GR8830 [GRENERGY]
Green-Mode PWM Controller below 100mW Standby Power;
| 型号： | GR8830 |
| 厂家： | 
Grenergy Opto, lnc. |
| 描述： | Green-Mode PWM Controller below 100mW Standby Power |
| 文件： | 总13页 (文件大小：936K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
GR8830
Green-Mode PWM Controller below 100mW Standby Power
Features
Description
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Current mode PWM control
The GR8830 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
Standby power below 100mW solution
Under voltage lockout (UVLO)
Non-audible-noise green-mode control
Programmable switching frequency
Internal leading-edge blanking
Internal slope compensation
of
the current sensing, internal slope
Internal soft start
compensation, cycle-by-cycle peak current
limiting, and soft start. OLP, OCP and OVP
provide protection performance for fault conditions.
For protecting the external power MOSFET from
being damaged by supply over voltage, the
GR8830 OUT pin voltage is clamped to about
13V.
Gate output voltage clamp
Jitter and soft driving for reducing EMI
Over-voltage protection (OVP) on VCC pin
Over-load protection (OLP)
Over-current protection (OCP) on CS pin
Over-temperature protection (OTP)
The GR8830 improves the performance and
reduces the cost of power supplies. It is with both
DIP-8 and SOT-26 package.
Applications
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Switching AC/DC power adaptor
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.
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
1
GR8830
Pin Configuration
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 to set 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, DIP-8 see Pin Configuration.
Absolute Maximum Ratings
Supply voltage VCC --------------------------------------------------------------------------------------------------------- 30V
COMP, RT, CS --------------------------------------------------------------------------------------------------------
OUT ------------------------------------------------------------------------------------------------------------ 0.3 ~ Vcc+0.3V
Junction temperature ---------------------------------------------------------------------------------------------------- 150
0.3 ~ 7V
Operating ambient temperature -----------------------------------------------------------------------------
Storage temperature range -------------------------------------------------------------------------------
20 ~ 85
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) --------------------------------------------------
ESD voltage protection, human body model -------------------------------------------------------------------------
ESD voltage protection, machine model ----------------------------------------------------------------------------
260
2KV
200V
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
Recommended Operating Conditions
Item
Min.
12
Max.
25
Unit
V
Supply voltage VCC
Switching frequency
50
130
KHz
Block Diagram
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
Electrical Characteristics (VCC = 15.0V and T
A
= +25
unless otherwise specified)
Parameter
Pin
Min.
Typ.
Max.
Unit
SUPPLY VOLTAGE
Startup current
5
5
5
8
15
uA
mA
mA
Operating current (with 1nF load on OUT pin), Vcomp = 0V
1.5
2.5
Operating current (with 1nF load on OUT pin), Vcomp = 2.5V
Operating current (with 1nF load on OUT pin), protection tripped
5
0.65
mA
(OLP, OVP)
UVLO (off)
5
5
5
6.8
10.8
27
V
V
V
UVLO (on)
OVP level on VCC pin
26
28
5
VOLTAGE FEEDBACK
Open loop voltage, COMP pin open
2
2
V
V
Green-mode threshold voltage
1.8
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
20
65
6
70
KHz
%
Green mode frequency (RT = 100K
Temp. stability 40°C ~ 110°C)
)
25
3
KHz
%
Voltage stability (Vcc = 11V ~ 25V)
1
%
GATE DRIVER OUTPUT
Output low level, VCC = 15V, Io = 10mA
Output high level, VCC = 15V, Io = 10mA
Rising time, load capacitance = 1000pF
Falling time, load capacitance = 1000pF
VGATE-clamp (at VCC = 20V )
6
6
6
6
6
1
V
V
8
200
80
nS
nS
V
12
13
14
OLP
OLP trip level, Vcomp (OLP)
-
-
3.5
60
V
OLP delay time (note), Fs = 65KHz
mS
PWM Section
Maximum duty cycle
-
70
75
80
%
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
4
GR8830
Typical Performance Characteristics
20.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
Application Information
Start-up Current
Where R is the resistor connected at RT pin.
100Kohm resistor results in 65KHz switching
frequency. The recommended range of oscillation
A
The typical start-up current is around 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.
frequency is 50 KHz~130 KHz
.
Green-Mode Operation
Under-voltage Lockout (UVLO)
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 21 KHz, which is
A hysteresis UVLO comparator is implemented in
GR8830, once the VCC rises above UVLO (on)
voltage, the controller starts to switch with a soft
start period. It will continue to operate unless the
voltage drops below UVLO (off) voltage. It’s
operation is shown in Fig. 7
outside the audio range
.
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
Fig. 7
A built-in slope compensation circuit is constructed
in GR8830. 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
Soft Start
During initial power on, the GR8830 provides soft
start function. It effectively suppresses the start up
peak current to reduce the power MOSFET drain
voltage especially at high line.
sub-harmonic oscillations
.
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)
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
Application Information (Cont.)
Over-load Protection (OLP)
VCC
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. 8 shows the
waveform of the OLP operation.
OVP Tripped
OVP Level
UVLO(on)
UVLO(off)
t
OUT
Non-Switching
Switching
Switching
t
VCC
Fig. 9
Gate Clamp/Soft Driving
UVLO(on)
(off)
UVLO
OLP
(off )
OLP Counter Reset
Driver is clamped to 13V by an internal clamping
circuit. Those damages usually come from
undesired over-voltage gate signals. Under the
conditions listed below, the gate output will turn off
immediately to protect the power circuit. The
GR8830 also has soft driving function to minimize
EMI.
t
t
t
COMP
OLP delay time
3.5 V
OLP trip Level
OUT
Switching
Non - Switching
Switching
VCC Mode Operation
In order to avoid the output voltage shut down by
load changing from full to no load, the GR8830 is
built-in the VCC mode function. When the load from
full changes to no load, the output voltage will
overshoot and pull low the COMP pin by feedback
loop. Thus the duty will disappear and no power
delivers to the secondary. If there is without any
mechanism to prevent this situation, the VCC pin
voltage will down to UVLO off and the IC will re-start
again. In the GR8830, before the VCC is down to
UVLO off, it will force the OUT pin outputs the
specified duty to pull the VCC higher than UVLO off.
The operation is shown in Fig.10.
Fig. 8
Over-voltage Protection (OVP) on VCC
To prevent power MOSFET from being damaged,
the GR8830 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 GR8830 is working in a hiccup mode
as shown in Fig. 9.
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
Application Information (Cont.)
The VCC mode function is used to prevent the
output re-start again when load changes. So never
let the system operate on the VCC mode at no load.
The system should operate on burst mode,
otherwise the input power maybe become larger.
VCC
VCC mode
Burst mode
VCC mode(off)
VCC mode(on)
UVLO(off)
t
t
t
LOAD
Full load
OUT
Switching
Fig. 10
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
8
GR8830
Typical Application Circuit
C C V
D N G
5
1
t
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
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.
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
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.
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
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GR8830
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
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
12
GR8830
Taping direction information
SOT-26
Direction of feed
Direction of feed
AAA
AAA AAA
AAA AAA AAA AAA
_______________________________________________________________________
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.
2010.10 Ver. 1.1 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
13
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