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參數(shù)資料
| 型號(hào)： | TPS51211DSCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 314 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, SON-10 |
| 文件頁數(shù)： | 5/26頁 |
| 文件大小： | 674K |
| 代理商： | TPS51211DSCT |
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R1
R2
Voltage Divider
+
V
FB
+
0.7 V
PWM
Control
Logic
and
Driver
V
IN
L
ESR
C
O
V
C
R
L
I
IND
I
OUT
UDG-09063
I
C
Switching Modulator
Output
Capacitor
DRVH
DRVL
V
OUT
O
1
H(s)
s
ESR
C
=
fSW
0
O
1
f
2
ESR
C
4
=
p
TPS51211
www.ti.com
SLUSAA7 – NOVEMBER 2010
SMALL SIGNAL MODEL
From small-signal loop analysis, a buck converter using D-CAP mode can be simplified as shown in Figure 14.
Figure 14. Simplified Modulator Model
The output voltage is compared with internal reference voltage (ramp signal is ignored here for simplicity). The
PWM comparator determines the timing to turn on the high-side MOSFET. The gain and speed of the
comparator can be assumed high enough to keep the voltage at the beginning of each on cycle substantially
constant.
(1)
For loop stability, the 0-dB frequency, 0, defined in Equation 2 need to be lower than 1/4 of the switching
frequency.
(2)
According to Equation 2, the loop stability of D-CAP mode modulator is mainly determined by the capacitor's
chemistry. For example, specialty polymer capacitors (SP-CAP) have CO on the order of several 100 mF and
ESR in range of 10 m
. These makes f0 on the order of 100 kHz or less and the loop is stable. However,
ceramic capacitors have an 0 of more than 700 kHz, which is not suitable for this modulator.
RAMP SIGNAL
The TPS51211 adds a ramp signal to the 0.7-V reference in order to improve its jitter performance. As described
in the previous section, the feedback voltage is compared with the reference information to keep the output
voltage in regulation. By adding a small ramp signal to the reference, the S/N ratio at the onset of a new
switching cycle is improved. Therefore the operation becomes less jittery and more stable. The ramp signal is
controlled to start with –7 mV at the beginning of ON-cycle and becomes 0 mV at the end of OFF-cycle in
continuous conduction steady state.
Copyright 2010, Texas Instruments Incorporated
13
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