GS-R4840NV 36 w negative switching regulator december 1993 1/3 type v in v out i out GS-R4840NV -40 to -60 v -22 to -60 v -600 ma features digital input for voltage selection short-circuit protection overvoltage protection thermal protection softstart fault signal indication output high efficiency (>80%) description the GS-R4840NV is a negative input, negative output switching voltage regulator that provides up to 36w output power without input-output isolation. the output voltage is programmable by input logic signals that allow 64 steps (6 bit) of regulated output, from -22 to -60v. electrical characteristics (t amb = 25 c unless otherwise specified) symbol parameter test conditions min typ max unit v i input voltage v o = -22 to -60v i o = -10 to -600ma -40 -48 -60 v v ir input ripple voltage v i = -40 to -60v i o = -600ma 20 mvpp v o output voltage v i = -40 to -60v i o = -10 to -600ma -22 -60 v v or output ripple voltage v o = -22 to -60v i o = -600ma 4 10 mvpp v oov output overvoltage protection v i = -40 to -60v i o = -10 to -600ma vo+5% vo+10% v i o output current v i = -40 to -60v v o = -22 to -60v -10 -600 ma i ol current limit v i = -40 to -60v overload condition -900 ma i osc output average short circ. current v i = -40 to -60v -80 ma f s switching frequency 100 khz h efficiency v i = -48v i o = -600ma v o = -48v 80 82 % r th thermal resistance case to ambient 4 c/w t cop operating case temperature range 0 +85 c t stg storage temperature range -20 +105 c
2/3 package f. dimensions in mm. (inches) connection diagram and mechanical data pin description pin function description 1 -vin negative input voltage. 2 inhibit/ enable remote inhibit/enable logically compatible with cmos or open collector ttl. the converter is off (inhibit) when this pin is unconnected or the voltage applied is in the range of 2 to 5v (referred to gnd). the converter is on (enable) for a control voltage in the range of 0 to 0.8v maximum. 3 gnd in return for input voltage source and +5v logic supply voltage. internally connected to pin 15. 4 +5v in +5v logic supply voltage. maximum voltage must not exceed 7v. 5 db0 data bit 0 (lsb). 6 db1 data bit 1. 7 db2 data bit 2. 8 db3 data bit 3. 9 db4 data bit 4. 10 db5 data bit 5 (msb). 11 cs chip select. an active low input control which is the device enable input terminal. 12 wr write control. an active low control which enables the microprocessor to write data to the dac. 13 -vout negative output voltage. 14 fault fault indication output (referred to gnd). the fault signal is high (ttl compatible level) when: - the inhibit is on (high) - an output overload is present (vo < 18v typ.) - an overtemperature is present - an overvoltage is present (vo > vo+5%) 15 gnd out return for output voltage source. internally connected to pin 3. note: case internally connected to ground. GS-R4840NV
3/3 user notes digital information the GS-R4840NV accepts 6 bit binary at the data inputs db0 to db5. data are transferred when cs is low and during the rising edge of wr signal. figure 1 - signals timing. t ds and t dh have to be 100ns and 50ns minimum respectively (see fig. 1). information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences of use of such information nor for any inf ringement of pat ents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specification mentioned in this publication are subject to change without noti ce. this publication supersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems with out express written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics C all rights r eserved sgs-thomson microelectronics group of companies australia - brazil - france - germany - hong kong - i taly - japan - korea - malay sia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. GS-R4840NV
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