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
文件頁數(shù)： 33/52頁
文件大?。?/td> 1291K
代理商： TPS40180RGER
www.ti.com
s
OUT
RAMP
IN
OUT
RAMP
C
T
V
DCR AC
T
L
ln
V
2 V
V
DCR A
T
L
t =
-
÷
÷
÷
è
è
÷
÷
-
-
-
÷
÷
÷
÷
è
è
è
è
(40)
s
IN
OUT
RAMP
OUT
RAMP
C
T
V
DCR
AC
T
L
ln
V
DCR
A
T
L
t =
-
+
÷
÷
÷
è
è
÷
÷
-
÷
÷
÷
è
è
è
(41)
VCP1
OUT
1
f
2.36kHz
2
C
R
=
p
(42)
ESR
OUT
1
f
176.8kHz
2
C
ESR
=
p
(43)
+
C1
C2
R2
R1
V
REF
(
)
(
)
1
s R2 C2 1
Gc(s)
R1 (C1 C2)
C1 C2
s
s R2
1
C1 C2
+
=
+
÷
+
÷
÷
÷
+
è
è
(44)
SLVS753B – FEBRUARY 2007 – REVISED NOVEMBER 2007
Equation 40 is applied when the PWM pulse width is shorter than the current loop delay. The current loop delay
is typically 100ns.
Equation 41 is applied when the PWM pulse width is longer than the current loop delay. The current loop delay is
typically 100ns. Equation 42 is used in this design because the PWM pulse width is much larger than the current
loop delay. The low frequency pole is calculated by:
The ESR zero is calculated by:
In this design, a Type II compensator is employed to compensate the loop.
Figure 36. Type II Compensator
The compensator transfer function is:
The loop gain transfer function is:
Copyright 2007, Texas Instruments Incorporated
39
Product Folder Link(s): TPS40180
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