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器件3D模型￥ 11.091
LM43603PWP 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
DC/DC转换器
封装:
HTSSOP-16
描述:
直流-直流开关同步降压稳压器, 可调, 3.5V-36V输入, 1V-28V/3A输出, HTSSOP-16
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P3Hot
典型应用电路图在P24P25P26
原理图在P1P14P15P20P22P24P25P29
封装尺寸在P45P47P48P49
焊盘布局在P42P50
标记信息在P45
封装信息在P44P45P46P47P48
技术参数、封装参数在P4
应用领域在P1P24P25P26
电气规格在P4P5P6
导航目录
LM43603PWP数据手册
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若手册格式错乱，请下载阅览PDF原文件
1000
10000
100000
1000000
0.001 0.010 0.100 1.000
Frequency (Hz)
Current (A)
8V
12V
24V
36V
C007
23
LM43603
www.ti.com
SNVSA09C –APRIL 2014–REVISED FEBRUARY 2017
Product Folder Links: LM43603
Submit Documentation FeedbackCopyright © 2014–2017, Texas Instruments Incorporated
Device Functional Modes (continued)
2. Discontinuous conduction mode (DCM) with fixed switching frequency when load current is lower than half of
the peak-to-peak inductor current ripple in CCM operation;
3. Pulse Frequency Modulation (PFM) when switching frequency is decreased at very light load;
4. Fold-back mode when switching frequency is decreased to maintain output regulation at lower supply voltage
V
IN
.
7.4.4 CCM Mode
Continuous Conduction Mode (CCM) operation is employed in the LM43603 when the load current is higher than
half of the peak-to-peak inductor current. In CCM peration, the frequency of operation is fixed by internal
oscillator unless the the minimum HS switch ON-time (T
ON_MIN
) or OFF-time (T
OFF_MIN
) is exceeded. Output
voltage ripple will be at a minimum in this mode and the maximum output current of 2 A can be supplied by the
LM43603.
7.4.5 Light Load Operation
When the load current is lower than half of the peak-to-peak inductor current in CCM, the LM43603 will operate
in Discontinuous Conduction Mode (DCM), also known as Diode Emulation Mode (DEM). In DCM operation, the
LS FET is turned off when the inductor current drops to 0 A to improve efficiency. Both switching losses and
conduction losses are reduced in DCM, comparing to forced PWM operation at light load.
At even lighter current loads, Pulse Frequency Mode (PFM) is activated to maintain high efficiency operation.
When the HS switch ON-time reduces to T
ON_MIN
or peak inductor current reduces to its minimum I
PEAK-MIN
, the
switching frequency will reduce to maintain proper regulation. Efficiency is greatly improved by reducing
switching and gate drive losses.
Figure 45. V
OUT
= 5 V Fs = 500 kHz
Pulse Frequency Mode Operation
7.4.6 Self-Bias Mode
For highest efficiency of operation, it is recommended that the BIAS pin be connected directly to V
OUT
when V
OUT
≥ 3.3 V. In this Self-Bias Mode of operation, the difference between the input and output voltages of the internal
LDO are reduced and therefore the total efficiency of the LM43603 is improved. These efficiency gains are more
evident during light load operation. During this mode of operation, the LM43603 operates with a minimum
quiescent current of 27 µA (typical). Please refer to VCC, UVLO and BIAS for more details.
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