PWM IC. G5178 Datasheet

G5178 IC. Datasheet pdf. Equivalent

Part G5178
Description DIGITAL PWM IC
Feature G5178 Low-Power Off-Line Digital Green-Mode PWM Controller –– DIGITAL PWM IC 1.0 General Descripti.
Manufacture Global Semiconductor
Datasheet
Download G5178 Datasheet



G5178
G5178
Low-Power Off-Line Digital Green-Mode PWM Controller
––
DIGITAL PWM IC
1.0 General Description
The G5178 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 together
with an external active device (depletion mode
NFET or NPN BJT) provides a fast start-up
meanwhile achieving ultra-low no-load power
consumption. 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 G5178 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, for both one-time and
repetitive load transient. The built-in power limit
function enables optimized transformer design
in universal off-line applications and allows for a
wide input voltage range.
Global Semiconductor’s innovative proprietary
technology ensures that power supplies built
with the G5178 can achieve both highest
average efficiency and zero no-load power
consumption, and have fast dynamic load
response in a compact form factor. The active
start-up scheme enables shortest possible
start-up time without sacrificing no-load power
loss.
Features
Very tight constant voltage and constant
current regulation over entire operating
range
Zero power consumption at no-load with
lowest system cost (< 5mW at 230Vac with
typical application circuit)
Intelligent low power management achieves
ultra-low operating current at no-load
Complies with EPA 2.0 energy-efficiency
specifications with ample margin
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
Primary-side feedback eliminates opto-
isolators and simplifies design
Optimized 72 kHZ PWM switching frequency
achieves best size and efficiency
Built-in soft start
Built-in short circuit protection and output
overvoltage protection
Built-in current sense resistor short circuit
protection
No audible noise over entire operating
Applications
Compact low power AC/DC adapters/
chargers for cell phones,PDAs,digital
still cameras
Linear AC/DC replacement
Global Semiconductor Co., LTD.
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G5178
G5178
Low-Power Off-Line Digital Green-Mode PWM Controller
2.0 Products Information
2.1 Pin configuration
VDD
FB
ASU
DRV
GND
CS
Pin Configuration: G5178 Series ( Sot23-6 )
Pin Name
VDD
FB
ASU
CS
GND
DRV
I/O Description
P Power supply for control logic.
I
Analog Input Auxiliary voltage sense (used for
primary regulation).
Control signal for active start-up device (BJT or
O
depletion NFET).
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
G5178
2.3 Series description
Marking Information
GDXXX
Part Number
G5178-00
Description
Cable Comp = 0mV
Rev 1.0
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