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参数资料
| 型号： | LTC3860EUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-QFN |
| 标准包装： | 73 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1.25MHz |
| 占空比： | 91.5% |
| 电源电压： | 3 V ~ 5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
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LTC3860
APPLICATIONS INFORMATION
the TRACK/SS2 pin voltage instead of 0.6V. The start-up
of V OUT2 may ratiometrically track that of V OUT1 , according
to a ratio set by a resistor divider (Figure 11c):
Feedback Loop Compensation
The LTC3860 is a voltage mode controller with a second
dedicated current sharing loop to provide excellent phase-
R + R TRACKB
V OUT1
V OUT2
=
R2A
R TRACKA
? TRACKA
R2B + R2A
to-phase current sharing in multiphase applications. The
current sharing loop is internally compensated.
For coincident tracking (V OUT1 = V OUT2 during start-up),
R2A = R TRACKA
R2B = R TRACKB
The ramp time for V OUT2 to rise from 0V to its ?nal
value is:
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
ampli?ers sense the output voltage at V OUT .
R + R TRACKB
t SS2 =t SS1 ?
0.6
V OUT1F
? TRACKA
R TRACKA
The positive input of the error ampli?er is connected to
an internal 600mV reference, while the negative input is
connected to the FB pin. The output is connected to COMP,
For coincident tracking,
which is in turn connected to the line feedforward circuit
t SS2 = t SS1 ?
V OUT2F
V OUT1F
and from there to the PWM generator. To speed up the
overshoot recovery time, the maximum potential at the
COMP pin is internally clamped.
where V OUT1F and V OUT2F are the ?nal, regulated values
of V OUT1 and V OUT2 . V OUT1 should always be greater than
V OUT2 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.
Unlike many regulators that use a transconductance (g m )
ampli?er, the LTC3860 is designed to use an inverting
summing ampli?er topology with the FB pin con?gured
as a virtual ground. This allows the feedback gain to be
tightly controlled by external components, which is not
possible with a simple g m ampli?er. In addition, the voltage
feedback ampli?er 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 signi?cantly improves the control loop
phase margin.
C2
V OUT
C3
R2
C1
–1
R1
R3
GAIN
+1
–1
0
FREQ
R B
V REF
FB
COMP
PHASE
BOOST
–90
–180
–270
–380
3806 F12
Figure 12. Type 3 Ampli?er Compensation
3860fc
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3860IUH#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3860IUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3861EUH-1#PBF | 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN 制造商:Linear Technology 功能描述:BUCK CNTRL DUAL 12PH 2.25MHZ 32QFN 制造商:Linear Technology 功能描述:BUCK, CNTRL, DUAL, 12PH, 2.25MHZ, 32QFN 制造商:Linear Technology 功能描述:PWM CONTROLLER, BUCK, 2.25MHZ, 24V, QFN-32, Input Voltage:24V, Output Voltage:5.5V, Output Current:60A, Supply Voltage Min:3V, Supply Voltage Max:5.5V, Digital IC Case Style:QFN, No. of Pins:32, Frequency:2.25MHz , RoHS Compliant: Yes 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Dual-Phase/Dual-Channel Step-Down Voltage Mode Controller w |
| LTC3861EUH-1#TRPBF | 制造商:Linear Technology 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN |
| LTC3861EUHE#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 36-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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