參數(shù)資料
型號： TPS65120RGTT
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.2 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, 0.90 MM HEIGHT, GREEN, PLASTIC, QFN-16
文件頁數(shù)： 9/30頁
文件大?。?/td> 1047K
代理商： TPS65120RGTT
www.ti.com
APPLICATION INFORMATION
OUTPUT POWER CAPABILITY
GH
I
V
P
×
=
GL
I
V
P
×
=
5
.
0
V
for
I
0.5
V
P
MAIN
IN
MAIN
_
LDO
MAIN
BOOT
2
+
<
×
+
≈
η
×
=
MAIN
IN
MAIN
IN
MAIN
_
LDO
MAIN
BOOT
V
for
I
V
P
2
>
×
≈
η
×
=
SETTING THE OUTPUT VOLTAGE
FBM
MAIN
R6
R5
V
+
×
=
FBH
GH
R2
R1
V
+
×
=
MAIN
GL
R4
R3
V
×
=
TPS65120, TPS65121, TPS65123, TPS65124
SLVS531A – JUNE 2004 – REVISED MARCH 2005
The first step in the design procedure is to calculate the maximum output current for each output under certain
input and output voltage conditions. The TPS6512x uses time-multiplex operation to share the inductive storage
element between BOOT, VGH and VGL outputs. To avoid complex calculations it is recommended to use the
specified output-power data from the electrical characteristics table to determine the maximum output-power
capability.
The following example shows how to proceed for given requirements:
Input Voltage = 3.0 V
MAIN Output = 5.0 V @ 10 mA
VGH output = 12 V @ 500 A
VGL output = -12 V @ 300 A
1. Calculate Maximum Output Power on VGH Output
2. Calculate Maximum Output Power on VGL Output
3. Calculate Maximum Output Power on BOOT Output
4. Maximum Output Power Verification
The electrical characteristics table states that for VIN > 3.0 V, the maximum power on VGH and VGL outputs
must be lower than 35 mW each. Furthermore, the total output power (PBOOT + PGH + PGL) must be lower than
150 mW.
In our design example, PGH = 6 mW, PGL = 3.6 mW, and PBOOT = 55 mW. Since these numbers are well below
the specified values, we can conclude that TPS6512x can reasonably power such a display.
The output voltages are defined as shown in Figure 22.
with an internal reference voltage VFBM typical = 1.213V.
with an internal reference voltage VFBH typical = 1.213V.
To minimize the operating quiescent current, set R2, R4 and R6 in the range 100 k
to 300 k. Great care
should be taken to route the FBx lines away from noise sources such as the inductor or the SWN and SWP lines.
A feed-forward capacitor across the upper feedback resistor (R1, R3) on VGH and VGL outputs can be used to
provide more overdrive for the error comparator. This feed-forward capacitor helps to reduce the output ripple
voltage. A good starting value is 10 pF.
17
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS65120RGTTG4 功能描述:LCD 驅(qū)動器 Sgl-Inductor Qd-Otp Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
TPS65121RGTR 功能描述:LCD 驅(qū)動器 Sgl-Inductor Qd-Otp Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
TPS65121RGTRG4 功能描述:LCD 驅(qū)動器 Sgl-Inductor Qd-Otp Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
TPS65121RGTT 功能描述:LCD 驅(qū)動器 Sgl-Inductor Qd-Otp Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
TPS65121RGTTG4 功能描述:LCD 驅(qū)動器 Sgl-Inductor Qd-Otp Supply RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
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