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參數(shù)資料
| 型號： | TCV7101F(TE12L,Q) |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 5 X 5 MM, 1.27 MM PITCH, PLASTIC, HSON-8 |
| 文件頁數(shù)： | 16/17頁 |
| 文件大?。?/td> | 461K |
| 代理商： | TCV7101F(TE12L,Q) |
TCV7101F
2010-03-18
8
Rectifier Selection
A low-side switch or Schottky barrier diode should be externally connected to the TCV7101F.
It is recommended that an N-channel MOSFET TPC6007-H, TPC6012 (T5LS,F) or equivalent be on as a
low-side switch. (Please input by 4.5V or more and use the voltage of the drive at the gate when it uses
TPC6007-H.) And N-channel MOSFET of a different type can also be used. However, if the switching speed of the
external MOSFET is low, a shoot-through current may flow due to the simultaneous conduction of high-side and
low-side switches, leading to device failure. Thus, observe the waveform at the LX pin while operating the
TCV7101F with a current close to the rated value to make sure that there is a dead time (the period between the
time when the low-side switch is turned off and the high-side switch is turned on) of more than 10 ns. Thorough
evaluation is required to ensure that the TCV7101F provides an appropriate dead time even when in the
end-product environment.
As for the Schottky barrier diode, the CMS05 is recommended to be used. Using a Schottky barrier diode tends
to lead to a large voltage overshoot on the LX pin. Thus, a series RC filter consisting of a resistor of RS = 10 Ω and
a capacitor of CS = 220 pF should be connected in parallel with the Schottky barrier diode. Power loss of a
Schottky barrier diode tends to increase due to an increased reverse current caused by the rise in ambient
temperature and self-heating due to a supplied current. The rated current should therefore be derated to allow
for such conditions in selecting an appropriate diode.
Soft-Start Feature
The TCV7101F has a soft-start feature.
If the SS pin is left open, the soft-start time, tSS, for VOUT defaults to 1 ms (typ.) internally.
The soft-start time can be extended by adding an external capacitor (CSS) between the SS and GND pins. The
soft-start time can be calculated as follows:
SS
SS2
C
1
.
0
t
=
(7)
tSS2: Soft-start time (in seconds) when an external capacitor is
connected between SS and GND.
CSS: Capacitor value (μF)
The soft-start feature is activated when the TCV7101F exits the undervoltage lockout (UVLO) state after
power-up and when the voltage at the EN pin has changed from logic low to logic high.
Overcurrent Protection（OCP）
The TCV7101F has maximum current limiting. The TCV7101F limits the ON time of high side switching
transistor and decreases output voltage when the peak value of the LX terminal current exceeds switching
terminal peak current limitation ILIM=6.2A(typ.).
Undervoltage Lockout (UVLO)
The TCV7101F has undervoltage lockout (UVLO) protection circuitry. The TCV7101F does not provide output
voltage (VOUT) until the input voltage (VIN2) has reached VUVR (2.55 V typ.). UVLO has hysteresis of 0.1 V
(typ.). After the switch turns on, if VIN2 drops below VUV (2.45 V typ.), UVLO shuts off the switch at VOUT.
Figure 5 Undervoltage Lockout Operation
Soft start
VIN2
Hysteresis:
ΔVUV
Undervoltage lockout
detection voltage VUV
Switching operation
stops
GND
VOUT
GND
Undervoltage lockout
recovery voltage VUVR
Switching operation starts
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