- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄225340 > TPS65270RGET (TEXAS INSTRUMENTS INC) DUAL SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PQCC24 PDF資料下載
參數(shù)資料
| 型號： | TPS65270RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, PLASTIC, VQFN-24 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 1432K |
| 代理商： | TPS65270RGET |
2
C
M
ps
fc Vo Co
R
g
Vref gm
p ×
×
=
×
2
C
M
ps
fc Co
R
g
gm
p ×
×
=
×
L
c
R
Co
C
R
×
=
L
c
R
Co
C
R
×
=
1
2
O
L
fp
C
R
p
=
×
Re
Roll
C
sr Co
C
R
×
=
Re
Roll
C
sr Co
C
R
×
=
1
2
Roll
C
Roll
fp
R
C
p
=
×
1
2
ff
C
fz
R
p
=
×
SLVSAX7
– AUGUST 2011
To calculate the external compensation components follow the following steps:
TYPE II CIRCUIT
TYPE III CIRCUIT
Select switching frequency that is appropriate for
application depending on L, C sizes, output ripple, EMI
concerns and etc. Switching frequencies between 500 kHz
Use type III circuit for switching
and 1 MHz give best trade off between performance and
frequencies higher than 500 kHz.
cost. When using smaller L and Cs, switching frequency
can be increased. To optimize efficiency, switching
frequency can be lowered.
Select cross over frequency (fc) to be less than 1/5 to 1/10
Suggested
of switching frequency.
fc = fs/10
Set and calculate Rc.
Calculate Cc by placing a compensation zero at or before
the converter dominant pole
Add CRoll if needed to remove large signal coupling to high
impedance COMP node. Make sure that
is at least twice the cross over frequency.
Calculate Cff compensation zero at low frequency to boost
the phase margin at the crossover frequency. Make sure
NA
that the zero frequency (fzff is smaller than soft start
equivalent frequency (1/Tss).
Slope Compensation
The device has a built-in slope compensation ramp. The slope compensation can prevent sub harmonic
oscillations in peak current mode control when duty cycle becomes too large.
Over Current Protection
The current through the internal high side MOSFET is sampled and scaled through an internal pilot device during
the hig time. The sampled current is compared to over current limit. If the peak inductor current exceeds the over
current limit reference level, an internal over current fault counter is set to 1 and an internal flag is set. The
internal power MOSFET is immediately turned off and will not be turned on again until the next switching cycle.
The protection circuitry continues to monitor the current and turns off the internal MOSFET as described. If the
overcurrent condition persists for four sequential clock cycles, the over-current fault counter overflows indicating
an overcurrent fault condition exists. The regulator is shut down and power good goes low. If the overcurrent
condition clears prior to the counter reaching four consecutive cycles, the internal flag and counter are reset. The
protection circuitry attempts to recover from the overcurrent condition after waiting four soft-start cycles. The
internal overcurrent flag and counter are reset. A normal soft-start cycle is attempted and normal operation
continues if the fault condition has cleared. If the overcurrent fault counter overflows during soft-start, the
converter shuts down and this hiccup mode operation repeats.
Thermal Shutdown
The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 160
°C.
The thermal shutdown forces the device to stop switching when the junction temperature exceeds thermal trip
threshold. Once the die temperature decreases below 140
°C, the device reinitiates the power up sequence. The
thermal shutdown hysteresis is 20
°C.
14
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS65270
相關PDF資料 |
PDF描述 |
|---|---|
| TPS65562RGTTG4 | 3 A BATTERY CHARGE CONTROLLER, PQCC16 |
| TPS65735RSNR | SPECIALTY ANALOG CIRCUIT, PQCC32 |
| TPS70702PWP | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| TPS70745PWP | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
| TPS70751PWP | DUAL-OUTPUT LOW-DROPOUT VOLTAGE REGULATORS WITH POWER UP SEQUENCING FOR SPLIT VOLTAGE DSP SYSTEMS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS65273VDAPR | 制造商:Texas Instruments 功能描述:JEJU 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ DL |
| TPS65273VTEVM | 制造商:Texas Instruments 功能描述:EVM FOR TPS65273V TSSOP - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:EVALUATION BOARD FOR TPS65273 |
| TPS65276VDAPR | 制造商:Texas Instruments 功能描述:JEJU 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ DL |
| TPS65276VRHHR | 功能描述:Buck Switching Regulator IC Positive Programmable 0.68V 2 Output 6A, 3.5A 36-VFQFN Exposed Pad 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:降壓 輸出配置:正 拓撲:降壓 輸出類型:可編程 輸出數(shù):2 電壓 - 輸入（最小值）:4.5V 電壓 - 輸入（最大值）:18V 電壓 - 輸出（最小值/固定）:0.68V 電壓 - 輸出（最大值）:1.95V 電流 - 輸出:6A，3.5A 頻率 - 開關:200kHz ~ 1.6MHz 同步整流器:是 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤 供應商器件封裝:36-VQFN（6x6） 標準包裝:1 |
| TPS65276VTEVM | 制造商:Texas Instruments 功能描述:EVM FOR TPS65276V TSSOP - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:EVALUATION BOARD FOR TPS65276 |
發(fā)布緊急采購，3分鐘左右您將得到回復。