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| NON-ISOLATED DC/DC CONVERTERS 3 -15V Input / Programmable Output / 25A S7KS- 25D (Keystone) PRELIMINARY * * * * * * * Compact surface mount package Ultra Wide input range (3 - 15V) 6 bit digital voltage programming (0.7 to 5.4V) 25A of output current Remote sense Remote On/Off Power Good * * * Analog Trim Single wire current sharing Autophasing Description The S7KS Keystone Series from Bel is a non-isolated step down DC/DC converters providing up to 25A of output current in a compact surface mount package with the capability of paralleling and autophasing to provide up to 200A of output current. This product is designed to operate from any source voltage from 3 to 15V and provide any output voltage from 0.7V to 5.4V with 6-bit digital programming and 50mV resolution. This DC/DC converter requires no external components to operate and provides the ultimate in flexibility. It also greatly simplifies inventory management since a single part can be configured to service a very broad range of applications. Part Selection Output Voltage 0.7 - 5.4V 0.7 - 5.4V Input Voltage 3 - 15V 3 - 15V Max. Output Current 25A 25A On/Off Logic Active High Active Low Part Number S7KS-25D1P0 S7KS-25D1PL Input Specifications Parameter Input Voltage Range Input Current (full load) Bias Voltage Input Current (bias supply) Reflected Ripple Current Min 3.0 VDC 4.8 VDC 100mA Typ Max 15 VDC 18A 5.2 VDC 200mA 150mA rms Notes With 100uF, 30mOhm capacitor and 500nH of input inductance. Output Specifications Parameter Voltage Programmability Output Current Set Point Accuracy Regulation Line Regulation Load Regulation Temperature Ripple and Noise pk-pk rms Turn on Time Transient Response Deviation Settling Time Min 0.7V 0A Typ Max 5.4V 25A 2% 10mV 35mV 40mV 50mV 20mV 8mS 150mV 280uS 0 to 20MHz Bandwidth Full load with external 680uF oscon capacitor on output. From Enable di/dt = 5A/uS Load step =50% of max load. with external 680uF oscon Notes 10mS Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com NON-ISOLATED DC/DC CONVERTERS 3 -15V Input / Programmable Output / 25A Compatible Output Specifications (cont.) Parameter Remote Sense Compensation Output Capacitance Min Typ 0.3VDC Max TBD uF Notes For applications requiring higher output capacitance please consult factory. General Specifications Parameter Switching Frequency Dimensions inches mm Weight Operating Temperature Non-Operating Temperature Protection Features Over current Undervoltage Remote On/Off Analog Trim Range Specification 300kHz typical (fixed) 1.80 x 1.09 x .49 45.7 x 27.7 x 12.4 TBD -40C to 85C -40C to 100C 110% to 140% max Io UVLO Vin < 3.0V Active Low +/- 10% Pin Connections Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Function Vout Vout Vout +Sense Trim (analog) Vpp (program/reset) I share CLK Autophase A Autophase B Power Good Vin Vin Vin Gnd Gnd V bias (+5V) On/Off VID5 VID4 VID3 VID2 VID1 VID0 -Sense Gnd Gnd Gnd Voltage Identification (VID) Code VID4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 VID3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 VID2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 VID1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 VID0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 VID5=0 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 VID5=1 2.30 2.40 2.50 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 3.50 3.60 3.70 3.80 3.90 4.00 4.10 4.20 4.30 4.40 4.50 4.60 4.70 4.80 4.90 5.00 5.10 5.20 5.30 5.40 28 15 1 14 Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com NON-ISOLATED DC/DC CONVERTERS 3 -15V Input / Programmable Output / 25A Feature Descriptions Remote Sense These modules employ double-ended remote sense. The +Sense lead should be connected to Vout at the desired point of regulation (typically as close to the load as possible). Similarly, the - Sense lead should be connected to Gnd at the desired point of regulation. If the Sense feature is not being used, these signals should be connected to Vout and Gnd at the module. Voltage Programming The output voltage may be digitally programmed with a 6-bit word to any voltage from 0.7V (000000) to 5.4V (111111). When the most significant bit (MSB) is 0 the resolution is 50mV per step. When the MSB toggles to 1, the resolution becomes 100mV per step. Analog Trim An analog trim pin may be used to margin the output voltage up or down 10% for any give digitally programmed set point. Vpp / Reset This pin is used in the factory to program the embedded micro-controller. Power Good The PwrGood pin is an open drain signal that is pulled low whenever the output voltage is within 10% of its expected voltage. The maximum pull-up voltage for this signal is 7V. Typically it would be pulled high to a 3.3V or 5V rail. Bias Voltage This pin supplies voltage to the micro-controller and to the multi-chip module. If the source voltage is 5V then Vin and Vbias may be tied together. If the source voltage is lower or higher than the 5V requirement for the bias voltage then this pins should be connected to a source capable of supplying at least 200mA. Load Sharing When the outputs and the I share pins of multiple modules are tied together, the units will share the load to within 2A. Auto-Phasing When multiple Keystone modules are used on the same board they may be connected together in a such a way that they operate as a single multiphase unit. Each of the CLK signals should be tied together in a star connection. The A signal of the first unit should be left floating. The B signal of the each unit should be connected to the A signal of the following unit. The B signal of the last unit should be grounded. Regardless of whether or not the units are of the same output voltage and/or whether or not they are load sharing, the units may still be autophased to provide for input ripple current cancellation. Efficiency Vin = 5V 98.0 96.0 94.0 92.0 90.0 88.0 86.0 84.0 82.0 5A 10A 15A 20A 25A 3.3V 1.8V Vin = 12V 96.0 94.0 92.0 90.0 88.0 86.0 84.0 82.0 80.0 5A 10A 15A 20A 25A 3.3V 1.8V Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com NON-ISOLATED DC/DC CONVERTERS 3 -15V Input / Programmable Output / 25A Compatible Product Dimensions Note: This information is for discussion purposes only and product specifications are subject to change without notice. of these specifications does not imply any commitment by Bel to manufacture this or similar products. Publication 2003 Bel Fuse Inc. Specifications subject to change without notice. 040303 CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com FAR EAST Bel Fuse Ltd. 8F/ 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com EUROPE Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com |
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