參數(shù)資料
型號(hào)： LTC3737EUF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Dual 2-Phase, No RSENSE DC/DC Controller with Output Tracking
中文描述： 1 A DUAL SWITCHING CONTROLLER, 825 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, PLASTIC, QFN-24
文件頁(yè)數(shù)： 18/28頁(yè)
文件大?。?/td> 372K
代理商： LTC3737EUF
18
LTC3808
3808f
For coincident tracking (V
OUT
= V
X
during start-up),
R
TA
= R
A
, R
TB
= R
B
V
X
should always be greater than V
OUT
when using the
tracking function of TRACK/SS pin.
The internal current source (1
μ
A), which is for external
soft-start, will cause a tracking error at V
OUT
. For example,
if a 59k resistor is chosen for R
TA
, the R
TA
current will be
about 10
μ
A (600mV/59k). In this case, the 1
μ
A internal
current source will cause about 10% (1
μ
A/10
μ
A 100%)
tracking error, which is about 60mV (600mV 10%)
referred to V
FB
. This is acceptable for most applications. If
a better tracking accuracy is required, the value of R
TA
should be reduced.
Table 1 summarizes the different states in which the
TRACK/SS can be used.
Table 1. The States of the TRACK/SS Pin
TRACK/SS Pin
Capacitor C
SS
V
IN
Resistor Divider
FREQUENCY
External Soft-Start
Internal Soft-Start
V
OUT
Tracking an External Voltage V
X
Phase-Locked Loop and Frequency Synchronization
The LTC3808 has a phase-locked loop (PLL) comprised of
an internal voltage-controlled oscillator (VCO) and a phase
detector. This allows the turn-on of the external P-channel
MOSFET to be locked to the rising edge of an external clock
signal applied to the SYNC/MODE pin. The phase detector
is an edge sensitive digital type that provides zero degrees
phase shift between the external and internal oscillators.
This type of phase detector does not exhibit false lock to
harmonics of the external clock.
The output of the phase detector is a pair of complemen-
tary current sources that charge or discharge the external
filter network connected to the PLLLPF pin. The relation-
ship between the voltage on the PLLLPF pin and operating
frequency, when there is a clock signal applied to SYNC/
MODE, is shown in Figure 6 and specified in the electrical
characteristics table. Note that the LTC3808 can only be
synchronized to an external clock whose frequency is
within range of the LTC3808’s internal VCO, which is
APPLICATIU
W
U
U
TIME
(5b) Coincident Tracking
V
X
V
OUT
O
TIME
3808 F05b,c
(5c) Ratiometric Tracking
V
X
V
OUT
O
Figure 5b and 5c. Two Different Modes of Output Voltage Tracking
PLLLPF PIN VOLTAGE (V)
0.2
0
F
0.7
1.2
1.7
3808 F06
2.2
200
400
600
800
1000
1200
Figure 6. Relationship Between Oscillator Frequency
and Voltage at the PLLLPF Pin When Synchronizing to
an External Clock
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3738CUHF 功能描述:IC CTRLR SW REG 3PH STPDWN 38QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件
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