GR8836CG [GRENERGY]
Green-Mode PWM Controller with Integrated Protections;
| 型号： | GR8836CG |
| 厂家： | 
Grenergy Opto, lnc. |
| 描述： | Green-Mode PWM Controller with Integrated Protections |
| 文件： | 总13页 (文件大小：857K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GR8836
Green-Mode PWM Controller with Integrated Protections
Features
Description
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Current mode control
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.
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
Over-temperature protection (OTP) on chip
300mA driving capability
Applications
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Switching AC/DC power adapter
Battery charger
Open-frame SMPS
Ordering and Marking Information
DIP-8
SOT-26
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.
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
1
GR8836
Pin Configuration
DIP-8 (TOP VIEW)
SOT-26 (TOP VIEW)
Pin Description
Pin No.
Name
GND
COMP
RT
Function
1
2
3
4
5
6
Ground
Voltage feedback pin, by connecting a photo-coupler to control the duty cycle
Connecting a resistor to ground, this resistor determine the switching frequency
Current sense pin, connect to sense the MOSFET current
Power supply pin
CS
VCC
OUT
The output driver for driving the external MOSFET
Note: Pin No. is only for SOT-26 package.
Absolute Maximum Ratings
Supply voltage VCC --------------------------------------------------------------------------------------------------------- 30V
COMP, RT, 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 ------------------------------------------------------------------------------ 250 /W
Power dissipation (SOT-26, at ambient temperature = 85
Power dissipation (DIP-8, at ambient temperature = 85
)
------------------------------------------------ 250mW
--------------------------------------------------- 650mW
)
Lead temperature (All Pb free packages, soldering, 10 sec) -------------------------------------------------- 260
ESD voltage protection, human body model -------------------------------------------------------------------------- 3KV
ESD voltage protection, machine model ------------------------------------------------------------------------------ 200V
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Recommended Operating Conditions
Item
Min.
12
Max.
25
Unit
V
Supply voltage VCC
Switching frequency
50
130
KHz
Block Diagram
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Electrical Characteristics (T
A
= +25
unless otherwise stated, VCC = 15.0V)
Parameter
Pin
Min.
Typ.
Max.
Unit
SUPPLY VOLTAGE
Startup current
5
5
5
8
20
uA
mA
mA
Operating current (with 1nF load on OUT pin), Vcomp = 0V
2.0
2.5
Operating current (with 1nF load on OUT pin), Vcomp = 2.5V
Operating current (with 1nF load on OUT pin), protection tripped
5
0.5
mA
(OLP, OVP)
UVLO(off)
5
5
5
8.0
9.0
15.0
28
10.0
17
V
V
V
UVLO(on)
13.3
26.5
OVP level on VCC pin
29.5
VOLTAGE FEEDBACK
Short circuit current, Vcomp = 0V
2
2
2
1
mA
V
Open loop voltage, COMP pin open
Green-mode threshold voltage
4.5
1.8
V
CURRENT SENSING
Maximum input voltage, Vcs (off)
4
4
4
4
0.85
1
0.90
350
0.95
V
nS
M
Leading-edge blanking time
Input impedance
Delay to Output
100
nS
OSCILLATOR
Frequency (RT = 100K
Jitter frequency
)
3
3
3
3
3
60
18
65
3
70
KHz
%
Green mode frequency (RT = 100K
Temp. stability (-40°C ~ 110°C)
Voltage stability (VCC = 11V ~ 25V)
GATE DRIVER OUTPUT
)
22
30
3
KHz
%
1
%
Output low level, VCC = 15V, Io = 20mA
Output high level, VCC = 15V, Io = 20mA
Rising time, load capacitance = 1000pF
Falling time, load capacitance = 1000pF
VGATE-clamp (VCC = 25V )
6
6
6
6
6
1
V
V
8
250
70
nS
nS
V
18
OLP
OLP trip level, Vcomp (OLP)
-
-
3.7
60
V
OLP delay time , Fs = 65KHz
mS
PWM SECTION
Maximum duty cycle
-
-
70
75
80
%
Soft start time, Fs = 65KHz
3.5
mS
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
OTP
OTP trip level
-
160
135
OTP recovery level
-
Note: Pin No. is only for SOT-26 package.
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Typical Performance Characteristics
12
16.0
15.6
15.2
11.2
10.4
9.6
14.8
14.4
14.0
8.8
8
-40
0
40
80
120 125
-40
0
40
80
120 125
Temperature (°C)
Temperature (°C)
Fig. 1 UVLO (on) vs. Temperature
Fig. 2 UVLO (off ) vs. Temperature
26
24
22
20
18
16
70
68
66
64
62
60
-40
0
40
80
120 125
-40
0
40
80
120 125
Temperature (°C)
Temperature (°C)
Fig. 3 Frequency vs. Temperature
Fig. 4 Green Mode Frequency vs. Temperature
70
78
76
68
66
64
74
72
62
70
60
68
11 12
14
16
18
20
22
24 25
11 12
14
16
18
20
22
24 25
Vcc (V)
Vcc (V)
Fig. 5 Frequency vs. Vcc
Fig. 6 Max Duty vs. Vcc
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Typical Performance Characteristics
(Cont.)
66
64
62
60
58
56
1.4
1.2
1.0
0.8
0.6
0.4
120 125
80
120 125
-40
0
40
-40
0
40
80
Temperature (°C)
Temperature (°C)
Fig. 7 Short Circuit Current (mA) vs. Temperature
Fig. 8 OLP Delay Time vs. Temperature
0.9
29.5
29
0.88
0.86
0.84
0.82
0.8
28.5
28
27.5
27
120 125
120 125
-40
0
40
80
-40
0
40
80
Temperature (°C)
Temperature (°C)
Fig. 9 OCP (V) vs. Temperature
Fig. 10 Vcc OVP (V) vs. Temperature
4.2
4.0
3.8
3.6
3.4
3.2
6.0
5.5
5.0
4.5
4.0
3.5
-40
0
40
80
120 125
120 125
-40
0
40
80
Temperature (°C)
Temperature (°C)
Fig. 11 VCOMP open loop voltage vs. Temperature
Fig. 12 OLP-Trip Level vs. Temperature
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Application Information
Start-up Current
Green-Mode Operation
The typical start-up current is 8uA. Very low
start-up current allows the PWM controller to
increase the value of start-up resistor and then
reduce the power dissipation on it.
When the load decreases to an extent, the
frequency of the controller will decrease so as to
reduce the system power consumption. The
minimum frequency is about 20 KHz, which is
outside the audio range
.
Under-voltage Lockout (UVLO)
A hysteresis UVLO comparator is implemented in
GR8836, then the turn-on and turn-off thresholds
level are fixed at 15V and 9V respectively. This
hysteresis shown in Fig.13 ensures that the start-up
capacitor will be adequate to supply the chip during
start-up.
Leading-edge Blanking (LEB)
Each time the power MOSFET is switched on, a
turn-on spike will inevitably occur at the sense
resistor. To avoid fault trigger, a 350ns leading-edge
blanking time is built in. Conventional RC filtering
can therefore be omitted. During this blanking
period, the current-limit comparator is disabled and
can not switch off the gate driver.
Internal Slope Compensation
A built-in slope compensation circuit is constructed
in GR8836. When the switch is on, a ramp voltage
is added to the sensed voltage across the CS pin,
which helps to stabilize the system and prevent
Fig.13
sub-harmonic oscillations
.
Soft Start
Over-load Protection (OLP)
During initial power on, the GR8836 provides soft
start function. It effectively suppresses the start up
peak current to reduce the power MOSFET drain
voltage especially at high line.
The controller has over load protection function.
An internal circuit detects the load level, when the
load is larger than a threshold and the condition
lasts more than 60ms, the gate output will keep low
level. Then VCC decreases below UVLO off level,
the controller resets again. Fig.14 shows the
waveform of the OLP operation.
Oscillator
The maximum duty-cycle of internal oscillator is
limited about 75% to avoid the transformer
saturation.
The frequency of the oscillator is
decided by an external resistor connected from RT
pin to ground.
fosc = 6500KHz/R (Kohm)
Where R is the resistor connected at RT pin.
A
100Kohm resistor results in 65KHz switching
frequency. The recommended range of oscillation
frequency is 50 KHz~130 KHz
.
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
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
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Typical Application Circuit
F1
L1
UU9.8
C1
R1A,B
2A/250V
1000P/500V
22R//22R
L
1N4007*4
D3A~D
R3
NC
T1A
EE22
L2
CX1
0.1u
R3*15:0.7*15Ts
12V/1.5A
VOUT
R4
D4
10A/100V
R5
750K
R7
51K
NC
C2
R9
5.1K
33u/400V
C4
1000u/25V
2200P/1KV
C3
C5
100u/25V
N
R6
R8
5OHM/3A
NTC1
750K
51K
GND
D2
1N4007
1N4007
D1
10R
R2
T1B
C6
10u/50V
R10
27R
R11
470R
R13
10K
Q1
2A/600V
2
6
COMP
OUT
IC1A
EL817
IC2
GR8836
R15
10K
R12
10K
3
4
C8
0.1u
RT
CS
RS1
IC3
KA431AZ
RS2
2.4R//2.4R
100R
IC1B
EL817
R1
C7
0.01u
CS1
100P
100K
1KP
CY1
R14
2.63K
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Package Information
SOT-26
SYMBOL
MILLIMETERS
INCHES
MIN.
MAX.
1.45
0.15
1.30
0.50
0.22
3.10
3.00
1.80
MIN.
MAX.
0.057
0.006
0.051
0.020
0.009
0.122
0.118
0.071
A
A1
A2
b
0.00
0.90
0.30
0.08
2.70
2.60
1.40
0.000
0.035
0.012
0.003
0.106
0.102
0.055
c
D
E
E1
e
0.95 BSC
1.90 BSC
0.037 BSC
0.075 BSC
e1
L
0.30
0o
0.60
8 o
0.012
0o
0.024
8 o
Note : 1. Followed from JEDEC TO-178 AB.
2. Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusions or gate burrs
shall not exceed 10 mil per side.
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Package Information
DIP-8
SYMBOL
MILLIMETERS
INCHES
MIN.
MAX.
5.33
MIN.
MAX.
0.210
A
A1
A2
b
0.38
2.92
0.36
1.14
0.20
9.01
0.13
7.62
6.10
0.015
0.115
0.014
0.045
0.008
0.355
0.005
0.300
0.240
4.95
0.56
1.78
0.35
10.16
0.195
0.022
0.070
0.014
0.400
b2
c
D
D1
E
8.26
7.11
0.325
0.280
E1
e
2.54 BSC
7.62 BSC
0.100 BSC
0.300 BSC
eA
eB
L
10.92
3.81
0.430
0.150
2.92
0.115
Note : 1. Followed from JEDEC MS-001 BA
2. Dimension D, D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 10
mil.
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8836
Carrier Tape & Reel Dimensions
SOT-26
Application
SOT-26
A
H
T1
C
d
D
W
E1
F
8.4+2.00 13.0+0.50
178.0 2.00 50 MIN.
1.5 MIN. 20.2 MIN. 8.0 0.30 1.75 0.10 3.5 0.05
-0.00
-0.20
D0
P0
P1
P2
D1
T
A0
B0
K0
1.5+0.10
-0.00
0.6+0.00
-0.40
4.0 0.10
4.0 0.10 2.0 0.05
1.0 MIN.
3.20 0.20 3.10 0.20 1.50 0.20
(mm)
Application
SOT -26
Carrier Width
Cover Tape Width
Devices Per Reel
8
5.3
3000
________________________________________________________________________
Grenergy OPTO, Inc. reserves the right to make corrections, modifications, enhancements, improvements, and other changes
to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the
latest relevant information before placing orders and should verify that such information is current and complete.
2010.04 Ver. 1.21 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
13
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