Grenergy GR8837RCG, GR8837RJG Schematics
GR8837R
Green-Mode PWM Controller with Hiccup Protection
Features
Current Mode Control
Standby Power below 100mW
Under-Voltage Lockout (UVLO)
Non-Audible-Noise Green-Mode Control
65KHz Switching Frequency
Internal Leading-Edge Blanking
Internal Slope Compensation
Internal Soft Start
Gate Output Voltage Clamp
Jitter and Soft Driving for Reducing EMI
External OVP Latch Mode
External OTP Latch Mode
Over-Load Protection (OLP)- -Auto Recovery
Mode
Description
The GR8837R is a highly-integrated, low startup
current, current mode PWM controller with
green-mode function. The integrated functions also
include the leading-edge blanking of the current
sensing, internal slope compensation, soft start
OLP, and OCP. Besides, The RTL pin latch function
by injecting a high over 3.5V to provide OVP latch
off and low below 1V to provide OTP latch off
protection. These functions enable the power supply
to easily meet even the strictest power
requirements.
The GR8837R improves the performance and
reduces the cost of power supplies. It is with 8-pin
DIP and 6-pin SOT-26 package.
Vcc OVP Protection- Auto Recovery Mode
300mA Driving Capability
Application
Battery Charger
Open Frame SMPS
Switching AC/DC Adapter
Ordering and Marking Information
DIP-8
.
SOT-26
Code 1 8 9 A B
Year 2008 2009 2010 2011
Code 2 1 2 3 4 9 A B C
Month Jan. Feb. Mar. Apr.
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.
2012.04. Ver. 1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
● ● ●
G H I J
2016 2017 2018 2019
Sep. Oct. Nov. Dec.
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GR8837R
Pin Configuration
GND
1
6
OUT
COMP
2
5
VCC
RTL
3 4
CS
Pin Description
Pin No. Name Function
1 GND Ground pin
2 COMP Voltage feedback pin, by connecting a photo-coupler to control the duty cycle
3 RTL
4 CS Current sense pin, connect to sense the MOSFET current
Resistor trigger latch off which a high over 3.5V for OVP latch off and a low below
1V for OTP latch
5 VCC Power supply pin
6 OUT The output driver for driving the external MOSFET
Absolute Maximum Ratings
Supply voltage VCC --------------------------------------------------------------------------------------------------------- 30V
COMP, RTL, CS ---------------------------------------------------------------------------------------------------- -0.3 ~ 7V
OUT ----------------------------------------------------------------------------------------------------------- -0.3 ~ VCC + 0.3V
Junction temperature ------------------------------------------------------------------------------------------------------- 150℃
Operating ambient temperature ------------------------------------------------------------------------------ -20℃ ~ 85℃
Storage temperature range ---------------------------------------------------------------------------------- -65℃ ~ 150 ℃
SOT-26 package thermal resistance (junction to ambient) -------------------------------------------------- 250℃/W
Power dissipation (SOT-26, at ambient temperature = 85℃) ------------------------------------------------ 250mW
Power dissipation (DIP-8, at ambient temperature = 85℃) --------------------------------------------------- 650mW
Lead temperature (All Pb free packages, soldering, 10 sec) -------------------------------------------------- 260℃
ESD voltage protection, human body model -------------------------------------------------------------------------- 2KV
ESD voltage protection, machine model ------------------------------------------------------------------------------ 200V
2012.04. Ver. 1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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5
GR8837R
Electrical Characteristics
Parameter Pin Min. Typ. Max. Unit
SUPPLY VOLTAGE
Startup Current (VCC=UVLO on - 1V) 5
Operating Current (with 1nF load on OUT pin), Vcomp = 0V 5
Operating Current (with 1nF load on OUT pin), Vcomp = 2.5V
Operating Current (with 1nF load on OUT pin), Protection
Tripped (OLP, OVP)
UVLO(off) 5
UVLO(on) 5
OVP Level on VCC Pin –Auto Recovery Mode 5
VCC level in Latch Mode (3Meg Start-Up Resistor) 5
Holding Current at Latch Mode (VCC=5V) 20 uA
Latch Mode Release Voltage 5
VOLTAGE FEEDBACK
Short Circuit Current, Vcomp = 0V 2
(VCC = 15.0V & TA = +25℃,unless otherwise specified.)
8 15 uA
800 uA
1 2 3 mA
5
0.4 0.7 1 mA
5.8 6.8 7.8 V
10.3 11.3 12.3 V
27 28 29 V
6 V
3.2 V
0.8 mA
Open Loop Voltage, COMP Pin Open 2
Green-Mode Start Voltage 2
Burst Mode Start Voltage 2
CURRENT SENSING
Maximum Input Voltage, Vcs(off)- Auto Recovery Mode 4
Leading-Edge Blanking Time 4
Input Impedance 4
Delay to Output 4 100 nS
OSCILLATOR
Frequency - 60 65 70 KHz
Jitter Frequency - +6 %
Green Mode Frequency - 20 22 25 KHz
Temp. Stability
Voltage Stability (VCC = 11V~25V) - 3 %
GATE DRIVER OUTPUT
Output Low Level, VCC = 15V, Io = 20mA 6
(-
40°C ~ 110°C) -
4.4 5.5 V
1.5 V
0.80 0.85 0.9 V
350
1 M
1 V
0.85 V
nS
5 %
Ω
Output High Level, VCC = 15V, Io = 20mA 6
Rising Time, Load Capacitance = 1000pF 6
Falling Time, Load Capacitance = 1000pF 6
VGATE-Clamp (VCC = 25V ) 6
8 V
200 nS
80 nS
12 13 V
2012.04. Ver. 1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8837R
OLP SECTION
OLP Trip Level, Vcomp (OLP) - 3.5 V
OLP Delay Time - 60 mS
PWM SECTION
Maximum Duty Cycle - 70 75 80 %
RTL SECTION
Over Voltage Protection Threshold Voltage 3
3.2 3.5 3.8 V
OVP Debounce Time 3
Over Temperature Protection Threshold Voltage 3
OTP Debounce Time
Output Current from RTL Pin
RTL Pin Voltage When Floating
100 uS
0.95 1 1.05 V
3
3
3
75
1.8
100
80
2.4
85
3.0
us
uA
V
2012.04. Ver. 1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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Typical Performance Characteristics
GR8837R
2012.04. Ver. 1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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