PWM IC. G5175 Datasheet

G5175 IC. Datasheet pdf. Equivalent

Part G5175
Description DIGITAL PWM IC
Feature G5175 Low-Power Off-Line Digital Green-Mode PWM Controller DIGITAL PWM IC 1. General Description T.
Manufacture Global Semiconductor
Datasheet
Download G5175 Datasheet



G5175
G5175
Low-Power Off-Line Digital Green-Mode PWM Controller
DIGITAL PWM IC
1. General Description
The G5175 is a high performance AC/DC power
supply controller which uses digital control
technology to build peak current mode PWM
flyback power supplies. The device directly drives
a power BJT and operates in quasi-resonant
mode to provide high efficiency along with a
number of key built-in protection features while
minimizing the external component count,
simplifying EMI design and lowering the total bill
of material cost. The G5175 features a distinctive
soft-start scheme, which allows for fast and yet
smooth start-up with both small and large
capacitive loads.
Global Semiconductor’s innovative proprietary
technology ensures that power supplies built with
the G5175 can achieve both highest average
efficiency and fast yet smooth start-up with a
wide range of capacitive loads, and are ideal for
network power adapter applications.
The G5175 removes the need for secondary
feedback circuitry while achieving excellent line
and load regulation. It also eliminates the need
for loop compensation components while
maintaining stability over all operating conditions.
Pulse-by-pulse waveform analysis allows for a
loop response that is much faster than traditional
solutions, resulting in improved dynamic load
response. The built-in power limit function
enables optimized transformer design in
universal off-line applications and allows for a
wide input voltage range.
Features
Very tight constant voltage and constant
current regulation over entire operating
range
Adaptively controlled soft start-up
enables fast and smooth start-up for a
wide range of capacitive loads (from
330uF to 6000 uF)
Very tight constant voltage regulation
Optimized 72 kHz maximum PWM
switching frequency achieves best size
and efficiency
Primary-side feedback eliminates
opto-isolators and simplifies design
Intrinsically low common mode noise
Adaptive multi-mode PWM/PFM control
improves efficiency
Quasi-resonant operation for highest
overall efficiency
Direct drive of low-cost BJT switch
Dynamic base current control
No external compensation components
required
Built-in short circuit protection and output
overvoltage protection
Built-in current sense resistor short
circuit protection
Constant current control enables output
current limit and overload protection
No audible noise over entire operating
range
Applications
Network power adapters for ADSL,
wireless access points,routers.
Global Semiconductor Co., LTD.
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G5175
G5175
Low-Power Off-Line Digital Green-Mode PWM Controller
2. Products Information
2.1 Pin configuration
VDD
GND
FB
DRV
CS
Pin Configuration: G5175 Series ( SOT23-5 )
Pin Name
VDD
FB
CS
GND
DRV
I/O Description
P Power supply for control logic.
Analog Input Auxiliary voltage sense (used for
I primary regulation).
Analog Input Primary current sense. Used for
I
cycle-by-cycle peak current control and limit.
P Ground.
O Base drive for BJT.
2.2 Marking Information
Part Number
G5175
Marking Information
GAXXX
2.3 Series description
Part Number
G5175-00
G5175-01
G5175-03
G5175-05
Description
Cable Comp = 0mV
Cable Comp = 150mV
Cable Comp = 300mV
Cable Comp = 450mV
Rev.1.3
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