參數(shù)資料
型號(hào)： TPS40180RGER
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC24
封裝： GREEN, PLASTIC, VQFN-24
文件頁(yè)數(shù)： 10/52頁(yè)
文件大小： 1291K
代理商： TPS40180RGER
www.ti.com
(
)
REF
SS
V
R3
R1
R2
R5
V
I
R2
=
÷
÷
÷
-
è
è
(6)
R1 C1
R 2
C 2
=
(7)
Current Sensing and Overcurrent Detection
5
+
VSH
ILIM
6
COMP
24
R2
TPS40180
23
22
CS+
CS-
+
VC
S
+
S
+
-
+
V
OUT
R1
1.8 V
23.5 mA
+
0.5 V
0 V
Ramp
PWM
Overcurrent
E/A
UDG-07028
+
-
I
OUT
CS gain = 12.5
Ve
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
When choosing component values, the SS pin current (ISS) must be accounted for in order to prevent an offset in
the output of the TPS40180 converter and the tracked supply.
where
R1, R2, R3 and R5 are in
V
REF is the reference voltage of the TPS40180 (700 mV)
I
(SS) is the SS pin current (15A typical)
To use Equation 6, R3 and R5 must be known from the design of the compensation network and nominal
converter output voltage. R2 is then chosen arbitrarily. A value between 1 k
and 10 k is suggested. Too large
a value and the tracking error is greater. Too small, and the requirements for C2 and C2 become excessive.
Once R1 and R2 have been chosen, C1 and C2 can be chosen. The R1-C1 time constant and the R2 C2 time
constant should match.
Absolute matching of the time constants is not necessary for Equation 7. The nearest standard values of
capacitor provides satisfactory results. Pick a value for C1 or C2 and find the closest corresponding standard
value for the other capacitor.
The TPS40180 uses the current sensing architecture shown in Figure 25.
Figure 25. Current Sense Architecture
The sense resistor can either be a resistor between the inductor and the output capacitor(s) or an R-C filter
across the inductor.
18
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS40180
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