON” position. The ADJ Pin is connected as noted in the “General Layout Rules” section. Over-Current & Over-Temperature Protection The IRUH3301 series provides over-current protection by means of a timed latch function. Drive current to the internal PNP pass transistor is limited by an internal resistor (Rb in Fig. 3) between the base of the transistor and the control IC drive FET. If an over-current condition forces the voltage across this resistor to exceed 0.5V (nom), the latch feature will be triggered. The time-to- latch (t LATCH) is nominally 10ms. If the over-current condition exists for less than tLATCH , the latch will not be set. If the latch is set the drive current to the PNP pass transistor will be disabled. The latch will remain set until one of the following actions occur: 1. The SHDN Pin voltage is brought above 1.2V and then lowered below 0.8V. 2. The V IN Pin voltage is lowered below 1.7V. If the junction temperature of the regulator IC exceeds 140°C nominal, the thermal shutdown circuit will set the internal latch and disable the drive current to the PNP pass transistor as described above. After the junction temperature falls below a nominal 125°C, the latch can be reset using either of the actions described above. Under-Voltage Lock-Out The under-voltage lock-out (UVLO) function prevents operation when V IN is less than 1.7V (nominal). There is a nominal 100mV hysteresis about this point. Input Voltage Range The device control functions fully when V IN is greater than 2.9V. The output current may need to be reduced to avoid the activation of over current protection at 2.9V < V IN < 3.8V. The IRUH3301A1 is recommended for performance optimization when 2.9V < V IN < 3.8V is required. The device enters into under-voltage lock-out when V IN < 1.7V (nominal). When 1.7V (nominal) < VIN < 2.9V, VOUT will track V IN and overshoot may occur. A larger output capacitor should be used to slow down the VOUT rise rate for slow V IN ramp applications. Setting the Output Voltage IRUH3301Axxx 0.1uF and 1uF Ceramic; Two 100uF Low ESR Tantalum V IN GND SHDN ADJ V OUT 0.1uF and 1uF Ceramic; Two 100uF Low ESR Tantalum Input Voltage Output Voltage R1 Choose R1 based upon the desired output voltage using the formula below. Ω ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = 499 * 1 800 . 0 1 V V R OUT Table 1 shows the closest nominal 0.1% tolerance R1 value to provide a given output voltage. Table 1- Values of R1 for a Given Output Voltage VOUT (V) 0.9 1.0 1.2 1.5 1.8 2.5 3.3 Nearest R1 Value (0.1%), (Ohms) 61.9 124 249 437 619 1060 1560 |
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