参数资料
型号: TPS63061DSCR
厂商: Texas Instruments
文件页数: 17/32页
文件大小: 0K
描述: IC REG BUCK BST SYNC 5V 1A 10SON
标准包装: 1
类型: 降压(降压),升压(升压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 2.5 V ~ 12 V
PWM 型: 电流模式
频率 - 开关: 2.4MHz
电流 - 输出: 1A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-WFQFN 裸露焊盘
包装: 标准包装
供应商设备封装: 10-SON 裸露焊盘(3x3)
其它名称: 296-30205-6
SLVSA92A – DECEMBER 2011 – REVISED FEBRUARY 2012
Heavy Load transient step
PFM mode at light load
3.5%
3%
2.5%
Vo
current
Comparator High
Comparator low
PWM mode
Absolute Voltage drop
with positioning
Figure 29. Power-Save Mode Thresholds and Dynamic Voltage Positioning
Dynamic voltage positioning
As detailed in Figure 29 , the output voltage is typically 3% above the nominal output voltage at light load
currents, as the device is in Power Save Mode. This gives additional headroom for the voltage drop during a load
transient from light load to full load. This allows the converter to operate with a small output capacitor and still
have a low absolute voltage drop during heavy load transient changes. See Figure 29 for detailed operation of
the Power Save Mode
Dynamic Current limit
In order to keep the output voltage regulated when the power source becomes weaker the device has
implemented a dynamic current limit function. The maximum current allowed through the switch depends on the
voltage applied at the input terminal of the TPS6306X. The curve in Figure 30 shows this dependency, and the
I SW versus V IN . The dynamic current limit has its lowest value when reaching the minimum recommended supply
voltage at V IN .
Given the I SW value from Figure 30 , is then possible to calculate the output current reached in boost mode using
Equation 1 and Equation 2 and in buck mode using Equation 3 and Equation 4 .
IN
OUT
OUT
Duty Cycle Boost
D=
V -V
V
(1)
I = h x I x (1 - D)
Maximum Output Current Boost
OUT SW
(2)
OUT
IN
Duty Cycle Buck
D=
V
V
(3)
OUT SW
Maximum Output Current Buck
I =I
(4)
With,
η = Estimated converter efficiency (use the number from the efficiency curves or 0.80 as an assumption)
f = Converter switching frequency (typical 2.4 MHz)
L = Selected inductor value
Copyright ? 2011 – 2012, Texas Instruments Incorporated
Product Folder Link(s): TPS63060 TPS63061
17
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