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GS92A5 Schematic ( PDF Datasheet ) - Green Solution Technology

Teilenummer GS92A5
Beschreibung High Performance Single Synchronous Buck Converter
Hersteller Green Solution Technology
Logo Green Solution Technology Logo 




Gesamt 17 Seiten
GS92A5 Datasheet, Funktion
High Performance Single Synchronous Buck Converter
http://www.btian.com.cn
135-9038-5985 Andy
GS92A5
Features
Wide Input Voltage Range3V~28V
Adjustable 0.8V~20V Output Range
±1% Output Voltage Accuracy over Line and
Load
Wide output load range: 0 to 10A
Constant-on-time control scheme for fast
transient and high Efficiency
Programmable Operation Frequency from
100kHz to 600kHz
Selectable Forced PWM or automatic
PFM/PWM mode
45% Under-Voltage Protection
125% Over-Voltage Protection
FB Short Protection
Internal 5V Pre-regulator
External Adjustable Soft-Start and Soft-Stop
Internal Over Temperature Protection
Programmable Over Current Protection
TQFN20-5x5 package
Green Product (RoHS, Lead-Free,
Halogen-Free Compliant)
Applications
Notebook computers
CPU core/IO Supplies
Chip/RAM Supplies
General Description
The GS92A5 is small size chip with a relative
constant on-time synchronous buck switching
converter suitable for applications in notebook
computers and other battery operated portable
devices. Features include very wide input voltage
range, high efficiency and a fast dynamic
response with internal fast response scheme.
The GS92A5 have a unique power save mode,
which can save battery power supply by
decreasing frequency when load current falls
down below preset critical current point.
The fast dynamic transient response means that
buck converter applications based on GS92A5
will provide about 100ns-order response to load
when output voltage falls down or rises up. The
frequency will increase or decrease to meet the
change in output load. Moreover, the GS92A5 will
take the same method to regulate the output
voltage when input voltage changes. When
transient response regulated, the converter will
maintains a new steady-state operation. Both the
transient response state and the new state, the
GS92A5 always has the same on-time.
The GS92A5 is suitable for the solutions which
have the output voltage between 0.8V and 20V.
An external setting resistor and output voltage
can set the on-time, duty-cycle and frequency for
the converter. The integrated gate drivers feature
adaptive shoot-through protection, fast signal
transmission. Additional features include current
limit, soft-start, over-voltage and under-voltage
protection, a Power Good flag and soft discharge
upon shutdown. The GS92A5 is available in
package TQFN20-5x5.
This document is GStek's confidential information. Anyone having confidential obligation to GStek shall keep this document confidential. Any unauthorized
disclosure or use beyond authorized purpose will be considered as violation of confidentiality and criminal and civil liability will be asserted.
Green Solution Technology Co., LTD.
Rev.:0.3
1
Jan-15






GS92A5 Datasheet, Funktion
High Performance Single Synchronous Buck Converter
http://www.btian.com.cn
135-9038-5985 Andy
GS92A5
Absolute Maximum Rating (Note 1)
Parameter
VAIN to GND
TON to GND
CS to GND
VCC to GND
EN to GND
FB, VOUT to GND
BOOT Voltage
BOOT to LX Voltage
LGATE to GND
VLX to GND
DC
<200ns
Package Power Dissipation at TA25°C
Junction Temperature
Storage Temperature
Lead Temperature (Soldering) 10S
ESD (Human Body Mode) (Note 2)
ESD (Machine Mode) (Note 2)
Thermal Information (Note 3)
Parameter
Thermal Resistance Junction to Ambient
Symbol
VAIN
VTON
VCS
VCC
VEN
VFB, VOUT
VBOOT-GND
VBOOT-VVLX
VGL
VVLX
PD_TQFN20-5x5
TJ
TSTG
TLEAD
VESD_HBM
VESD_MM
Symbol
θJA_TQFN20-5x5
Limits
-0.3 ~ 30
-0.3 ~ 30
-0.3 ~ 30
-0.3 ~ 6
-0.3 ~ 30
-0.3 ~ 6
-0.3 ~ 40
-0.3 ~ 6
-0.3 ~ 6
- 0.7V~30V
-8V~32V
4228
- 45 ~ 150
- 55 ~ 150
260
2K
200
Limits
23.65
Units
V
V
V
V
V
V
V
V
V
V
mW
°C
°C
°C
V
V
Units
°C/W
Recommend Operating Condition (Note 4)
Parameter
Symbol
VIN to GND (Note 5)
VAIN to GND (Note 5)
VCC to GND
EN/DEM to GND
Junction Temperature
Ambient Temperature
VIN
VAIN
VCC
VEN/DEM
TJ
TA
Limits
3~28
6~28
4.5~5.5
VEN/DEM= VAIN
-40 ~125
-40 ~ 85
Units
V
V
V
V
°C
°C
Green Solution Technology Co., LTD.
Rev.:0.3
6
Jan-15

6 Page









GS92A5 pdf, datenblatt
High Performance Single Synchronous Buck Converter
http://www.btian.com.cn
135-9038-5985 Andy
GS92A5
Application Information
The GS92A5 is small size chip with a relative
High Side Switch On-Time Count
constant on-time synchronous buck switching
The on-time is decided by the external setting resistor,
converter suitable for applications in notebook
and the input voltage. Looking at the TON pin, the input
computers and other battery operated portable
voltage is converted to current which is inversely
devices. Features include wide input voltage
proportional to itself by dividing the external setting
range, high efficiency and fast dynamic response.
resistor. The input voltage-proportional current is used
System Clock Generator and PWM Control
to charge an internal capacitor from zero volts. When
The on-time of GS92A5 can be set by an external the voltage between two terminals of the capacitor
setting resistor from input voltage to TON Pin. The reaches to the internal setting voltage, on-time one-shot
converter maintains the on-time width as loop pulse is generated, and then upper power MOSFET is
feedback path exists between the GS92A5 converter, turned off and lower power MOSFET is turned on.
low pass filter and voltage divider. For a given input We can count the on-time and switching frequency
voltage buck application, the feedback maintains the according to the equation below:
constant on-time width. Due to the constant resistor TON=(VOUT×RTONx8p) / (VIN-0.8)
for VOUT<=2.5V
and input voltage, the GS92A5 based buck converter If VOUT is higher than 2.5V, please set VOUT PIN
has the relative constant frequency. Moreover, the voltage equal to 2.5V by divider resistors. And, the
GS92A5 can increase the duty-cycle automatically frequency can be calculated as equation below:
as input voltage falls down. Because of the constant TON=( RTONx20p) / (VIN-0.8)
on-time in each switching period, the converter Then, the switching frequency is:
for VOUT>2.5V
maintains the relative frequency when the input
voltage changes
At the beginning of each switching cycle, upper
Fsw=VOUT/ (VIN×TON)
RTON is a resistor connected from the input supply (VIN)
to the TON pin.
power MOSFET is turned on, after typical fixed For heavy load (more than 8A) application, due to
on-time, the upper MOSFET is turned off, and then ground bounced and the high impedance of RTON, the
lower power MOSFET is turned on after internal TON pin should always be bypassed to GND using a
dead time. The upper MOSFET will not be turned on several nF-order ceramic capacitor for reliable system
at the beginning of next cycle until output voltage falls operation.
down below the preset voltage and the dead time EN, PFM/PWM Mode and Shutdown Soft-Discharge
passes. The same events repeat the following The EN/DEM pin enables the power supply. When
switching cycles. To avoid the surge inductor current EN/DEM is tied to high voltage (over VEN_H) the
during large load transient, a minimum Off-time is GS92A5 is enabled and diode-emulated mode (DEM,
added. Typical minimum off-time is around 440ns. which is power save mode) will be also enabled. When
The too small on-time can affect soft-start and the EN/DEM is floating or tri-stated, an internal tri-stated
anti-noise ability, so in order to avoid the on-time too judged logic module will activate the controller and the
small to be eliminated; a minimum on-time is set to DEM Mode will be disabled.
around 110ns. This should to be noted in the small In DEM mode, when the loads goes low, GS92A5 starts
duty applications.
power save mode in order to maintain the on-time and
Green Solution Technology Co., LTD.
Rev.:0.3
12
Jan-15

12 Page





SeitenGesamt 17 Seiten
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