CS5157 ON Semiconductor, CS5157 Datasheet
CS5157
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CS5157 Summary of contents
Page 1
... It is designed to provide unprecedented transient response for today’s demanding high−density, high−speed logic. The regulator operates using a proprietary control method, which allows a 100 ns response time to load transients. The CS5157 is designed to operate over a 4.25−16 V range (V ) using power the IC and 5 the main supply for conversion ...
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... ID1 ID1 V V ID2 ID2 V V ID3 ID3 V V ID4 ID4 CS5157 C OFF 330 pF SS 0.1 μF COMP 0.33 μF LGND Figure 1. Application Diagram, Switching Power Supply for Core Logic − Pentium ABSOLUTE MAXIMUM RATINGS* Operating Junction Temperature Lead Temperature Soldering: Storage Temperature Range, T ...
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ELECTRICAL CHARACTERISTICS (0°C < T Code ID4 ID2 ID1 ID0 ID3 Characteristic Error Amplifier V Bias Current Open Loop Gain 1.25 V < V Unity ...
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ELECTRICAL CHARACTERISTICS (continued) Code ID4 ID2 ID1 ID0 ID3 Characteristic DAC Input Threshold V ID0, Input Pull Up Resistance V ID0, Pull Up Voltage Accuracy Measure V V ...
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ELECTRICAL CHARACTERISTICS (continued) Code ID4 ID2 ID1 ID0 ID3 Characteristic Supply Current I No Switching CC1 I No Switching CC2 Operating I V CC1 FB Operating I V ...
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V Monitor CC1 Comparator − V CC1 + 3.90 V 3.85V SS V ID0 Error V ID1 Amplifier 5 BIT + V DAC ID2 V − ID3 PWM Comparator V ID4 Slow Feedback V FB COMP Fast Feedback V FFB ...
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... 100 mV steps, the second steps, depending on the digital input code. If all five bits are left open, the CS5157 enters adjust mode. In adjust mode, the designer can choose any output voltage by using resistor divider feedback to the V and V pins traditional controllers ...
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... Trace 3− Input (V and V ) (5.0 V/div.) CC1 CC2 Trace 4− 5.0 V Input (1.0 V/div.) Figure 4. CS5157 Demonstration Board Startup in Response to Increasing 12 V and 5.0 V Input Voltages. Extended Off Time is Followed by Normal Off Time Operation when Output Voltage Achieves Regulation to the Error Amplifier Output. M 2.50 ms Trace 1− ...
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... Trace 1− Regulator Output Voltage (1.0 V/div.) Trace 2− Inductor Switching Node (5.0 V/div.) Trace 3− Output Current (13 to 0,5 Amps) (10 A/div.) Figure 11. CS5157 Demonstration Board Response Load Turn Off (Output Set for 2.8 V). V Topology Immediately Connects Inductor to Ground, Providing 0% Duty Cycle. Regulation is Achieved in ...
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... Trace 4− 5.0 V Supply Voltage (2.0 V/div.) Trace 3− Soft Start Timing Capacitor (1.0 V/div.) Trace 2− Inductor Switching Node (2.0 V/div.) Figure 12. CS5157 Demonstration Board Hiccup Mode Short Circuit Protection. Gate Pulses are Delivered While the Soft Start Capacitor Charges, and Cease During Discharge < ...
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... Trace 2− Power Good Signal (2.0 V/div.) Figure 18. CS5157 Demonstration Board During Power Up. Power Good Signal is Activated when Output Selecting External Components SS The CS5157 can be used with a wide range of external CS5157 power components to optimize the cost and performance of a particular design. The following information can be used FFB as general guidelines to assist in their selection ...
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... A Schottky diode may be placed in parallel with the synchronous MOSFET to conduct the inductor current upon turn off of the switching MOSFET to improve efficiency. The CS5157 reference circuit does not use this device due to it’s excellent design. Instead, the body diode of the synchronous MOSFET is utilized to reduce cost and conducts the inductor current. For a design operating at 200 kHz or so, the low non− ...
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A heatsink may be added to TO−220 components to reduce their thermal impedance. A number of PC board layout techniques such as thermal vias and additional copper foil area can be used to improve the power handling capability of surface ...
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... ID3 CS5157 V ID4 C OFF 330 pF SS 0.1 μF COMP LGND 0.33 μF Figure 24. Additional Application Diagram, 3 2.5 V/7.0 A Converter with 12 V Bias 1.0 μF 1.0 μF Si4410DY V CC2 V GATE(H) V GATE(L) CS5157 PGND FFB LGND 100 pF CC2 Si9410 V GATE( GATE(L) PGND 3 FFB 100 pF http://onsemi ...
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... ID4 C OFF 330 pF SS 0.1 μF COMP 0.33 μF Figure 25. Additional Application Diagram, 5 3.3 V/10 A Converter with Current Sharing 1.0 μF 1.0 μF Si4410 V CC2 V GATE( CS5157 V GATE(L) PGND 3 FFB LGND 100 pF http://onsemi.com 15 + 1200 μF/10 V × 3 AIEI Remote Sense 3.0 μH 3.3 V/10 A 100 μF/10 V × Ω ...
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... D 0.35 0.49 0.014 0.019 F 0.40 1.25 0.016 0.049 G 1.27 BSC 0.050 BSC J 0.19 0.25 0.008 0.009 K 0.10 0.25 0.004 0.009 5.80 6.20 0.229 0.244 R 0.25 0.50 0.010 0.019 Unit °C/W °C/W ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CS5157 ...