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EN5337QI Datasheet(PDF) 9 Page - Enpirion, Inc. |
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EN5337QI Datasheet(HTML) 9 Page - Enpirion, Inc. |
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9 / 12 page  02638 6/18/2009 Rev:D EN5337QI ©Enpirion 2009 all rights reserved, E&OE 9 www.enpirion.com Input Under-Voltage Lock-Out 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 ensure high noise immunity and prevent false UVLO triggers. Compensation The EN5337QI uses a type 3 compensation network. A piece of the compensation circuit is the phase lead capacitor CA in Figure 5. This network will provide wide loop bandwidth and excellent transient performance for most applications. It is optimized for use with about 50μF of output filter capacitance at the voltage sensing point. Additional load decoupling capacitance may be placed beyond the voltage sensing point outside the control loop. Voltage mode operation provides high noise immunity at light load, and low output impedance. In some applications modifications to the compensation may be required. For more information, contact Enpirion Applications Engineering support. Application Information The EN5337QI output voltage is determined by the voltage presented at the XFB pin. This voltage is set by way of a resistor divider between VOUT and AGND with the midpoint going to XFB. A phase lead capacitor CA is also required for stabilizing the loop. Figure 5 shows the required components and the equations to calculate the values. XFB V OUT R A C A R B ) 75 . 0 ( * 75 . 0 22 , 150 V VOUT RA RB pF CA k RA − = = Ω = Figure 5: VOUT Resistor Divider Network and Compensation Capacitor CA Input Capacitor Selection The EN5337QI requires between 10uF and 20uF of input capacitance. 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. Recommended Input Capacitors Description MFG P/N Murata GRM31CR71A106KA01L 10uF, 10V, 10% X7R, 1206 (1-2 capacitors needed) Taiyo Yuden LMK316B7106KL-T Murata GRM31CR61A226ME19L 22uF, 10V, 20% X5R, 1206 (1 capacitor needed) Taiyo Yuden LMK316BJ226ML-T Output Capacitor Selection The EN5337QI has been optimized for use with approximately 50μF of output filter capacitance at the voltage sensing point Additional load decoupling capacitance may be placed beyond the voltage sensing point outside the control loop. 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. Output ripple voltage is determined by the aggregate output capacitor impedance. Output impedance, denoted as Z, is comprised of effective series resistance, ESR, and effective series inductance, ESL: Z = ESR + ESL Placing output capacitors in parallel reduces the impedance and will hence result in lower |
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