參數(shù)資料
型號： TPS40180RGER
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁數(shù)： 18/52頁
文件大?。?/td> 1291K
代理商： TPS40180RGER
www.ti.com
VDD
UVLO
> 2.5 V
PGOOD
20 V
Settle Time
V
VDD+2 V
V
VDD+4 V
V
VDD
‘0’ programmed to bit 0
‘1’ programmed to bit 1
>=15 ms
15 ms write EEPROM
1ms
>8ms
A5 A4 A3 A2 A1 A0 D
1ms
>10ms
UDG-07032
0
1
A5
A4
A3
A2
A1
A0
D
UDG-07038
100 ns
‘0’
900 ns
1 ms
‘1’
UDG-07037
Using the Device for Clock Master/Slave Operation
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
Figure 28. eTrim EEPROM Programming Sequence
The pulses from VVDD + 2 V to VVDD + 4 V on UVLO are governed by the timing shown in Figure 29.
Note that there are six address bits in the sequence to write to a single EEPROM bit. To write to the eTrim
accessible bits, the address sequence must be correct for all six bits or else the write attempt has no effect. To
write to eTrim accessible bits the first four address bits must be zero. Anything else is not accepted. Address
bits A1 and A0 select which eTrim accessible EEPROM bit is written. For example, to write a 1 to bit 3 of the
eTrim accessible bits, the data pulse sequence would look like Figure 30.
Figure 29. eTrim Bit Pulse Timing
Figure 30. Write 1 to Bit 3
As data is clocked into the device, the reference voltage reflects the updates without writing the data buffer to the
actual EEPROM. System measurements can be made after a suitable system dependent settling time has
elapsed after changing the bits in the buffer. When satisfied with the results, the EEPROM may be written by
pulling PGOOD to 20 V and UVLO to V(VDD) + 4 V for at least 15 ms. For best reliability, the EEPROM should
only be written to by pulling PGOOD to 20V and UVLO to V(VDD) + 4V a maximum of three times during the
product lifetime. This writing only needs to be done once during the entire trimming cycle, after the optimal trim
values are found since data clocked in will affect the output without perfoming the actual write. Until written,
changes are not permanent and will be lost after power cycling the device.
The TPS40180 can be operated as either a master clock source or a slave to a master clock.
Copyright 2007, Texas Instruments Incorporated
25
Product Folder Link(s): TPS40180
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