参数资料
型号: TPS24713DGSR
厂商: TEXAS INSTRUMENTS INC
元件分类: 电源管理
英文描述: POWER SUPPLY SUPPORT CKT, PDSO10
封装: GREEN, PLASTIC, MSOP-10
文件页数: 19/34页
文件大小: 2148K
代理商: TPS24713DGSR
GATE
ISS
VCC
t
C
I
C
V
D
=
-
÷
è
Partof
TPS2471x
M
1
ToLoad
GND
GATE
FromSource
R
GATE
1k
C
GATE
S0509-02
I
30 A
GATE
SLVSAL2C
– JANUARY 2011 – REVISED MAY 2011
(14)
Figure 36. Gate Capacitor (dV/dt) Control Inrush Mode.
ADDITIONAL DESIGN CONSIDERATIONS
Use of PG/PGb
Use the PG/PGb pin to control and coordinate a downstream dc/dc converter. If this is not done, then a long time
delay is needed to allow COUT to fully charge before the converter starts. An undesirable latch-up condition can
be created between the TPS24710/11/12/13 output characteristic and the dc/dc converter input characteristic if
the converter starts while COUT is still charging; the PG/PGb pin is one way to avoid this
Output Clamp Diode
Inductive loads on the output may drive the OUT pin below GND when the circuit is unplugged or during a
current-limit event. The OUT pin ratings can be satisfied by connecting a diode from OUT to GND. The diode
should be selected to control the negative voltage at the full short-circuit current. Schottky diodes are generally
recommended for this application.
Gate Clamp Diode
The TPS24710/11/12/13 has a relatively well-regulated gate voltage of 12 V to 15.5 V with a supply voltage VVCC
higher than 4 V. A small clamp Zener from gate to source of M1 is recommended if VGS of M1 is rated below 12
V. A series resistance of several hundred ohms or a series silicon diode is recommended to prevent the output
capacitance from discharging through the gate driver to ground.
High-Gate-Capacitance Applications
Gate voltage overstress and abnormally large fault current spikes can be caused by large gate capacitance. An
external gate clamp Zener diode is recommended to assist the internal Zener if the total gate capacitance of M1
exceeds about 4000 pF. When gate capacitor dV/dt control is used, a 1-k
Ω resistor in series with CGATE is
recommended (see Figure 36). If the series R-C combination is used for MOSFETs with CISS less than 3000 pF,
then a Zener diode is not necessary.
26
Copyright
2011, Texas Instruments Incorporated
Product Folder Link(s): TPS24710 TPS24711 TPS24712 TPS24713
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