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PDF TS2509 Data sheet ( Hoja de datos )
| Número de pieza | TS2509 | |
| Descripción | 3A / 500KHz PWM Buck Converter | |
| Fabricantes | Taiwan Semiconductor Company | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TS2509 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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TS2509
3A / 500KHz PWM Bwwuwc.DkataCShoeent4vU.ecormter
SOP-8
Pin Definition:
1. FB
8. Vss
2. EN
7. Vss
3. Comp 6. SW
4. Vcc
5. SW
General Description
TS2509 consists of step-down switching regulator with PWM control. These devise include a reference voltage
source, oscillation circuit, error amplifier, internal PMOS and etc. TS2509 provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM control circuit is able to the duty ratio linearly form 0 up to 100%.
This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup.
An enable function, an over current protect function and short circuit protect function are built inside, and when OCP
or SCP happens, the operation frequency will be reduced. Also, an internal compensation block is built in to minimum
external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode
connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply
units for portable devices when coupled with the SOP-8L package, providing such outstanding features as low current
consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation
via an AC adapter.
Features
● Input Voltage: 3.6V~23V
● Output Voltage: 0.8V~Vcc
● Duty Ratio: 0%~100% PWM Control
● Oscillation Frequency: 500kHz typ.
● Soft-Start (SS), Current Limit (CL), Enable Function
● Thermal Shutdown Function
● Short Circuit Protect (SCP)
● External SW P-Channel MOSFET
● Low ESR output capacitor (MLCC application)
Ordering Information
Part No.
TS2509CS RL
Package
SOP-8
Packing
2.5Kpcs / 13” Reel
Application
● Simple High-efficiency Step down Regulator
● On-Card Switching Regulators
Absolute Maximum Rating
Parameter
Symbol
Rating
Unit
VCC Pin Voltage
Feedback Pin Voltage
VCC VSS - 0.3 to VSS + 25 V
VFB VSS - 0.3 to VCC
V
ON/OFF Pin Voltage
Switch Pin Voltage
Power Dissipation
Storage Temperature Range
Operating Temperature Range
Operating Supply Voltage
VEN
VSW
PD
TST G
TOP
VOP
VSS - 0.3 to VCC + 0.3
VSS - 0.3 to VCC + 0.3
Internally limited
-40 to +150
-20 to +125
+3.6 to +23
V
V
mW
℃
℃
V
Thermal Resistance from Junction to case
θJC
40 ℃/W
Thermal Resistance from Junction to ambient
θJA
70 ℃/W
1/9 Version: A09
1 page  
TS2509
3A / 500KHz PWM Bwwuwc.DkataCShoeent4vU.ecormter
Function Descriptions (Continue)
Output Capacitor Selection
(EL CAP)
The output capacitor is required to filter the output and provide regulator loop stability. The important capacitor
parameters are; the 100KHz Equivalent Series Resistance (ESR), the RMS ripples current rating, voltage rating, and
capacitance value. For the output capacitor, the ESR value is the most important parameter. The ESR can be
calculated from the following formula.
VRIPPLE = ∆IL x ESR = 0.4A x 110mΩ = 44mV
An aluminum electrolytic capacitor's ESR value is related to the capacitance and its voltage rating. In most case, higher
voltage electrolytic capacitors have lower ESR values. Most of the time, capacitors with much higher voltage ratings
may be needed to provide the low ESR values required for low output ripple voltage. It is recommended to replace this
low ESR capacitor by using a 330µF low ESR values < 110mΩ
(MLCC)
A 33µF MLCC or three 10uF MLCC capacitors for most applications is sufficient.
RDS(ON) Current Limiting
The current limit threshold is setting by the internal circuit.
VIN
ICL(MIN)
IOUT(MAX)
4.6V~6V
3A
2.5A
6V~10V
3.8A
3A
10V~23V
4.0A
3A
Layout Guidance
When laying out the PC board, the following suggestions should be taken to ensure proper operation of the TS2509.
These items are also illustrated graphically in below.
1. The power traces, including the PMOS Drain & Source trace, the Schottky and the C2 trace should be kept short,
direct and wide to allow large current flow.
2. Connect the C5 to the VCC & EN pins of the TS2509 as closely as possible to get good power filter effect.
3. Keep the switching node, away from the sensitive FB node.
4. Connect ground side of the C2 & D1 as closely as possible.
5. Connect PMOS Source and R3 as closely as possible.
6. Do not trace signal line under inductor.
5/9 Version: A09
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet TS2509.PDF ] | |
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