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参数资料
| 型号： | LTC3736-2EGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO24 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-24 |
| 文件页数： | 14/28页 |
| 文件大小： | 344K |
| 代理商： | LTC3736-2EGN#PBF |
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LTC3736-2
21
37362fb
APPLICATIONS INFORMATION
If VAUX drops below this value, the FCB voltage forces
temporary continuous switching operation until VAUX is
again above its minimum.
Table 3 summarizes the different states in which the
SYNC/FCB pin can be used.
Table 3
SYNC/FCB PIN
CONDITION
0V to 0.5V
Forced Continuous Mode
Current Reversal Allowed
0.7V to VIN
Pulse-Skipping Operation Enabled
No Current Reversal Allowed
Feedback Resistors
Regulate an Auxiliary Winding
External Clock Signal
Enable Phase-Locked Loop
(Synchronize to External CLK)
Pulse-Skipping at Light Loads
No Current Reversal Allowed
Fault Condition: Short-Circuit and Current Limit
To prevent excessive heating of the bottom MOSFET, fold-
back current limiting can be added to reduce the current
in proportion to the severity of the fault.
Foldback current limiting is implemented by adding
diodes DFB1 and DFB2 between the output and the ITH
pin as shown in Figure 11. In a hard short (VOUT = 0V),
the current will be reduced to approximately 50% of the
maximum output current.
Low Supply Operation
Although the LTC3736-2 can function down to below
2.4V, the maximum allowable output current is reduced
as VIN decreases below 3V. Figure 12 shows the amount
of change as the supply is reduced down to 2.4V. Also
shown is the effect on VREF.
Figures 10. Auxiliary Output Loop Connection
LTC3736-2
+
R6
R5
1μF
VOUT
VAUX
COUT
L1
1:N
SYNC/FCB
BG
SW
TG
37362 F10
VIN
Figures 11. Foldback Current Limiting
Figures 12. Line Regulation of VREF and
Maximum Sense Voltage for Low Input Supply
+
1/2 LTC3736-2
VFB
ITH
R2
DFB1
VOUT
DFB2
37362 F11
R1
INPUT VOLTAGE (V)
75
NORMALIZED
VOL
TAGE
OR
CURRENT
(%)
85
95
105
80
90
100
2.2
2.4
2.6
2.8
37362 F12
3.0
2.1
2.0
2.3
2.5
2.7
2.9
VREF
MAXIMUM
SENSE VOLTAGE
Minimum On-Time Considerations
Minimum on-time, tON(MIN), is the smallest amount of time
that the LTC3736-2 is capable of turning the top P-chan-
nel MOSFET on and then off. It is determined by internal
timing delays and the gate charge required to turn on the
top MOSFET. Low duty cycle and high frequency applica-
tions may approach the minimum on-time limit and care
should be taken to ensure that:
t
V
fV
ON MIN
OUT
OSC
IN
()
<
If the duty cycle falls below what can be accommodated
by the minimum on-time, the LTC3736-2 will begin to
skip cycles (unless forced continuous mode is selected).
The output voltage will continue to be regulated, but the
ripple current and ripple voltage will increase. The mini-
mum on-time for the LTC3736-2 is typically about 200ns.
However, as the peak sense voltage (IL(PEAK) RDS(ON))
decreases, the minimum on-time gradually increases up
to about 250ns. This is of particular concern in forced
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相关代理商/技术参数 |
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| 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) |
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