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PDF GT1510 Data sheet ( Hoja de datos )

Número de pieza GT1510
Descripción PWM Control 3A Step-Down Converter
Fabricantes GMOS 
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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/

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GT1510 pdf
PWM Control 3A Step-down Converter
GT1510
Preliminary
The GT1510 uses a P-Channel MOSFET as the high switch. It saves the bootstrap capacitor normally seen
in a circuit which is using an NMOS switch.
Switching Frequency
The GT1510 switching frequency is fixed after regulation, The typical value of frequency is 380KHz. When
FB drop below 0.5V,The short circuit protection is triggered and the frequency equals to 1/9 of normal
switching frequency. The inductor average current is greatly reduced because of the lower frequency.
Output Voltage Programming
Output voltage can be set by feeding back the output to the FB pin with a resistor divider network. In the
application circuit, The resistor divider network include R 1 and R2. Usually, a design is started by picking a
fixed R2 value and calculating the required R1 with equation below.
VO= 0.8 x ( R1 + R2 ) / R2
Some standard value of R1 and R2 for most commonly used output voltage are listed below.
Vo ( V )
R1 (K)
R2 (K)
L1 Minimum
0.8V
0
open
3.3uH
1.0V
2.50
10 3.3uH
1.2V
4.99
10 4.7uH
1.5V 10 11.5 6.8uH
1.8V 12.7 10.2 6.8uH
2.5V
21.5
10 8.2uH
3.3V
31.6
10 10uH
5.0V
52.3
10 15uH
Since the switch duty cycle can be as high as 100%, the maximum output voltage can be set as high as the
input voltage minus the voltage drop on upper PMOS and inductor.
Protection Features
The GT1510 has multiple protection features to prevent system circuit damage under abnormal conditions.
Over Current Protection (OCP)
Over current protection is implemented by sensing the voltage drop across the drain to source of the high
side power MOSFET. The RDSON of power MOSFET is between 60mand 80 mdepending on input
voltage and junction temperature. The drain to source voltage is then compared to a voltage level
representing the over current threshold limit. The current limit threshold is set by external resistor connected
between OCS pin and VIN. The stable current flow from VIN through resistor into OCS pin is about 100uA.
When the load current reach the current limit threshold, the cycle by cycle current limit circuit turn off the high
side switch immediately to terminate the current duty cycle. The inductor current stop rising. When cycle by
cycle current limit circuit is triggered, the output voltage drops as the duty cycle decreasing and the
frequency reduces to 1/4 of normal switching frequency.
Short Circuit Protection (SCP)
The GT1510 has internal short circuit protection to protect itself from catastrophic failure under output short
circuit condition. The FB pin voltage is proportional to the output voltage. Whenever FB pin voltage is below
0.5V, the short circuit protection circuit is triggered. As a result, the frequency drop to 1/9 of normal
switching frequency. In short circuit protection mode, the inductor is greatly reduced.
Thermal Protection (OCP)
The internal temperature sensor monitors the junction temperature. It shut down the internal control circuit
and high side PMOS if the junction temperature exceeds 150 oC. The regulator will restart automatically
under the control of soft-start circuit when junction temperature decreases to 100oC.
Under Voltage Lockout (UVLO)
The under voltage lockout circuit of the GT1510 assures that the high-side MOSFET driver outputs remain in
GMOS Technology Corp.
www.gmos-semi.com
5/7
Free Datasheet http://www.datasheet4u.com/

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