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参数资料
| 型号： | LTC3736-2EUF#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件页数： | 11/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EUF#TRPBF |
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LTC3736-2
19
37362fb
APPLICATIONS INFORMATION
For coincident tracking,
tt
V
SS
OUT F
21
2
1
=
where VOUT1F and VOUT2F are the nal, regulated values
of VOUT1 and VOUT2. VOUT1 should always be greater than
VOUT2 when using the TRACK pin. If no tracking function is
desired, then the TRACK pin may be tied to VIN. However,
in this situation there would be no (internal nor external)
soft-start on VOUT2.
Phase-Locked Loop and Frequency Synchronization
The LTC3736-2 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 of controller 1 to be locked to the rising edge
of an external clock signal applied to the SYNC/FCB pin.
The turn-on of controller 2’s external P-channel MOSFET
is thus 180 degrees out-of-phase with the external clock.
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 complementary
current sources that charge or discharge the external lter
network connected to the PLLLPF pin. The relationship
between the voltage on the PLLLPF pin and operating
frequency, when there is a clock signal applied to SYNC/
FCB, is shown in Figure 8 and specied in the Electrical
Characteristics table. Note that the LTC3736-2 can only be
synchronized to an external clock whose frequency is within
range of the LTC3736-2’s internal VCO, which is nominally
200kHz to 1MHz. This is guaranteed, over temperature and
variations, to be between 300kHz and 750kHz. A simplied
block diagram is shown in Figure 9.
If the external clock frequency is greater than the internal
oscillator’s frequency, fOSC, then current is sourced con-
tinuously from the phase detector output, pulling up the
PLLLPF pin. When the external clock frequency is less
Figures 7b and 7c. Two Different Modes of Output Voltage Tracking
TIME
(7b) Coincident Tracking
VOUT1
VOUT2
OUTPUT
VOL
TAGE
TIME
37362 F07b,c
(7c) Ratiometric Tracking
VOUT1
VOUT2
OUTPUT
VOL
TAGE
Figure 8. Relationship Between Oscillator Frequency and Voltage
at the PLLLPF Pin When Synchronizing to an External Clock
PLLLPF PIN VOLTAGE (V)
0
FREQUENCY
(kHz)
0.5
1
1.5
2
37362 F08
2.4
200
400
600
800
1000
1200
1400
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3736EGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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) |
| LTC3736EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3736EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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) |
| LTC3736EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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) |
| LTC3736EGN-1 | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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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