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NCP5010 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP5010 Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 18 page  NCP5010 http://onsemi.com 11 Finally an acceptable DCR must be selected regarding losses in the coil and must be lower than 1.4 W to limit excessive voltage drop. In addition, as DCR is reduced, overall efficiency will improve. Some recommended inductors include but are not limited to: TDK VLF4012AT−220MR51 TDK VLP4612T−220MR34 TDK VLP5610T−220MR45 Coilcraft LPO6610−223M Coilcraft DO1605T−223MX Coilcraft DT1608C−223 Capacitor Selection To minimize the output ripple, a low ESR multi−layer ceramic capacitor type X5R or equivalent should be selected. For LED driver applications a 1 mF (min) 25 V is adequate. The NCP5010 can be operated in a voltage mode configuration (see Figure 34) for applications such as OLED power. Under these conditions, COUT can be increased to 2.2 mF, 25 V or more to reduce the output ripple. The input needs to be bypassed by a X5R or an equivalent low ESR ceramic capacitor near the VIN pin. A 1 mF, 6.3 V is enough for most applications. However, if the connection between VIN and the battery is too long then a 4.7 mF or higher ceramic capacitor may be needed. Some recommended capacitors include but are not limited to: TDK C1608X5R1E105MT TDK C2012X5R1E105MT TDK C1608X5R0J105MT TDK C2012X5R1E225MT Murata GRM185R61A105KE36D Murata GRM188R60J475KE19D Murata GRM216R61E105KA12D Short−Circuit Protection If VOUT is falls below 50% of VIN then a short−circuit condition is detected. When this event is detected, the PWM circuitry is disabled and the NMOS power switch is not turned on. Power will be supplied to the load through the inductor, rectifier and high side switch. Once VOUT reaches 66% of VIN, then the PWM circuitry is enabled. In normal conditions when the device is enabled by an active high signal on CTRL, the short circuit condition continues until the output capacitor is charged by the limited current up to 66% of VIN. Normal Running Short−Circuit Condition Current limited at 20mA Converter in Standby End of Short−Circuit Detected Converter Starts Again SC Occurs T Figure 27. Example of the VOUT Voltage Behavior When Short−Circuit Arises VOUT 2/3 VIN 1/2 VIN Overvoltage Protection (OVP) If there is an open load condition such as a loose connection to the White LED string, the converter will provide current to the Cout capacitor and the voltage at the output will rise rapidly. This could cause damage to the part if there was not some external clamping Zener clamping circuit. To eliminate the need for these external components, the NCP5010 incorporates an OVP circuit which monitors the output voltage with a resistive divider network and a comparator and voltage reference. If the output reaches 22 V (nominal), the OVP circuit will detect a fault and inhibit PWM operation. This comparator has 1 V of hysteresis so when the load is reconnected and the voltage drops below 21 V, the PWM operation will resume automatically. The 22 V OVP threshold allows the use of 25 V ceramic capacitors for the output filter capacitor. Undervoltage Lock Out (UVLO) To ensure proper operation under all conditions, the device has a built−in undervoltage lock out (UVLO) circuit. During power−up, the device will remain disabled until the input voltage exceeds 2.4 V nominal. This circuit has 200 mV of hysteresis to provide noise immunity to transient conditions. |
Similar Part No. - NCP5010_06 |
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Similar Description - NCP5010_06 |
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