Grenergy GR8837CCG, GR8837CJG Schematics

1

Preliminary GR8837C

J: DIP-8
C: SOT-26

GR8837C

Package Code

RoHS Code

G: Green (Halogen Free) Device
L: PB Free Device

GR8837C

X X XXX

Serial No.

Code 1

Code 2

Code 1

37C X

X

X X X

Serial No.

Code 2

Year

2008

2009

2010

2011

2016

2017

2018

2019

Month

Jan.

Feb.

Mar.

Apr.

Sep.

Oct.

Nov.

Dec.

Green-Mode PWM Controller with 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
 Over-Load Protection (OLP)-Auto Recovery

Mode

 Vcc OVP Protection- Auto Recovery Mode

 300mA Driving Capability

Description

The GR8837C is a highly-integrated, low startup
current, current mode PWM controller with
green-mode function. The integr ated functions also
include the leading-edge blanking of the current
sensing, internal slope compensation, soft start
OLP, and OVP.These functions enable the power
supply to easily meet even the strictest power
requirements.
The GR8837C improves the performance and
reduces the cost of po wer supplies. It is with 8-pin
DIP and 6-pin SOT-26 package

O

Application

 Switching AC/DC Adapter
 Open Frame SMPS
 Battery Charger

Ordering and Marking Information

DIP-8

SOT-26

Code 1 8 9 A B

Code 2 1 2 3 4 9 A B C

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.

● ● ●

G H I J

2012.02 Ver. F .Copyright Grenergy OPTO, Inc. www.grenergy-ic.com

2

Preliminary GR8837C

GND

COMP

BNO

OUT

VCC

CS

1

2

3 4

5

6

Pin Configuration

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

Brownout protection pin. Connect a resistor divider between this pin and bulk

3 BNO

4 CS Current sense pin, connect to sense the MOSFET current
5 VCC Power supply pin
6 OUT The output driver for driving the external MOSFET

capacitor voltage to set the brownout level. If the voltage is less than threshold
voltage, the PWM output will be disabled

Absolute Maximum Ratings

Supply voltage VCC --------------------------------------------------------------------------------------------------------- 30V
COMP, BNO, 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

2012.02 Ver. F .Copyright Grenergy OPTO, Inc. www.grenergy-ic.com

3

Preliminary GR8837C

Electrical Characteristics (VCC = 15.0V & TA = +25℃,unless otherwise specified.)

Parameter Pin Min. Typ. Max. Unit

SUPPLY VOLTAGE

Startup Current (VCC=UVLO on - 1V) 5 8 15 uA
Operating Current (with 1nF load on OUT pin), Vcom p = 0V 5 800 uA
Operating Current (with 1nF load on OUT pin), Vcomp = 2.5V 5 2 mA
Operating Current (with 1nF load on OUT pin), Protection
Tripped (OLP, OVP)
UVLO(off) 5 5.8 6.8 7.8 V
UVLO(on) 5 10.3 11.3 12.3 V
OVP Level on VCC Pin- Auto Recovery Mode 5 27 28 29 V
VCC Level in Latch Mode (3Meg start-up resistor) 5 6 V

VOLTAGE FEEDBACK

Short Circuit Current, Vcomp = 0V 2 0.8 mA
Open Loop Voltage, COMP Pin Open 2 4.4 5.5 V
Green-Mode Start Voltage 2 1.5 V
Burst Mode Start Voltage 2 0.85 V

CURRENT SENSING

Maximum Input Voltage, Vcs(off)-Auto Recover y Mode 4 0.80 0.85 0.9 V
Leading-Edge Blanking Time 4 350 nS

Input Impedance 4 1
Delay to Output 4 100 nS

5 0.7 mA

mΩ

OSCILLATOR

Frequency - 60 65 70 KHz
Jitter Frequency - +6 %
Green Mode Frequency - 20 22 25 KHz
Temp. Stability (-40°C ~ 110°C)
Voltage Stability (VCC = 11V~25V) - 3 %

GATE DRIVER OUTPUT

Output Low Level, VCC = 15V, Io = 20mA 6 1 V
Output High Level, VCC = 15V, Io = 20mA 6 8 V
Rising Time, Load Capacitance = 1000pF 6 200 nS
Falling Time, Load Capacitance = 1000pF 6 80 nS
VGATE-Clamp (VCC = 25V ) 6 13 V

OLP SECTION

OLP Trip Level, Vcomp (OLP) - 3.5 V
OLP Delay Time - 60 mS

2012.02 Ver. F .Copyright Grenergy OPTO, Inc. www.grenergy-ic.com

- 5 %

4

Preliminary GR8837C

PWM SECTION

Maximum Duty Cycle - 70 75 80 %

Brownout Function

Brownout Turn-On Trip Level 1.1 V
Brownout Turn-Off Trip Level 0.8 V

2012.02 Ver. F .Copyright Grenergy OPTO, Inc. www.grenergy-ic.com

5

Preliminary GR8837C

UVLO (on) (V)

Fig. 1 UVLO (on) vs. Temperature

10.3

10.4

10.5

10.6

10.7

10.8

-40

0

40

80

120 125

Temperature (℃)

Temperature (℃)

6.5

6.7

6.8

7.0

6.6

-40

0

40

80

120 125

6.9

UVLO (off) (V)

Fig. 2 UVLO (off) vs. Temperature

VDD Start up current (uA)

Fig. 3 VDD Start up current vs. Temperature

2.0

4.0

6.0

8.0

10.0

12.0

-40

0

40

80

120 125

Temperature (℃)

Operating current (mA)

Fig. 4

Operating current vs. Temperature

1.2

1.4

1.6

1.8

2.0

2.2

-40

0

40

80

120

125

Temperature (℃)

OLP-Trip Level (V)

Fig. 5 OLP Trip Level vs. Temperature

-

-40

0

40

80

120 125

3.0

3.2

3.4

3.6

3.8

4.0

Temperature (℃)

Maximum Input Voltage of CS pin(V)

Fig. 6 Maximum Input Voltage of CS pin vs. Temperature

-40

0

40

80

120 125

0.85

0.86

0.87

0.88

0.89

0.90

Temperature (℃)

Typical Performance Characteristics

2012.02 Ver. F .Copyright Grenergy OPTO, Inc. www.grenergy-ic.com