TS19375 데이터 시트보기 (PDF) - TSC Corporation
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TS19375 Datasheet PDF : 8 Pages
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TS19375
PWM Step-Up Controller
Function Description
PWM Control
The TS19375 is high efficient PWM step-up controller, the pulse width varies in a range from 0 to 85%. According
to the load current, the ripple voltage produced by the switching can easily be removed through a filter because the
switching frequency remains constant. Therefore, TS19375 provide a low-ripple power over broad ranges of input
voltage and load current.
Setting the Output Voltage
Application circuit shows the basic application circuit with adjustable output version. The external resistor sets the
output voltage according to the following formula:
Table 1: Resistor select for output voltage setting
VOUT
R2
R1
12V
1K
11K
15V
1.5K
21K
18V
1K
17K
24V
1.3K
30K
Current Limit Setting
The current limit threshold is setting by the external resistor (RSENSE) connecting from SENSE pin to GND (refer the
application circuit). The internal current limit compared voltage is 60mV. When the SENSE voltage is larger than
60mV, an over-current condition is triggered. Please refer to the formula for setting the minimum current limit value:
Note: ISW(MAX) is the maximum N-MOSFET current
Inductor Selection
For most designs, Low inductance values are physically smaller but require faster switching, which results in some
efficiency loss. The inductor value can be derived from the following formula:
Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor
ripple current approximately 15% of the maximum input current 3A, ∆IL=0.45A.
Table 2: Inductor select for output voltage setting (VCC=5V)
VOUT
9V
12V
15V
L1 Value
18uH
15uH
10uH
18V
10uH
The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple
current to prevent core saturation (3A+0.25A).
4/8
Version: B11
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