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EN2360QI Datasheet(PDF) 16 Page - Enpirion, Inc. |
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EN2360QI Datasheet(HTML) 16 Page - Enpirion, Inc. |
16 / 24 page 07514 September 17, 2012 Rev: A EN2360QI ©Enpirion 2012 all rights reserved, E&OE Enpirion Confidential www.enpirion.com, Page 16 Thermal Overload Protection Thermal shutdown circuit will disable device operation when the junction temperature exceeds approximately 150ºC. After a thermal shutdown event, when the junction temperature drops by approx 20ºC, the converter will re-start with a normal soft-start. Input Under-Voltage Lock-Out (UVLO) Internal circuits ensure that the converter will not start switching until the input voltage is above the specified minimum voltage. Hysteresis, input de- glitch and output leading edge blanking ensures high noise immunity and prevents false UVLO triggers. Application Information Output Voltage Programming and Loop Compensation The EN2360QI uses a Type IV Voltage Mode compensation network. Type IV Voltage Mode control is a proprietary Enpirion control scheme that maximizes control loop bandwidth to deliver excellent load transient responses and maintain output regulation with pin point accuracy. For ease of use, most of this network has been customized and is integrated within the device package. The EN2360QI output voltage is programmed using a simple resistor divider network (RA and RB). The feedback voltage at VFB is nominally 0.6V. RA is predetermined based on Table 5 and RB can be calculated based on Figure 10. The values recommended for COUT, CA, RCA and REA make up the external compensation of the EN2360QI. It will vary with each PVIN and VOUT combination to optimize on performance. The EN2360QI solution can be optimized for either smallest size or highest performance. Please see Table 5 for a list of recommended RA, CA, RCA, REA and COUT values for each solution. Figure 8: VOUT Resistor Divider & Compensation Components. See Table 5 for details. Input Capacitor Selection The EN2360QI requires a 22µF/1206 input capacitor. Low-cost, low-ESR ceramic capacitors should be used as input capacitors for this converter. The dielectric must be X5R or X7R rated. Y5V or equivalent dielectric formulations must not be used as these lose too much capacitance with frequency, temperature and bias voltage. In some applications, lower value capacitors are needed in parallel with the larger, capacitors in order to provide high frequency decoupling. Table 3 contains a list of recommended input capacitors. Recommended Input Capacitors Description MFG P/N 22µF, 16V, X5R, 10%, 1206 Murata GRM31CR61C226ME15 22µF, 16V, X5R, 20%, 1206 Taiyo Yuden EMK316ABJ226ML-T Table 3: Recommended Input Capacitors Output Capacitor Selection As seen from Table 5, the EN2360QI has been optimized for use with one 100µF/1206 plus two 47µF/1206 output capacitors for best performance. For the smallest solution size configuration see Table 5. Low ESR ceramic capacitors are required with X5R or X7R rated dielectric formulation. Y5V or equivalent dielectric formulations must not be used as these lose too much capacitance with frequency, temperature and bias voltage. Table 4 contains a list of recommended output capacitors Output ripple voltage is determined by the aggregate output capacitor impedance. Capacitor impedance, denoted as Z, is comprised of capacitive reactance, effective series resistance, ESR, and effective series inductance, ESL reactance. Placing output capacitors in parallel reduces the impedance and will hence result in lower ripple voltage. |
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