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參數(shù)資料
| 型號(hào)： | TPS56121DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO22 |
| 封裝： | ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數(shù)： | 2/25頁 |
| 文件大?。?/td> | 653K |
| 代理商： | TPS56121DQPT |
0
0.4
0.8
1.2
1.6
In
p
u
t
V
o
lt
a
g
e
(V
)
Time (ms)
2.0
Calibration
Time(1.9 ms)
0.7 V
1.3 V
V
SS_INT
V
EN/SS
SLUSAH4
– MARCH 2011
APPLICATION INFORMATION
Introduction
The TPS56121 is a 15-A high performance synchronous buck converter with two integrated N-channel
NexFET
power MOSFETs. The device implements a voltage-mode control with voltage feed-forward
compensation that responds instantly to input voltage change. Pre-bias capability eliminates concerns about
damaging sensitive loads.
Voltage Reference
The 600-mV bandgap cell is internally connected to the non-inverting input of the error amplifier. The reference
voltage is trimmed with the error amplifier in a unity gain configuration to remove amplifier offset from the final
regulation voltage. The 1% tolerance on the reference voltage allows the user to design a very accurate power
supply.
Figure 19. Startup Sequence and Timing
Enable Functionality, Startup Sequence and Timing
After input power is applied, an internal 40-
μA current source begins to charge the soft-start capacitor connected
from EN/SS to GND. When the voltage across that capacitor increases to 0.7 V, it enables the internal BP
regulator followed by a calibration. Total calibration time is approximately 1.9 ms. See Figure 19. During the
calibration, the device performs the following two functions.
COMP Pin Impedance Sensing
The device samples the impedance at the COMP pin and determines the appropriate operating switching
frequency. If there is no resistor connected from the COMP pin to GND, the switching frequency is set to the
default value of 500 kHz. If a resistor of 40.2 k
Ω ± 10% is connected from the COMP pin to GND, the switching
frequency is set to 300 kHz. Alternatively, if a resistor of 13.3 K
± 10% is connected from the COMP pin to GND,
the switching frequency is set to 1 MHz.
After a 1.1-ms time period, the COMP pin is then brought low for 0.8 ms. This ensures that the feedback loop is
preconditioned at startup and no sudden output rise occurs at the output of the converter when it is allowed to
start switching.
Overcurrent Protection (OCP) setting
The device sources 10
μA (typical) to the resistor connected from the ILIM pin to GND. The voltage developed
across that resistor multiplied by a factor of 2 is then sampled and latched off internally as the OCP trip level for
the low-side FET until one cycles the input or toggles the EN/SS.
The voltage at EN/SS is internally clamped to 1.3 V before and/or during calibration to minimize the discharging
10
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s) :TPS56121
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