GS-R24F0502.0

GS-R24F 2A DC/DC converter modules Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ MTBF 1 000 000 hours (TA = 25° C) 2A max output current 35V max input voltage 1.5V max drop-out voltage Remote logic inhibit/enable Synchronization Not-latching overload and short circuit protection Thermal shutdown Fixed or adjustable output No heatsink required Operating temperature range -25°C ÷ 85°C Description The GS-R24F series is a family of high efficiency step down switching voltage regulator, designed to replace linear regulators. Based on ST L5973 device, these non isolated regulators are suitable for various applications, including telecom, industry, computer and distributed power supply system having a wide range input voltage. Order codes Part number GS-R24F0182.0 GS-R24F0252.0 GS-R24F0332.0 GS-R24F0502.0 GS-R24F0002.0 GS-R24F1201.5 GS-R24F0001.0 Output Voltage [V] 1.8 ± 4% 2.5 ± 4% 3.3 ± 4% 5.0 ± 4% 1.235 ÷ 5.5 12 ± 4% 3.3 ÷ 24 Input Voltage [V] 16 ÷ 35 16 ÷ 35 16 ÷ 35 16 ÷ 35 16 ÷ 35 16 ÷ 35 16 ÷ 35 Output Ripple [mVpp] 25 25 25 25 25 100 100 ÷ 250 Efficiency [%] 72 76 82 85 68 ÷ 85 91 78 ÷ 96 Notes Fixed output voltage Fixed output voltage Fixed output voltage Fixed output voltage Progr. output voltage Fixed output voltage Progr. output voltage October 2006 Rev 1 1/12 www.st.com 12 Contents GS-R24F Contents 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 1.2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 2.2 2.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal de-rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Reference voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Multiple units synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Output voltage programming (GS-R24F0002.0 and GS-R24F0001.0) 7 Loop compensation (GS-R24F0002.0 and GS-R24F0001.0) . . . . . . . . . . 7 5 Additional features and protections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1 Output overvoltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 7 Ordering scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2/12 GS-R24F Pin settings 1 1.1 Pin settings Pin connection Figure 1. Pin connection and mechanical data (dimensions in mm) 1.2 Pin description Table 1. Name 1 2 3 4 5 6 7 8 9 10 11 12 Pin description Function INH Vref Input + Input + Input GND Input GND Output GND Output GND Vout Vout FB Sync Description A logic high level disables the device. When the pin is open, an internal pull up disables the device 3.3V reference voltage DC input voltage DC input voltage Return for input voltage source Return for input voltage source Return for output voltage source Return for output voltage source Regulated power output Regulated power output Feedback input, available on adjustable device and on request for additional compensation Master/Slave synchronization 3/12 Maximum ratings GS-R24F 2 2.1 Maximum ratings Absolute maximum ratings Table 2. Symbol VI IOUT V1 V12 V11 DC input voltage Maximum output current INH Sync FB Absolute maximum ratings Parameter Value 36 internally limit -0.3 to VI -0.3 to 4 4 V V V Unit V 2.2 Thermal data Table 3. Symbol Tstg Top Absolute maximum ratings Parameter Storage temperature range Operating ambient temperature Value -40 ÷ 105 -25 ÷ 85 Unit °C °C 2.3 Thermal de-rating Table 4. Symbol Thermal de-rating for free air condition (all versions) Parameter Test condition VI = 16 ÷ 35V --------TA = 60°C VI = 16 ÷ 35V---------TA = 65°C Value 1.95 1.85 1.75 A 1.65 1.55 1.40 Unit Io Output current VI = 16 ÷ 35V ---------TA = 70°C VI = 16 ÷ 35V ---------TA = 75°C VI = 16 ÷ 35V ---------TA = 80°C VI = 16 ÷ 35V ------ --TA = 85°C 4/12 GS-R24F Electrical characteristics 3 Electrical characteristics TA = 25°C, unless otherwise specified Table 5. Symbol Vr Vr Vr Electrical characteristics (all version) Parameter Ripple voltage Ripple voltage Ripple voltage Temperature stability Test condition VI =24V Io = 2A for GS-R24Fyyy2.0 VI =24V Io = 1.5A for GS-R24F1201.5 VI =24V Io = 1A for GS-R24F0001.0 VI =Vo + 1.5V Io = 2A VI =16 ÷ 35V for GS-R24Fyyy2.0 VI =16 ÷ 35V for GS-R24F1201.5 VI =16 ÷ 35V for GS-R24F0001.0 VI =16 ÷ 35V VI =24V Io = 0A 0 0 0 2.5 1.8 80 225 3.234 8 Device ON 250 3.3 10 2.5 150 275 3.366 30 0.8 2.2 1.22 1.235 1.25 2 1.5 1 100 Min Typ 25 Max 35 100 250 Unit mVpp mVpp mVpp mV/°C A A A A mA µA kHz V mA V V V mV/V Case to ambient °C/W Io Io Io IoL Iq Iqst-by fs Vref Output current Output current Output current Current limit Quiescent current Total stand-by quiescent Vinh>2.2V Vi = 35V current Switching frequency Reference voltage Short circuit current INH threshold voltage Device OFF Feedback voltage Supply voltage rejection Thermal resistance Vi=16 ÷ 35V IO=0 ÷ 2A VI = 24V Io = 2A VI = 16 ÷ 35V Iref = 0 ÷ 5mA INH VFB SRV Rth 5/12 Application information GS-R24F 4 4.1 Application information Input voltage The recommended maximum operating DC Input Voltage is 35V including ripple voltage. 4.2 Reference voltage No capacitor is required for stability. 4.3 Inhibit function The inhibit feature allows to put the device in stand-by mode. With INH pin 1 is higher than 2.2V the device is disabled and the current consumption is reduced to less than 150µA for VI = 35V. With INH pin lower than 0.8V, the device is enabled. If the INH pin is left floating, an internal pull up ensures that the voltage at the pin reaches the inhibit threshold and the device is disabled. The pin can be pulled to VI to disable the device. 4.4 Multiple units synchronization Using more than one unit on the same circuit, it is possible to synchronize the switching frequency, connecting all pin 12 together (see Figure 4). The unit with higher frequency becomes the master. 4.5 Current limitation The device has two current limit protections, pulse by pulse and frequency fold back. The current is sensed through a resistor and if it reaches the threshold, the on time is reduced and consequently the output voltage, too. Since the minimum switch ON time (necessary to avoid false overcurrent signal) is not enough to obtain a sufficiently low duty cycle at 250Hz, the output current could increase again, in strong overcurrent or short circuit conditions. For this reason the switching frequency is also reduced to keep the inductor current within its maximum threshold limit. The frequency depends on the feedback voltage. As the feedback voltage decreases (due to the reduced duty cycle), the switching frequency decrease too. 6/12 GS-R24F Application information 4.6 Thermal shutdown The shutdown block generates a signal that turns off the power stage if the temperature of the internal chip goes higher than a fixed internal threshold (150° C min). The sensing element of the chip is very close to the PDMOS area, so ensuring an accurate and fast temperature detection. An hysteresis of approximately 20° C avoids that the devices turns on and off continuously. 4.7 Output voltage programming (GS-R24F0002.0 and GS-R24F0001.0) The GS-R24F0002.0 output voltage is 5.54V ±4%, the GS-R24F0001.0 output voltage is 24.44V ±4%, to reduce these values connect a resistor between pin 11 (FB) and pin 10 (Vout). The resistor must be located very close to the proper pins, to minimize the injected noise (see figure 2). The resistor value is calculated using the following formula: for GS-R24F0002.0 Rv = [(Vout - 1.235) * 11.3] / (5.54 - Vout) --[kΩ]; for GS-R24F0001.0 Rv = [(Vout - 1.235) * 62] / (24.44 - Vout) --[kΩ]. Vout can be adjusted between 1.235V (Rv = 0Ω) and 5.54V/24.44V (Rv = open). 4.8 Loop compensation (GS-R24F0002.0 and GS-R24F0001.0) If required by particular load conditions, it is possible to change the feedback loop compensation, adding an external capacitor between pin 11 (FB) and pin 10 (Vout), which will act as speed up (see Figure 3). 7/12 Additional features and protections GS-R24F 5 5.1 Additional features and protections Output overvoltage protection The overvoltage protection, OVP, is realized by using an internal comparator, whose input is connected to the feedback. It turns off the power stage when the OVP threshold is reached. This threshold is typically 30% higher than the feedback voltage. Figure 2. Output voltage programming Figure 3. Loop compensation Figure 4. Multiple units synchronization 8/12 GS-R24F Figure 5. P.C.B. Footprint (dimensions in mm) Additional features and protections 9/12 Ordering scheme GS-R24F 6 Ordering scheme Table 6. Ordering information scheme GSR24 F018 2.0 Input Voltage 24 = 24V Output Voltage 018 = 1.8V 025 = 2.5V 033 = 3.3V 050 = 5.0V 120 = 12V 000 = 1.235 ÷ 5.5V / 3.3 ÷ 24V Output Current 2.0 = 2A 1.5 = 1.5A 1.0 = 1A 10/12 GS-R24F Revision history 7 Revision history Table 7. Date 13-Oct-2006 Revision history Revision 1 Initial release Changes 11/12 GS-R24F Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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