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参数资料
| 型号： | LTC3829EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 26/40页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38TSSOP |
| 标准包装： | 50 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 850kHz |
| 占空比： | 94% |
| 电源电压： | 4.5 V ~ 38 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： | 38-TFSOP （0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 管件 |
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LTC3829
APPLICATIONS INFORMATION
V FB = V REF –
0.5 – V IFAST
V FB = V REF +
t SOFTSTART = 0.6 ?
NonlinearcontrolisonlyenabledwhenV FB iswithinthe
UV and OV window. It should be enabled only for forced
continuous mode of operation.
Once nonlinear control is enabled, the top gate of all chan-
nels will turn on if:
? 1.2
5
The top gate of all channels will turn off if:
0.5 – V IFAST
5
where V REF is the reference voltage, normally at 0.6V, and
V FB is the feedback voltage.
Soft-Start and Tracking
The LTC3829 has the ability to either soft-start by itself
with a capacitor or track the output of another channel or
external supply. When the controller is configured to soft-
start by itself, a capacitor should be connected to its TK/SS
pin. The controller is in the shutdown state if its RUN pin
voltage is below 1.22V and its TK/SS pin is actively pulled
to ground in this shutdown state. If the RUN pin voltage
is above 1.22V, the controller powers up. A soft-start cur-
rent of 1.25μA then starts to charge the TK/SS soft-start
capacitor. Note that soft-start or tracking is achieved not
by limiting the maximum output current of the control-
ler but by controlling the output ramp voltage according
to the ramp rate on the TK/SS pin. Current foldback is
disabled during this phase to ensure smooth soft-start or
tracking. The soft-start or tracking range is defined to be
the voltage range from 0V to 0.6V on the TK/SS pin. The
total soft-start time can be calculated as:
C SS
1.25μA
Regardless of the mode selected by the MODE pin, the
controller always starts in discontinuous mode up to TK/SS
= 0.5V. Between TK/SS = 0.5V and 0.54V, it will operate in
forced continuous mode and revert to the selected mode
once TK/SS > 0.54V. The output ripple is minimized dur-
ing the 40mV forced continuous mode window ensuring
a clean PGOOD signal. When the channel is configured
to track another supply, the feedback voltage of the other
supply is duplicated by a resistor divider and applied to
the TK/SS pin. Therefore, the voltage ramp rate on this
pin is determined by the ramp rate of the other supply’s
voltage. Note that the small soft-start capacitor charging
current is always flowing, producing a small offset error.
To minimize this error, select the tracking resistive divider
value to be small enough to make this error negligible.
In order to track down another channel or supply after
the soft-start phase expires, the LTC3829 is forced into
continuous mode of operation as soon as V FB is below the
undervoltage threshold of 0.54V regardless of the setting
on the MODE pin. However, the LTC3829 should always be
set in forced continuous mode tracking down when there
is no load. After TK/SS drops below 0.1V, the controller
operates in discontinuous mode.
3829fa
26
For more information www.linear.com/LTC3829
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相关代理商/技术参数 |
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| LTC3829EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-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) |
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