TS2508 Taiwan Semiconductor Company, Ltd. (TSC), TS2508 Datasheet - Page 3

• Manufacturer Part Number: TS2508
• Description: 2a / 330khz Pwm Buck Converter
• Manufacturer: Taiwan Semiconductor Company, Ltd. (TSC)

Application Circuit
Typical Circuit
Function Descriptions
PWM Control
The TS2508 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the
TS2508, the pulse width varies in a range from 0 to 100%, 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,
these converters provide a low-ripple power over broad ranges of input voltage and load current.
RDS(ON) Current Limiting
The current limit threshold is setting by the external resistor (R3) connecting from V
internal 110uA sink current crossing the resistor sets the voltage at pin of OCSET. When the PWM voltage is less than
the voltage at OCSET, an over-current condition is triggered. Please refer to the formula for setting the minimum
current limit value:
Example: I
L1 Value
V
OUT
I
SW
SW
L1 recommend value (V
=(0.11mA * 2k + 0.08) / 70mΩ = 3.2A – (V
=(0.11mA * 3.3k + 0.08) / 1000mΩ = 3.5A – (V
18uH
1.8V
22uH
2.5V
IN
=12V, I
27uH
3.3V
OUT
=2A )
(Normally, The I
33uH
IN
5V
=12V)
3/8
IN
=5V)
2A / 330KHz PWM Buck Converter
SW(MAX)
setting more than I
CC
supply to OCSET pin. The
OUT
1.2A)
TS2508
Version: B07