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參數資料
| 型號： | TPS51511RHLT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, QFN-20 |
| 文件頁數： | 8/29頁 |
| 文件大?。?/td> | 1019K |
| 代理商： | TPS51511RHLT |
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Advanced PGOOD Mask
APPLICATION INFORMATION
LOOP COMPENSATION AND EXTERNAL PARTS SELECTION
Current Mode Operation
VoltageDivider
R1
R2
Gm=300 S
m
Filter
0.75V
COMP
Rc
Cc
Cc2
Ro=75M
Error Amplifier
SwitchingModulator
Ref
PWM
Control
Logic
and
Driver
VOSW
VIN
DRVH
DRVL
CS
PGND
Lx
RL
CO
RS
ESR
SLVS735A – FEBRUARY 2007 – REVISED APRIL 2007
Table 1. OD and ODOFF Functions
ENLDO
ENSW
ODOFF(1)
OD(2)
Applications(3)
> 1.25 V
Off
D
0.716 V < ODOFF < 1.25 V and lasts longer than 45
s
Off
D&G
Hi
X
0.716 V < ODOFF < 1.25 V and lasts less than 45
s
Keep State
G
0.678 V < ODOFF < 0.716 V
Keep State
G
< 0.678 V
On
D&G
> 1.25 V
Off
D
Lo
Hi
< 1.25 V
On
D&G
Lo
X
On
G
(1)
All voltages are typical values.
(2)
"Keep state" means no state change with previous state, “On” means open drain MOSFET is turned on and OD is connected to ground
through this MOSFET. “Off” means open drain MOSFET off.
(3)
“D” stands for dynamic voltage change “G” stands for LDO PGOOD .
The advanced PGOOD mask feature allows the switcher to dynamically change the output voltage while
maintaining the PGOOD and OVP functions during the transition.
During the dynamic voltage change, if the output voltage is lower than 1.36 V (typ) the high-end PGOOD
comparator and OVP comparator is masked. If the output voltage is set equal to or higher than 1.36 V (typ), the
blanking circuit is disabled, and the high-end PGOOD threshold is set to 110%, and the OVP threshold is set to
115% of the output-voltage setting . When dynamic voltage change is implemented, a 1-nF ceramic capacitor
must be added in parallel with the top resistor of the voltage divider as shown in Figure 27.
A buck converter using TPS51511 current mode operation can be partitioned into three portions, a voltage
divider, an error amplifier and a switching modulator. By linearizing the switching modulator, we can derive the
transfer function of the whole system. Since the current-mode scheme directly controls the inductor current, the
modulator can be linearized as shown in Figure 25.
Figure 25. Simplified Current-Mode Functional Blocks
In this representation, the inductor is located inside the local feedback loop, and its inductance does not appear
in the small-signal model. As a result, a modulated current source including the power inductor can be modeled
16
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| TPS51511RHLTG4 | 功能描述:DC/DC 開關控制器 Synch Switcher Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS51513 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINGLE PHASE D-CAP+ SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED DRIVERS FOR GENERAL IC VCORE APPLICATIONS |
| TPS51513EVM-549 | 功能描述:電源管理IC開發工具 TPS51513EVM-549 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS51513EVM-549 | 制造商:Texas Instruments 功能描述:DEVELOPMENT TOOL |
| TPS51513RHB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SINGLE PHASE D-CAP+ SYNCHRONOUS BUCK CONTROLLER WITH INTEGRATED DRIVERS FOR GENERAL IC VCORE APPLICATIONS |
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