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PDF ( 数据手册 , 数据表 ) GR8836

零件编号 GR8836
描述 Green-Mode PWM Controller
制造商 Grenergy
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GR8836 数据手册, 描述, 功能
GR8836
Green-Mode PWM Controller with Integrated Protections
Features
Current mode control
Very low startup current
Under-voltage lockout (UVLO)
Non-audible-noise green-mode control
Programmable switching frequency
Cycle-by-cycle peak current limiting
Internal leading-edge blanking
Internal slope compensation
Internal soft start
Gate output voltage clamp
Over-voltage protection (OVP) on VCC pin
Over-load protection (OLP)
Over-current protection (OCP) on CS pin
300mA driving capability
Applications
Switching AC/DC power adapter
Battery charger
Open-frame SMPS
Description
The GR8836 is a highly-integrated, low startup
current, current mode PWM controller with
green-mode function. This function enables the
power supply to easily meet even the strictest
power conservation requirements. The integrated
functions also include the leading-edge blanking
of the current sensing, internal slope com-
pensation, cycle-by-cycle peak current limiting,
and soft start. OLP, OCP and OVP provide
protection performance for fault conditions. To
protect the external power MOSFET from being
damaged by supply over voltage, the GR8836
OUT pin voltage is clamped to about 18V. The
GR8836 improves the performance and reduces
the cost of power supplies. It is with 8-pin DIP and
6-pin SOT-26 package.
Ordering and Marking Information
DIP-8
SOT-26
Code 1 8 9 A B
GH I J
Year 2008 2009 2010 2011
2016 2017 2018 2019
Code 2 1 2 3 4 ● ● ● 9 A B C
Month Jan. Feb. Mar. Apr.
Sep. Oct. Nov. Dec.
Grenergy OPTO Inc. reserves the right to make changes to improve reliability or manufacture ability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
2012.02.Ver. 1.3 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
1
Free Datasheet http://www.0PDF.com







GR8836 pdf, 数据表
Over-voltage Protection (OVP) on VCC
To prevent power MOSFET from being damaged,
the GR8836 is implemented an OVP function on
VCC. When the VCC voltage is higher than the
OVP threshold voltage, the output gate driver circuit
will be shut down immediately to stop the switching
of power MOSFET.
The VCC OVP function is an auto-recovery type
protection. If OVP happens, the pulses will be
stopped and recover at the next UVLO on. The
GR8836 is working in a hiccup mode.
Improve EOS Immunity on VCC Pin
If the auxiliary power supplies the GR8836 is too
high above 20V, to prevent the GR8836 from being
damaged due to over stress of unexpected
environmental energy such as ESD or surge, the
user could add a resistor on VCC pin to improve the
immunity. The value is around few tens of Ohms. A
51 Ohm is recommended.
Gate Clamp
Driver output is clamped by an internal 18V
clamping circuit to prevent from undesired
over-voltage gate signals. And under the conditions
listed below, the gate output will turn off immediately
to protect the power circuit.
Fault Protection
There are several critical protections integrated in
the
. CS pin floating
. RT pin floating
. RT pin short to ground
. Secondary rectify diode short protection
. Comp pin floating
2012.02.Ver. 1.3 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
GR8836
8
Free Datasheet http://www.0PDF.com














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