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參數(shù)資料
| 型號(hào)： | LTC3860IUH#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32 |
| 文件頁數(shù)： | 15/36頁 |
| 文件大小： | 436K |
| 代理商： | LTC3860IUH#PBF |
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LTC3860
22
3860fc
the TRACK/SS2 pin voltage instead of 0.6V. The start-up
of VOUT2 may ratiometrically track that of VOUT1, according
to a ratio set by a resistor divider (Figure 11c):
V
OUT1
V
OUT2
=
R2A
R
TRACKA
R
TRACKA + RTRACKB
R2B
+R2A
For coincident tracking (VOUT1 = VOUT2 during start-up),
R2A = RTRACKA
R2B = RTRACKB
The ramp time for VOUT2 to rise from 0V to its nal
value is:
t
SS2 = tSS1
0.6
V
OUT1F
R
TRACKA + RTRACKB
R
TRACKA
For coincident tracking,
t
SS2 = tSS1
V
OUT2F
V
OUT1F
where VOUT1F and VOUT2F are the nal, regulated values
of VOUT1 and VOUT2. VOUT1 should always be greater than
VOUT2 when using the TRACK/SS2 pin for tracking. If no
tracking function is desired, then the TRACK/SS2 pin may
be tied to a capacitor to ground, which sets the ramp time
to nal regulated output voltage. It is only possible to track
another supply that is slower than the internal soft-start
ramp. At the completion of tracking, the TRACK/SS pin
must be >620mV, so as not to affect regulation accuracy
and to ensure the part is in CCM mode.
APPLICATIONS INFORMATION
Feedback Loop Compensation
The LTC3860 is a voltage mode controller with a second
dedicated current sharing loop to provide excellent phase-
to-phase current sharing in multiphase applications. The
current sharing loop is internally compensated.
While Type 2 compensation for the voltage control loop
may be adequate in some applications (such as with the
use of high ESR bulk capacitors), Type 3 compensation,
along with ceramic capacitors, is recommended for opti-
mum transient response. Referring to Figure 12, the error
ampliers sense the output voltage at VOUT.
The positive input of the error amplier is connected to
an internal 600mV reference, while the negative input is
connected to the FB pin. The output is connected to COMP,
which is in turn connected to the line feedforward circuit
and from there to the PWM generator. To speed up the
overshoot recovery time, the maximum potential at the
COMP pin is internally clamped.
Unlike many regulators that use a transconductance (gm)
amplier, the LTC3860 is designed to use an inverting
summing amplier topology with the FB pin congured
as a virtual ground. This allows the feedback gain to be
tightly controlled by external components, which is not
possible with a simple gm amplier. In addition, the voltage
feedback amplier allows exibility in choosing pole and
zero locations. In particular, it allows the use of Type 3
compensation, which provides a phase boost at the LC
pole frequency and signicantly improves the control loop
phase margin.
–
+
VOUT
VREF
R1
R3
C3
R2
C1
GAIN
(dB)
C2
FB
RB
COMP
FREQ
–1
+1
GAIN
PHASE
BOOST
0
PHASE
(DEG)
–90
–180
–270
–380
3806 F12
Figure 12. Type 3 Amplier Compensation
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