DC-DC Converters RS Stock Nos , , , &

Transcription

1 DC-DC Converters RS Stock Nos , 92-38, , & These Light weight, compact DC-DC converters, shielded for EMI, can provide local on card regulation or be used in GSR Ref central power supply systems, both in professional and industrial application RS Stock No GSR 40S GSR GSR GSR Connection Diagram (lateral view) Figure 1 GR40 GR400 GR412 S+ S+ P S+ Pin Functions Pin Function - Inhibit TTL compatible input. logic high level signal on this pin disables the module. To be connected to ground when not used. - Reset Output vailable on GR40S only. Reset voltage is high () when output voltage reaches nominal value () and it is generated with a fixed ms delay. - Input voltage Unregulated DC voltage input. Maximum voltage must not exceed 48. Recommended maximum operating voltage is Ground Common ground for input voltage. - Ground Common ground of high current path. The case of the module must be isolated from ground. S - - Sensing Negative For connection to remote load, this pin senses the actual ground of the load itself. To be connected to when not used. S + P - Sensing Positive - Output voltage - Output oltage Regulation For connection to remote loads this pin allows voltage sensing on the load itself. To be connected to when not used. Regulated and stabilized DC voltage is available on this pin. Max output current is 4. The device is protected against short circuit of this pin to ground or to supply. vailable on GR400 only. variable resistor (18 ½ max) connected between this pin and S + can adjust the output voltage.

2 Module Operation The GSR 400 series is a family step down switching mode voltage regulators. Unregulated DC input voltage must be higher than nominal output voltage by at least 3. Minimum input voltage is therefore 8 for GS0R40S, maximum input voltage is 48 for all the types. Output voltage is fixed or adjustable (GR400). Maximum current delivered by the output pin is 4. minimum output current of 200m is required for proper module operation. In no load condition the module still works, but switching frequency varies and electrical characteristics are slightly modified S specifications. To prevent output over currents at switch on, a soft start function is provided. Nominal output voltage is approached gradually in about 2 minutes. The module can be inhibited by a TTL, N MOS and C MOS compatible voltage applied to the pin. When this voltage is at high level, the module is switched off if inhibit signal goes from high to low level the module restarts softly. Maximum DC voltage applicable to this pin is 1. When remote control (inhibit) of the module is not used the pin must be connected to ground. The remote load sensing is another feature provided in all the models. This function is performed by two pins (S +, S - ) that can monitor the voltage directly across the load when this load is connected to the module by long wires: voltage drop on these wires is automatically compensated. The case of the module is internally connected to S. Therefore the case must be always isolated from ground. The switching frequency of the module is khz. To prevent EMI, the module is contained in a metal box that provides, in the meantime, shielding and heatsink. Figure 2 - Shows how to connect the module to remote or nearby loads. LOD S+ LOD Remote Load Connection Nearby Load Connection

3 Electrical Characteristics (T amb = 2 C unless otherwise specified ) (continued) Type GR40S GR412 GR400 Unit Parameter Test Conditions. Min. Typ Max. Min. Typ Max. Min. Typ Max. Output oltage 1 = * Temperature Stability 0. /1.6 m C 1 Input oltage I 0 = I 0 Output Current = * I 0L Current Limit " I ISC verage Input Current =46 Output shorted f S Switching Frequency I 0 =1 khz Efficiency = +8 I 0 = /90 % Line Regulation I 0 =1 = +3 to m/ SR Supply voltage rejection f= Hz I 0 = m/ Load Regulation ÆI 0 =2 (1 to 3 ) /90 m/ r Ripple oltage I OUT = /10 m t SS Soft start time IN =UT /3 ms L Low inhibit oltage H High inhibit oltage I Input current High = µ t CB Crow bar Delay Time µs RH Reset High Level RL Reset Low Level I R = ma I R =1 ma 0.4 v v t R Reset Delay Time ms * Maximum Output Current is guaranteed up to = 36 and derated linearly to 3 at = 40 Mechanical Data (dimensions in mm) Figure C. 013

4 Mother Board Layout Figure ± ± ± GR40S ± ± ± ± ± ± GR ± ± ± ± ± ± GR ± ± ± Printed Circuit Drilling (Components Side) Required holes pattern to be drilled on the mother boards to allow correct mounting Stock No This module differs from the GR400 range in that it provides the following triple outputs, 12, 12. Connection Diagram (top view) Figure OUT 0 IN UT 8803

5 Pin Functions Pin - Reset Output Function Reset output is high when output voltage reaches nominal value (.1 ) and it is generated with a fixed ms delay. proper resistor (270½ min) must be connected between this pin and 1 - Input oltage Unregulated DC voltage input. Maximum voltage must not exceed 40. IN - Ground Common ground for input voltage OUT -Ground Common ground of high current path. The case of the module is connected to this pin. 1 - utput oltage Regulated and stabilized DC voltage is available on this pin. Max output current is 3.. The device is protected against short circuit of this pin to ground or to supply utput oltage Regulated and stabilized 12DC output at 10 m max current referred to. This output can float ±0n respect to OUT and 3. - Ground Reference ground for 2 output utput oltage Regulated and stabilized 12 DC output at 10 m max. current referred to Ground Reference ground for 3 output. Mother Board Layout Figure 6 No 4 Holes 2:01 No 9 Holes Reset UT ± ± ± Printed Circuit Drilled (components side) Module Operation The GSR1212 is a triple output step down switching mode voltage regulator. Unregulated DC input voltage must be higher than nominal output by a least, 4. Minimum input voltage is therefore 9 while maximum input voltage is 40. The main output voltage is and the maximum current delivered is 3.. minimum output current of m is required for proper module operation. The current available on the 12 olt outputs depends on the current delivered by the main output. t 0. on the main output, the max. 12 outputs current is 0.1.

6 To prevent excessive over current at switch on, a soft start function is provided. Nominal output voltage is approached gradually in about 1 ms. The switching frequency of the module is khz. To prevent EMI, the module is contained in a metal box that provides, in the meantime, shielding and heatsink. The Reset output is an auxiliary function useful to reset or inhibit microprocessors when the output voltage, at switch on and off, reaches a prefixed value of 4.9 to.1 or when the output voltage, for any reason, drops below nominal value by more than m. In any case the minimum falling threshold value is 4.7 or higher and the reset output voltage is generated with a fixed delay of ms. This is an open collector output to guarantee maximum flexibility. Time delay of the reset function also rejects wrong information caused by occasional spikes generated during switch on and off. Electrical Characteristics (T amb = 2 C unless otherwise specified) Parameter Test Conditions Min Typ. Max. Unit 1 Output oltage =24 I 01 = Output oltage =24 I 02 = Output oltage =24 I 03 = Temperature Stability ll Outputs m/ C Input oltage I 01 =2. I 02/3 = I 01 Output Current = I 02 Output Current =24.1 I 03 Output Current =24.1 I SC verage Input Current =40 UT1 =O I SC verage Input Current =40 UT1/2/3 =O 0.4 I r Reflected line =24 I 01 =2. i 02 =0.1 i 03 = m f S Switching Frequency khz Efficiency =24 I 01 =2. I 02 =0.1 I 03 =0.1 7 % Æ Line Regulation I 01 =2. =1 to 2 I 02 =0.1 I 03 =0.1 2 m/ Æ Load Regulation =24 I 01 =. to 2.. =24 02 =.0 to.1 =24 03 =.0 to m/ m/ m/ SR Supply Rejection 0/60 Hz 4 m/ r Ripple oltage =24 01 =2. 30 m n Noise oltage =24 01 =2. 40 m I rh Reset Leakage Current µ ri Reset Low Level I Reset = m T rd Reset Delay Time ms T r1 Line Transient Recovery Time I 01 =2. =1 to 3 µs T r2 Load Transient Recovery Time =24 I 0 =. to µs R th Thermal Resistance C/W RS Components Issued ugust

7 Printed Circuit Drilling (Components Side)