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| 型号： | TPS40193DRCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 360 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 8/38页 |
| 文件大小： | 707K |
| 代理商： | TPS40193DRCR |
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I
G + fSW
Q
G (high) ) QG (low)
SLUS719C – MARCH 2007 – REVISED AUGUST 2010
www.ti.com
5-V Regulator
These devices have an on board 5-V regulator that allows the parts to operate from a single voltage feed. No
separate 5-V feed to the part is required. This regulator needs to have a minimum of 1-mF of capacitance on the
BP5 pin to guarantee stability. A ceramic capacitor is suggested for this purpose.
This regulator can also be used to supply power to nearby circuitry, eliminating the need for a separate LDO in
some cases. If this pin is used for external loads, be aware that this is the power supply for the internals of the
TPS40192/3. While efforts have been made to reduce sensitivity, any noise induced on this line has an adverse
effect on the overall performance of the internal circuitry and shows up as increased pulse jitter, or skewed
reference voltage. Also, when the device is disabled by pulling the EN pin low, this regulator is turned off and will
not be available to supply power.
The amount of power available from this pin varies with the size of the power MOSFETs that the drivers must
operate. Larger MOSFETs require more gate drive current and reduce the amount of power available on this pin
for other tasks. The total current that can be drwan from this pin by both the gate drive and external loads cannot
exceed 50mA. The device uses up to 4mA from the regulator and the total gate drive current can be found from
For regulator stability, a 1-mF capacitor is required to be connected from BP5 to GND. In some applications using
higher gate charge MOSFETs, a larger capacitor is required for noise suppression. For a total gate charge of
both the high and low side MOSFETs greater than 20 nC, a 2.2-mF or larger capacitor is recommended.
where
IG is the required gate drive current
f SW is the switching frequency (600 kHz for TPS40192, and 300 kHz for TPS40193)
QG(high) is the gate charge requirement for the high-side FET when VGS=5 V
QG(low) is the gate charge requirement for the low-side FET when VGS=5 V
(5)
16
Copyright 2007–2010, Texas Instruments Incorporated
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