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G1515
High Performance Current Mode PWM Controller
ANALOG PWM IC
1. General Description
The G1515 is a high performance AC/DC power
supply controller for adapter applications
requirements up to 75WIt can meet less than 80
mW standby power.
G1515 is a current mode PWM controller ,It
operates in fixed frequency which is precisely set
internally. It could operate in Extended Burst
Mode at no load or light load, in which mode
switching loss is minimized and the frequency is
adjusted internally. To ensure that power supplies
work quietly, the frequency is set beyond 22 KHz.
Small current is needed when G1515 starts up
and works, thus a large value resistor could be
used in the startup circuit to minimize the standby
power. Slope compensation circuit is integrated
in G1515, which improves system large signal
stability and reduces the possible sub-harmonic
oscillation at high PWM duty cycle.
Frequency shuffling technique is integrated in
G1515, which helps to achieve excellent EMI
performance.
G1515 offers complete protection functions
including cycle-by-cycle current limiting
protection(OCP), over load protection(OLP),VDD
over voltage protection(OVP), VDD over voltage
clamp and under voltage lockout(UVLO).
The G1515 is available in both SOT23-6 and
SOP8 package.
Features
Built-in Soft Start
Random Frequency Adjustment to
Reduce System EMI
Audio Noise Reduction
Short Circuit Protection
Internal Cable Compensation
Extended Burst Mode Control For
Improved Efficiency and Minimum
Standby Power Design
Internal Synchronized Slope
Compensation
Low VDD Startup Current and Low
Operating Current
Leading Edge Blanking on Current
Sense Input
Over Load Protection(OLP) and
Cycle-by-Cycle Current Limiting
Protection(OCP)
VDD Over Voltage
Protection(OVP),Under Voltage
Lockout Protection(UVLO) and Over
Voltage Clamp
Applications
Offline AC/DC flyback converter
Power Adapter
Set-Top Box Power Supplies
Open-frame SMPS
Auxiliary Power Supply for PC and
Server
Digital Cameras and Camcorder
Adapter
Global Semiconductor Co., LTD.
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G1515
High Performance Current Mode PWM Controller
2. Products Information
2.1 Pin configuration
Pin Configuration: G1515 Series
Pin Name
GND
FB
RT
CS
VDD
Gate
NC
I/O Description
P Ground
Feed back input Pin. The PWM duty cycle is
I determined by voltage level into this pin and the
current-sense signal at Pin 4.
I Dual protection pin. Either connected through a
NTC resistor to ground over temperature
shutdown/latch control or connected through
zener to VDD for adjustable over voltage
protection.
I Current sense input.
P Power supply.
O Gate driver output.
Unconnected Pin
2.2 Marking Information
Part Number
G1515A
G1515B
G1515F
Marking Information
9AXXX
9BXXX
9CXXX
Rev. 2.0
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G1515
High Performance Current Mode PWM Controller
2.3 Series description
Part Number
G1515A
G1515A-03
G1515B
G1515F
Description
Outside OTP with NTC, Auto Recovery, JitterSOT23-6
Outside OTP with NTC, Auto Recovery, JitterSOP8
Brown out protect, Auto Recovery, JitterSOT23-6
Programmable Internal Oscillator frequency, JitterSOT23-6
2.4 Block diagram
Figure2.1 G1515 Functional Block Diagram
3. Absolute Maximum Ratings
Description
VDD
Supply current IVDD
FB Input Voltage
Sense Input Voltage
RT Input Voltage
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature TSTG
Package Dissipation RθJA
Absolute Maximum Ratings
40 V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-20 to 150
-55 to 160
200 /W
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G1515
High Performance Current Mode PWM Controller
4. Typical Application
The G1515 contains a controller for a yback circuit.
5. Electrical Characteristics
(TA = 25, VDD=16V, unless otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (Pin5)
IVDD_ST
VDD Start up Current
VDD=14V, Measure Leakage
current into VDD
IOperate
VUVLO(off)
VUVLO(on)
Operation Current
VDD Under Voltage
Lockout exit
VDD Under Voltage
Lockout enter
VFB=3V
VDD_CLAMP VDD clamp
IDD=10mA
VDD_OVP
VDD ovp
Min Typ Max Unit
3 10
1.6 2.5
14.5 15.5 16.5
8 9 10
30 31 32
27 28 29
uA
mA
V
V
V
V
Rev. 2.0
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G1515
High Performance Current Mode PWM Controller
Symbol
Feedback (Pin2)
Parameter
VFB_OPEN
VFB Open Loop Voltage
Test Conditions
DMAX
Max duty cycle
IFB_SHORT
FB pin short circuit current
VRef_burst_H
VRef_burst_L
VTH_PL
TD_PL
The threshold exit burst
mode
The threshold enter burst
mode
Power Limiting FB
Threshold
Power limiting Debounce
time
ZFB_IN
Input Impedance
Current sense (Pin4)
SST Soft start time
VDD=14V,VFB=3V,VCS=0V
TLEB Leading edge blanking time
ZSENSE_IN
Input Impedance
VTH_OC
Oscillator
FOSC
Internal Current Limiting
Normal Oscillation
Frequency
ΔFOSC
Jitter frequency
ΔFTemp
Frequency Temperature
Stability
ΔF_VDD
Frequency Voltage Stability
FBURST
Burst Mode Base
Frequency
Gate driver (Pin6)
VOL Gate Ouput Low Level
VOH Gate Ouput High Level
VCLAMP
Gate Output clamp voltage
Tr Gate rising time
Tf Gate falling time
Protection
VFB=3V,VCS=0V
Io=5mA
Io=20mA
Cload=1nf
Cload=1nf
IRT
VOTP
Output current of RT pin
Threshold voltage for OTP
VRT_OPEN
VTH_OVP
Float voltage at RT pin
External OVP threshold
voltage
Min Typ Max Unit
4.5 5
75 80
0.3
1.2
1.1
3.7
80 88
16
85
96
V
%
mA
V
V
V
ms
K
6 ms
300 ns
40 K
0.75 V
60 65 70 KHz
-4 4 %
1%
1%
22 KHz
1V
6V
14 V
120 nSec
80 nSec
45 50 55
0.95 1 1.05
2.3
4
uA
V
V
V
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