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GT1510 の電気的特性と機能

GT1510のメーカーはGMOSです、この部品の機能は「PWM Control 3A Step-Down Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 GT1510
部品説明 PWM Control 3A Step-Down Converter
メーカ GMOS
ロゴ GMOS ロゴ 




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GT1510 Datasheet, GT1510 PDF,ピン配置, 機能
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/

1 Page





GT1510 pdf, ピン配列
PWM Control 3A Step-down Converter
GT1510
Preliminary
Absolute Maximum Ratings
Symbol
Parameter
VCC 输入电压 Supply Voltage
VEN使能输入电压 Enable Pin input voltage
VFB 反馈电压 Feedback Pin voltage
VOUT 输出电压 Output voltage to Ground
PD 耗散功率 Power dissipation
TST 储存温度 Storage temperature
TOP 运行温度 Operating temperature
VOP 运行电压 Operating voltage
Rating
+25
-0.3 to +VIN
-0.3 to +6
-1
Internally limited
-65 to +150
-20 to +125
+3.6 to +24
Unit
V
V
V
V
W
oC
oC
V
Electrical Characteristics
Unless otherwise specified, V IN=12V Ta=25 oC
Symbol
Parameter
Conditions
Min.
VFB Feedback Voltage 反馈电压
0.782
FOSC
FOSC1
oscillator frequency
after regulation 震荡频率
Measure waveform at SW pin
SW 脚测量波形
Oscillator frequency of short Measure waveform at SW pin
circuit when VFB <0.5V震荡频率(短路时)
SW 脚测量波形
300
VIN Input voltage 输入电压
3.6
VSH
VSL
ISH
ISL
ISW
IQ
ISTBY
VOUT/
VOUT
VOUT/
VOUT
IOCS
TSS
RDSON
EFFI
Ts
EN pin input voltage
使能脚输入电压
Evaluate oscillation at SW pin
Evaluate oscillation stop at SW
Pin SW脚震荡停止时评估
EN pin input leakage
Current EN脚泄漏电流
Switch Current 开关电流 Rocs = 2.5KΩ, VIN=12V
Quiescent Current 静态电流 VFB=12 force driver off
Standby Quiescent
Current 待机静态电流
VEN=0V
VIN =12V
Line regulation 线路调整率 VIN =3.6V to 30V , ILOAD=100mA
Load regulation 负载调整率 ILOAD=100mA to 2A
OCS pin bias current OCS脚偏流
Soft-Start time 软启动时间
Internal MOS RDSON
ISW=2A
Efficiency 效率
VIN=12V VOUT=5V
Over temperature 温控阀值 Tj increasing Measured
shutdown threshold
Tj decreasing from GND pin
2.0
-10
3.6
80
0.3
60
Typ.
0.8
Max.
0.818
380 440
40
24
0.8
10
4.5 5.5
5 10
10
0.6 1
0.2 0.5
100 120
24
70 90
92
150
100
Unit
V
Khz
Khz
V
V
uA
A
mA
uA
%
%
uA
ms
mΩ
%
oC
Application Circuit
GMOS Technology Corp.
www.gmos-semi.com
3/7
Free Datasheet http://www.datasheet4u.com/


3Pages


GT1510 電子部品, 半導体
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
Free Datasheet http://www.datasheet4u.com/

6 Page



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部品番号部品説明メーカ
GT1510

PWM Control 3A Step-Down Converter

GMOS
GMOS


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