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參數(shù)資料
| 型號： | TPS40054QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 25/28頁 |
| 文件大小： | 571K |
| 代理商： | TPS40054QPWPRQ1 |
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TPS40054-Q1, TPS40055-Q1, TPS40057-Q1
SLAS482A – AUGUST 2005 – REVISED NOVEMBER 2005
DEVICE INFORMATION (continued)
TERMINAL FUNCTIONS (continued)
TERMINAL
I/O
DESCRIPTION
NAME
NO.
Current limit pin used to set the overcurrent threshold. An internal current sink from this pin to ground sets a
ILIM
16
I
voltage drop across an external resistor connected from this pin to VCC. The voltage on this pin is compared to
the voltage drop (VIN -SW) across the high side MOSFET during conduction.
A resistor is connected from this pin to VIN to program the amount of voltage feed-forward. The current fed into
KFF
1
I
this pin is internally divided and used to control the slope of the PWM ramp.
Gate drive for the N-channel synchronous rectifier. This pin switches from BP10 (MOSFET on) to ground
LDRV
10
O
(MOSFET off).
Power ground reference for the device. There should be a low-impedance path from this pin to the source(s) of
PGND
9
–
the lower MOSFET(s).
RT
2
I
A resistor is connected from this pin to ground to set the internal oscillator and switching frequency.
SGND
5
–
Signal ground reference for the device
Soft-start programming pin. A capacitor connected from this pin to ground programs the soft-start time. The
capacitor is charged with an internal current source of 2.3 A. The resulting voltage ramp on the SS pin is used
as a second non-inverting input to the error amplifier. The output voltage begins to rise when VSS/SD is
approximately 0.85 V. The output continues to rise and reaches regulation when VSS/SD is approximately
SS/SD
6
I
1.55 V. The controller is considered shut down when VSS/SD is 125 mV or less. All internal circuitry is inactive.
The internal circuitry is enabled when VSS/SD is 210 mV or greater. When VSS/SD is less than approximately
0.85 V, the outputs cease switching and the output voltage (VOUT) decays while the internal circuitry remains
active.
This pin is connected to the switched node of the converter and used for overcurrent sensing. The TPS40054
SW
12
I
and TPS40057 versions use this pin for zero current sensing as well.
Synchronization input for the device. This pin can be used to synchronize the oscillator to an external master
SYNC
4
I
frequency. If synchronization is not used, connect this pin to SGND.
Inverting input to the error amplifier. In normal operation, the voltage on this pin is equal to the internal
VFB
7
I
reference voltage, 0.7 V.
VIN
15
I
Supply voltage for the device
6
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