 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
TPS65520 Datasheet(PDF) 32 Page - Texas Instruments |
|
||||||||||||||||||||||||||||||
TPS65520 Datasheet(HTML) 32 Page - Texas Instruments |
|
|
32 / 61 page  www.ti.com + + − 0.85[V] DAC Vout7 GND_REG GND_REG GND_REG + + − MAX DUTY TRIM_DTCR1, TRIM_DTCF1 VCH3 VCC7 SS_SYNC ERR7 CERR7 SSSYNC L7 CCH7 VCC_GD GND_GD Dmax7 VCH3 GND_GD EN7S GND_REG GND_REG OVP SCP VCH3 VCH3 VCH3 VOS71 VOS72 VOS73 VCH7 MODE7 PM71 NM71 CH-8 TPS65520 SLVS557A – MARCH 2005 – REVISED MARCH 2005 Figure 24. CH-7 Block Diagram (Step-down) As shown in Figure 24, the step-down circuit configuration uses CH-3 as an input power supply that assures a voltage higher than the output voltage. CH-7 has the VOS71 pin for controlling a separate PMOS switch, preventing the input voltage from appearing on the output side when the channel is turned off (MODE7 = H). Without the switch, the parasitic diode in the external PMOS would carry the input voltage from coil L7 and cause a current to flow into the load. This switch turns on or off according to the settings in the CH7-SW control register. When CH-7 is activated, CH-8 supplies power to CH-7. To prevent overload on CH-8 during startup, CH-7 compares VCH8 and VCH7 and performs asynchronous rectification using a body diode until VCH7 exceeds VCH8. CH-7 supports the OVP, SCP and soft start functions. The soft start function is common to CH-1, CH-4, and CH-7. When CH-7 is not used, handle the pins as shown below. CH-7 will enter Step-down mode with its state equal to the stable output state, stopping operation. PIN HANDLING ERR7 0.1 µF - Connect a 0.1-µF capacitor between the pin and the ground VCH7 VCH1 - Short-circuit to VCH1 VOS71 Open MODE7 Short-circuit to the ground VCC7 Open VOS72 Open VOS73 Open CH-8 is a step-up switching regulator for LDO-1, LDO-2, LDO-3, LDO-4, and the internal power supplies of the TPS65520. CH-8 is a 3.6-V output regulator and outputs the input voltage (VCC8) when it is higher than 3.6 V. CH-8 is turned on whenever the battery and/or ac adaptor is connected. It operates in Skip mode while the PWR_ON pin is low, meaning that only the Sub-CPU real-time clock is operating. Once the PWR_ON pin is driven high, CH-8 enters Synchronous rectification mode, where it can supply the maximum load current. CH-8 has a startup circuit that can start with a low input voltage because the startup of CH-8 enables the entire DSC system to start up. It outputs 3.6 V from a minimum input voltage (VCC8) of 1.6 V. 32 |
Similar Part No. - TPS65520 |
|
Similar Description - TPS65520 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
