ASTEC AMERICA/SEMICOND | 4 Switch Mode Regulated DC/DC Converters SINGLE OUTPUTS TO 30 WATTS * 2:1 INPUT RANGE * CONVERTER SHUTDOWN INPUT PROTECTION The UM, UMC Series are very efficient (to 80%) single output DC/DC con- verters that offer the versatility of a 2:1 input range. The series offers input ranges of 9-18 Vde, 18-36 Vde and 35-70 Vde and can withstand surges of 25, 60 and 100 V respectively for 12, 24 and 48 Vin models. The self-resetting shutdown, which occurs at 19 V, 38 V and 75 V, depending on model, protects the supply in the event of an input supply failure while input filtering holds reflected ripple to 30 mA Pk-Pk (max) to protect the input source from internally generated spikes, The UM, UNC Series offers single out- puts of 5, 12 and 15 Vdc at from 1 Ato 4A. All outputs are free of chip damaging overshoot and are over- current protected by power foldback. Overvoltage protection is by automatic self-resetting crowbar. Thus, this series offers protection for both the input source and output load making it system safe for a variety of applications. This series features input to output (I/O) isolation of 1500 Vdc and is available in both chassis mount (UMC) and P.C. mount (UM) versions by mode! designation. Careful design techniques of this pulse width modulated forward converter series result in a low case temperature rise of less than 15C above ambient, for all but the 30 watt models which have a rise of less than 25C. This cool operation substantially increases the MTBF of the converter and nearby load Circuitry. T-51-( UM, UMC Application Notes The 2:1 input range makes the UM, UMC series ideal for use where the in- put source is poorly regulated. The worst Situations involve industrial pro- cess control where raw 24 Vdc is bussed over long distances, therefore being subject to noise pickup and large inductive spikes caused by load changes. , Telecommunications applications operating from 48 V central office batteries are susceptible to wide voltage variations, due to battery charge and discharge cycles, as well as high noise conditions. The special features used in this converter allow the use of external transient suppression devices that do not draw any current within the operat- ing specifications of the converter. SEMICONDUCTOR CIRCUITS, INC. ASRANGE RD.. WINDHAM,N.H.03087 (603) 893-2330 TWX (710) 366-0505 7A General Specifications Input Reflected Ripple 30 MA pk-pk (max) Output Voltage Tolerance +2% Fixed Regulation (line/load) 0.1/0.1% Ripple & Noise 7 mV (VRMS): Greater of 50 mv pk-pk or 1% of Vout (Vpk-pk) Operating Temperature Range 25C to + 71C (no derating) Storage Temperature Range 40C to + 85C input to Output Isolation Voltage 1500 Vde Temperature Coefficient 0.02%/ C (typ) Overcurrent Protection Power Foldback Overvoltage Protection Automatic self-resetting crowbar Input Protection (Converter Shutdown) 9-18 V Rated input 25 V sustained; shutdown set at i9 V 18-36 V Rated Input 60 V sustained; shutdown set at 38 V 35-70 V Rated Input 100 V sustained; shutdown set at 75V Switching Frequency 33 kHz (typ) Startup Time 70 ms (typ) ASTEC AMERICA/SEMICOND 52 D MM 1013152 COOOL 9 MMAAL ~T-51-|| Ordering Information UM, UMC a , -<FRY input Taps neg Fee it Bere 2 tes oe YG Rash vied ned Voltage Output Output . Range Voltage Current Efficiency Pkg. . (Vdc) (Vdc) (Vdc) {%) (Fig.) Model Number . 1-C UM11-300-12 9-18 70-60 2-D UMC11-300-12 1-C UM11-300-24 18-36 3000 70-80 2-D UMC11-300-24 1- UM11-300-48 35-70 5V 70-80 2-D UMC11-400-48 - 1-D UM11-400-24 18-36 4000 70-80 2-D UMC11-400-24 1-D UM11-400-48 35-70 70-80 2-D UMC11-400-48 1-C UM12-100-12 18 70-80 2-D UMC12-100-12 1-C UM12-100- 24 18-36 iv 1000 70-80 2-D UMC12-100-24 1-C UM12-100-48 35-70 70-80 2-D UMC12-100-48 1-D UM12-200-48 35-70 2000 70-80 2-D UMC12-200-48 - 1-C UM13-100-12 9-18 70-80 2-D UMC13-100-12 . . 1-C UM13-100-24 18-36 15V 1000 70-80 2-D UMC13-100-24 ; 1-C UM13-100-48 35-70 70-60 2-D UMC13-100-48 . 1-D UM13-200-48 35-70 2000 70-80 2-D UMC13-200-48 Other versions available, please consult factory. : Socket Information: Standard UM, UMC use socket P/N #100013 (For socket dimensional information refer to page 23 Dimensions and Connections Connections PIN/TERMINAL 043 1 +Vde in 0.88 iW 2 Vdc in 33Y _fer 3 +Vde out meee eee REF 4 Do not connect ~ 4 gpph--- = a, ma 5 -Vde out eM pp----- ee eres 158 Ge a 2 vgs 435 8 ae ao) 140) per rT Application Notes: 132 A oss et nepod ff 8 ae 1. The Crowbar automatically triggers at id ay 1} ~~4---4. the threshold level and clamps the v Loe J output voltage to less than 7 Voit untl! os 1 i reset. For O.V. conditions persisting nen ener +128) 28a less than 10 ms, reset occurs auto- wore? 7 = matically; for O.V. conditions persisting | over 20 ms, the unit remains clampe o : 25 2| oT. until cycled. The threshold levels are Tt ian & Bin factory set at 6.2, 13.5 and 17 V for the REF 3 e 4 5, 12 and 15 V models respectively. BOTTOM VIEW REF 125 2. For decoupling, we recommend the SEENOTE2 jaca addition of a 10 pf tantalum capacitor (31.8) . | ns in shunt with the load. 2S ner TOP VIEW BOTTOM VIEW Notes: . Fig.1 Fig. 2 1. Five Pins, 0.040 (1) Dia x 0.20 (5.1) Lo Min 2. Mounting Inserts 4-40 x 0.1 (2.5) Dp Min 3. brmensions are given in both Inches and. mm SEMICONDUCTOR = CIRCUITS, INC. 49. RANGE AD, WINDHAN, N.H. 03087 (603) 893-2330 TWX {710)386-0505 8A