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HC55185FCR Datasheet(PDF) 7 Page - Intersil Corporation |
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HC55185FCR Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 20 page 7 FN4831.14 December 18, 2006 Special Considerations for the QFN Package The new QFN package offers a significant footprint reduction (65%) and improved thermal performance with respect to the 28 lead PLCC. To realize the thermal enhancements and maintain the high voltage (-100V) performance, the exposed leadframe should be soldered to a power/heat sink plane that is electrically connected to the high battery supply (VBH) within the application board. This approach distributes the heat evenly across the board and is accomplished by using conductive thermal vias. Reference technical brief TB379 and AN9922 for additional information on thermal characterization and board layout considerations. Product Family Cross Reference The following table provides an ordering and functional cross reference for the existing HC55180 through HC55184 products and the new and improved HC55185 product. Any of the HC55185 products may be used without the battery switch function by shorting the supply pins VBL and VBH together. This provides compatibility with HC55180 type applications which do not require the battery switch. Application Circuit Modifications The HC55185 basic application circuit is nearly identical to that of the HC55180 through HC55184. The HC55185 requires an additional resistor to program the transient current limit feature. This programming resistor is connected from pin 16 (TL) to ground. In addition some component values have been changed to improve overall device performance. The table below lists the component value changes required for the HC55185 application circuit. The value of RS is based on a 600 Ω termination impedance and RP1 = RP2 = 49.9 Ω. Design equations are provided to calculate RS for other combinations of termination and protection resistance. The CFB capacitor must be non-polarized for proper device operation in Reverse Active. Ceramic surface mount capacitors (1206 body style) are available from Panasonic with a 6.3V voltage rating. These can be used for CFB since it is internally limited to approximately ±3V. The CDC capacitor may be either polarized or non polarized. Parametric Improvements The most significant parametric improvement of the HC55185 is reduction in Idle Channel Noise. This improvement was accomplished by redistributing gains in the impedance matching loop. The impact to the application circuit is the change in the impedance programming resistor RS. The redistribution of gains also improves AC performance at the upper end of the voice band. VBH to 4-Wire 300Hz ≤ f ≤ 1kHz - 40 - dB 1kHz < f ≤ 3.4kHz - 45 - dB NOTES: 3. These parameters are controlled via design or process parameters and are not directly tested. These parameters are characterized upon initial design release and upon design changes which would affect these characteristics. 4. Differential Ringing Gain is measured with VRS = 0.795VRMS for -100V devices, VRS = 0.663 VRMS for -85V devices and VRS = 0.575VRMS for -75V devices. 5. Longitudinal Balance is tested per IEEE455-1985, with 368 Ω per Tip and Ring terminal. 6. These parameters are tested 100% at room temperature. These parameters are guaranteed not tested across temperature via statistical characterization and design. 7. The power dissipation is based on actual device measurements and will be less than worst case calculations based on data sheet supply current limits. 8. Characterized with 2 x 10 μs, and 10 x 1000μs first level lightning surge waveforms (GR-1089-CORE) 9. For Unbalanced Ringing the Tip terminal is offset to 0V and the Ring terminal is centered at Vbh/2 + 0.5V. Electrical Specifications Unless Otherwise Specified, TA = -40°C to +85°C for industrial (I) grade and TA = 0°C to +85°C for commercial (C) grade, VBL = -24V, VBH = -100V, -85V or -75V, VCC = +5V, AGND = BGND = 0V, loop current limit = 25mA. All AC parameters are specified at 600 Ω 2-wire terminating impedance over the frequency band of 300Hz to 3.4kHz. Protection resistors = 0 Ω. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TABLE 1. PRODUCT CROSS REFERENCE EXISTING DEVICES FUNCTIONAL EQUIVALENT HC55180CIM, HC55180DIM None Offered HC55181AIM, HC55182AIM HC55185AIM HC55181BIM, HC55182BIM HC55185BIM HC55181CIM, HC55182CIM HC55185CIM HC55181DIM, HC55182DIM HC55185DIM HC55183ECM, HC55184ECM HC55185ECM TABLE 2. COMPONENT VALUE CHANGES REFERENCE HC55180 - 184 HC55185 RS 210k Ω 66.5k Ω RP1 ≥ 35Ω≥ 49Ω RP2 ≥ 35Ω≥ 49Ω CFB 0.47 μ 4.7 μ HC55185 |
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