Under 100mW Standby Power Solution (GR8830/8876A/8874) 2010/01/15
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1 Under 100mW Standby Power Solution (GR8830/8876A/8874) 2010/01/15
2 GR8830 Package Sot23-6 and DIP8 package High efficiency Lower standby power Pinning Table 1 Pin description Pin No. Nam Function ` GND COMP RT CS VCC OUT Ground Voltage feedback pin, by connecting a photo-coupler to control the Duty cycle this resistor determine the switching frequency Current sense pin,connect to sense the MOSFET current Power supply pin The output driver for driving the external MOSFET
3 GR8830 Key Features Features Very low startup current Under 0.1w standby power (without changing layout) Jittering for reducing conduction Soft driving for reducing radiation interference Non-audible-noise green mode control Programmable switching frequency Internal soft start Internal slope compensation Over voltage protection (OVP) on VCC pin Over load protection (OLP) Over current protection (OCP) on CS pin Over temperature protection (OTP) on chip
4 GR8830 Application field Typical application market: Adapter, LCD monitor, Set-top box, E-PC and ATX standby power
5 Green mode for high efficiency Green mode Operation Frequency(kHz) GR8830/76A/74 Competitor IC Output current
6 Burst mode for reducing power consumption Vcomp Gate 20k
7 Soft driving for reducing radiation Gate waveform 7V 7V Gate Comparator Gate driver
8 Soft start soft start signal 3.5ms Lower dominate COMP signal soft start signal 5.5V 0.6V 0.4V 0.2V COMP Slope compensated CS Soft start dominate COMP dominate Soft start period ~ 3.5ms
9 GR8830 High-efficiency CEC Level 5 =0.0626ln(Po)+0.622=80.3% GR8830 test condition=12v/1.5a I_ Load (A) 25% 50% 75% 100% Av. η (%) LX7530/1 I_ Load (A) 25% 50% 75% 100% Av. η (%) 90Vac Vac Vac Vac Vac Vac Vac Vac
10 GR8830 lower standby power Application circuit 1 (Without changing layout ) 4.5M ohm Without Bleeding Resistor Vin (rms) 90V 120V 230V Pin (W) 43mw 45mw 65mw 264V 75mw Bleeding Resistor=3MΩ Vin (rms) 90V 120V 240V 264V Pin (W) 50mw 52mw 80mw 91mw
11 GR8830 lower standby power Application circuit 2 (lower standby power) GR8830 Vin (rms) 90V 120V 230V 264V Pin (W) 42mw 44mw 64mw 72.5mw 2M ohm LX7531 Vin (rms) 90V 120V 230V 264V Pin (W) 92mw 89mw 95mw 99.8mw
12 GR8830 lower standby power Application circuit 3 (lower standby power)
13 GR8830 Compare with competitors Max start-up current Operating current Frequency trembling GR8830 8uA 2mA +/-6% LX7530/1 12uA 2.65mA +/-4khz OX2263 3us 1.4mA +/-3% Leading edge blanking 350ns 240ns 375ns OCP compensation Over voltage protection Programmable switch frequency yes 26v/27v/28v 100KΩ/65KhZ yes 26.8V/28V/29.2V 100KΩ/65KhZ yes 100KΩ/65KhZ Power saving <100mw >100mW >200mW Soft driving for reducing Radiation yes no no
14 GR8876A/74 Package Sop8 package High efficiency Lower standby power Pinning Table 1 Pin description Pin No Name RT COMP CS GND OUT VCC NC HV Connecting a resistor to ground, this resistor determine the switching frequency Voltage feedback pin, by connecting a photo-coupler to control the duty cycle Current sense pin,connect to sense the MOSFET current Ground The output driver for driving the external MOSFET Power supply pin Unconnected pin Function This pin provides the start up current. When VLO(ON) is tripped, this HV loop will be off thus limit the power loss on the startup circuit
15 GR8876A/74 Key Features Features High-voltage startup Very low startup current Under 70mW standby power (without changing layout) Jittering for reducing conduction soft driving for reducing EMI Non-audible-noise green mode control Programmable switching frequency Internal soft start Internal slope compensation Over voltage protection (OVP) on VCC pin Over load protection (OLP) Over current protection (OCP) on CS pin
16 GR8876A/74 Application Field Typical application market: Adapter, LCD monitor/tv Notebook adapter and Set-top box
17 GR8876A High-efficiency CEC Level 5 =87% GR8876A test condition=19.5v/3a I_ Load (A) 25% 50% 75% 100% Av. η (%) LX7550 I_ Load (A) 25% 50% 75% 100% Av. η (%) 90Vac Vac Vac Vac Vac Vac Vac Vac
18 GR8876A/74 Lower standby power Test Condition:1. Bleeding Resistor=open Input (Vrms) 90V 110V 230V 264V GR8876A Pin (W) 53.9mw 60.4mw 78.1mw 87.5mw GR8874 Pin (W) 40.1mw 41.9mw 59mw 67.3mw LX7550 Pin (W) 66.5mw 68.4mw 87.8mw 94.6mw
19 GR8876A/74 Compare with competitors GR8876A GR8874 LX7550 HV start up Operating current Frequency trembling Leading edge blanking yes 2.2mA +/-6% 350ns yes 2.2mA +/-6% 350ns yes 2.9mA +/-4kHz 250ns OCP compensation 0.8V/0.85V/0.9V 0.8V/0.85V/0.9V 0.8V/0.85V/0.9V Over voltage protection Programmable switch frequency OTP pin Power saving Soft start 27v/28v/29v 100KΩ/65KHZ no Under 90mw YES 27v/28v/29v 100KΩ/65KHZ no Under 70mw YES 24.5v/26v/27.5v 65kHz OTP Under 100mW NO
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WS3254 Product Description
High Precision Primary-Side Off-line PWM Power Switch Features 5uA ultra-low startup current 2mA Low operating current ±5% Constant Voltage Regulation at Universal AC input Primary-side Sensing and Regulation
WS3256 Product Description
High Precision Primary-Side Off-line PWM Power Switch Features 5uA ultra-low startup current 2mA Low operating current ±5% Constant Voltage Regulation at Universal AC input Primary-side Sensing and Regulation
DP9126IX. Non-Isolated Buck APFC Offline LED Power Switch FEATURES GENERAL DESCRIPTION APPLICATIONS TYPICAL APPLICATION CIRCUIT
Non-Isolated Buck APFC Offline LED Power Switch DP9126IX FEATURES Active PFC for High PF and Low THD PF>0.9 with Universal Input Built-in HV Startup and IC Power Supply Circuit Internal 650V Power MOSFET
idesyn id8802 2A, 23V, Synchronous Step-Down DC/DC
2A, 23V, Synchronous Step-Down DC/DC General Description Applications The id8802 is a 340kHz fixed frequency PWM synchronous step-down regulator. The id8802 is operated from 4.5V to 23V, the generated
DP9122 Non-isolated Quasi-Resonant Buck LED Power Switch
FEATURES GENERAL DESCRIPTION Integrated with 500V MOSFET No Auxiliary Winding Needed Quasi-Resonant for High Efficiency Built-in Thermal Foldback Built-in Charging Circuit for Fast Start-Up ±4% CC Regulation
SHENZHEN DONGKE SEMICONDUCTOR CO., LTD SPECIFICATION
SPECIFICATION 1. DESCRIPTION The DK124 IC is specially design for off-line switch mode power supply, maximum power is 24W. Different from PWM controller and external power separated MOS combination design,
CURRENT MODE PWM+PFM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET
CURRENT MODE PWM+PFM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET DESCRIPTION SD6832 is current mode PWM+PFM controller with built-in highvoltage MOSFET used for SMPS It features low standby power and