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GT1510 Schematic ( PDF Datasheet ) - GMOS

Teilenummer GT1510
Beschreibung PWM Control 3A Step-Down Converter
Hersteller GMOS
Logo GMOS Logo 




Gesamt 7 Seiten
GT1510 Datasheet, Funktion
GT1510
PWM Control 3A Step-Down Converter
General Description
The GT1510 consists of step-down switching
regulator with PWM control . This device include a
reference source, oscillation circuit,error amplifier,
internal P-channel DMOS and etc.
GT1510 provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM
control circuit is able to vary the duty ratio linearly
from 0 up to 100%. This converter also contains an
error amplifier as well as a soft-start circuit that
prevent a overshoot at startup. An enable function,
over current protect function and a short circuit
protect function are built inside, when OCP or SCP
happens, the operation frequency will be reduced
from 300KHz to 40KHz. Also, an internal
compensation block is built in to minimum external
component count.
With the addition of internal P-channel DMOS, a
coil, capacitors, and a schottky diode connected
externally, this IC serve as ideal power supply unit
for portable when coupled with the SOP-8L
mini-package, providing such outstanding features
as low current consumption. Since this converter
can accommodate an input voltage up to 24V, It is
also ideal when operating via an AC adapter.
Pin Assignments 脚位排列
Features
- Input voltage:3.6V to 24V
- Adjustable output voltage range :0.8V to VCC
- Duty ratio:0% to 100% PWM control
- Oscillation frequency:380KHz typ.
- Soft-start, Current limit,Enable function
- Thermal Shutdown function
- Bulit-in internal 60mΩ P-channel DMOS
- Up to 95% Efficiency
- Output load current: 3A
- SOP-8L Pb-Free Package
- Low power standby mode
Applications
- Distributed Power Systems
- LCD Monitor
- DVD-Video Player
- Telecom Equipment
- ADSL Modem
- Printer and other Peripheral Equipment
- Battery Chargers
- Set-Top Boxes
- Cigarette Lighter Powered Devices
Pin Descriptions 脚功能描述
(Top View)
FB 1
EN 2
OCS 3
VIN 4
8 GND
7 GND
6 SW
5 SW
SOP-8L
Pin# Name
Description
1 FB Feedback pin 反馈脚
Power-off pin 使能脚
2 EN H: Normal operation
使能 L: Disable operation
Connects an external resistor to
3 OCS set maximum output current.电流设置脚
(外接一个电阻设置最大输出电流)
4 VIN IC power supply pin. 输入脚
Switch Pin. Connect external
5,6 SW inductor/schottky diode here.开关脚
(接一电感或者肖特基二极管)
7,8 GND Ground Pin.接地脚
GMOS Technology Crop.
www.gmos-semi.com
1/7
Free Datasheet http://www.datasheet4u.com/






GT1510 Datasheet, Funktion
PWM Control 3A Step-down Converter
GT1510
Preliminary
the off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VIN rises
above 3.5V.
RDS(ON) Current Limiting
The current limit threshold is setting by the external resistor connecting from VIN supply to OCS pin. The
internal 100uA sink current crossing the external resistor sets the voltage at the OCS pin. The power loss of
the external resistor is less than the power loss of MOSFET, an over-current condition is triggered.
ILOAD x RDS(ON) = IOCS x ROCS
See above formula for setting the current limit value.
Thermal management and PCB layout Consideration
The thermal performance of the GT1510 is strongly affected by the PCB layout. The size of the heatsink
depends on the input voltage, the output voltage, the load current and the ambient temperature.
In the GT1510 buck regulator circuit, the major power dissipating component are the GT1510,The Schottky
diode and output inductor. The total power dissipation of converter circuit can be measured by input power
minus output power.
P total_loss = VIN * IIN V O * IO
The power dissipation in Schottky diode can be approximated as: (D: PWM Duty cycle)
P diode_loss = IO * ( 1 D) * V FW_Schottky
The power dissipation of inductor can be approximated as:
P inductor_loss = IO _* Rinductor
The actual junction temperature can be calculated with power dissipation in the GT1510 and thermal
impedence from junction to ambient. (Θ JA = 65 oC / W )
Tjunction = ( P total_loss P diode_loss P inductor_loss ) *Θ JA
The maximum junction temperature of GT1510 is 150oC, which limits the maximum load current capability.
The two LX pin are connected to internal MOSFET drain. They are low resistance thermal conductor path
and most noisy switching node. Connected a copper plane to LX pin to help thermal dissipation. The copper
plane should not be too larger otherwise switching noise may be coupled to other part of circuit in PCB.
Marking Information
( Top view )
Output Type:
1510 :ADJ
1510-33: 3.3V
1510-50: 5.0V
1510-12: 12V
GT
1510-XX
YY WW ~
Logo
ID code
Xth week: 01~52
Year: "06" = 2006
"07" = 2007
GMOS Technology Corp.
www.gmos-semi.com
6/7
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