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PDF EM8671A Data sheet ( Hoja de datos )
| Número de pieza | EM8671A | |
| Descripción | PWM Controller | |
| Fabricantes | Excelliance MOS | |
| Logotipo |  |
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EM8671/A
HV Start-up Green-mode PWM Controller with Brown-Out Protection
General Description
EM8671/A is a high performance, low cost, HV
Start-up, current mode PWM controller with green
mode power saving. The EM8671/A integrates
functions of Soft Start(SS), Under Voltage
Lockout(UVLO), Leading Edge Blanking(LEB),
internal Over Temperature Protection(OTP),
internal slope compensation. The EM8671/A also
features more protection like Over Load
Protection(OLP) and Over Voltage Protection(OVP)
to prevent circuit damage occurred under
abnormal conditions. The EM8671/A also has line
under-voltage protection (Brown-out Protection).
Ordering Information
Part Number
EM8671G
EM8671G7
EM8671AG
EM8671AG7
Package
SOP-8
SOP-7
SOP-8
SOP-7
Deep burst CS level
0.3V
0.3V
0.1V
0.1V
Typical Application Circuit
Features
700V High Voltage Start up Circuit
Current Mode Control
Soft Start Function
Built-in Slope Compensation
Internal Leading-edge Blanking
Brown in/out Protection
Over Voltage Protection (OVP) on VCC pin
Over Load Protection (OLP)
Cycle-by-cycle Current Limit
Feedback Open Protection
Internal Over Temperature Protection (OTP)
Constant Output Power Limit (Full AC Input
Range)
Excellent EMI performance
Applications
LCD Monitor Power Supply
Open-Frame SMPS
2013/01/30
REV.A.3
1
1 page  
Electrical Characteristics
(VCC=16V, TA=25℃, unless otherwise specified)
Parameter
Symbol Test Conditions
VCC Section
VCC OVP Protect voltage
Start up current
VCC On Threshold Voltage
VCC Off Threshold Voltage
Operating Supply Current 1
Operating Supply Current 2
VOVP
ISTART
VTH-ON
VTH-OFF
ICC-OP1
ICC-OP2
VCC=VTH-ON-0.5V
VCC=15V, VCOMP=0V,
VCC=15V, VCOMP=3V,
CGATE=1nF
Operating Supply Current 3
ICC-OP3
VCC=15V,
Protection triggerred
Gate Section
Rising Time
Falling Time
HV Section
TR CL = 1nF
TF CL = 1nF
HV Current Source
IHV
VCC=VTH-ON-0.5V
VHV=50V
Off-State Leakage
Ileakage
Current-Sense Section
Maximum Internal Current
Setpoint
VCSLim
Leading Edge Blanking Time
Propagation Delay Time
Soft-Start Period
Internal Oscillator
TLEB
TPD
TSS
Oscillation Frequency
fOSC
Maximum Duty
Dmax
Green mode minimum frequency
Frequency variation vs. VCC
Frequency variation vs.
Temperature
VCC=VTH-ON+0.5V
VHV=700V
VBNO=1V
VBNO=3V
VCC=11V to 25V
-20℃ to 105℃
(Note4)
COMP Section
COMP short to GND current
Open loop COMP voltage
COMP voltage to CS voltage
Attenuation
ICOMP
VCOMP
Av
VCOMP=0V
COMP pin open
Min
25
-
15
9
-
-
-
-
-
0.8
0.65
200
60
150
1 / 2.5
EM8671/A
Typ Max Units
27 29 V
45 65 uA
16 17 V
10 11 V
1 2 mA
2.5 - mA
0.5 - mA
100 160 nS
30 60 nS
1 mA
1 20 uA
0.85 0.9 V
0.7 0.75 V
300 400 nS
100 nS
2.5 mS
65 70 KHz
75 %
22 KHz
5%
5%
250 350 uA
5.2 V
1 / 3 1 / 3.5 V/V
2013/01/30
REV.A.3
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5 Page 
Over-load / Open-loop Protection (OLP)
When feedback loop is open, as shown in Fig. 17,
no current flows through the opto-coupler
transistor, the EM8671/A pulls up the COMP pin
voltage to 5.2V.
When the COMP pin voltage is above 4.0V
longer than 56mS, OLP is triggered. This
protection is also triggered when the SMPS
output drops below the normal value longer
than 56mS due to the overload condition.
VCC
OVP level
UVLO(on)
UVLO(off)
Gate out
EM8671/A
No Switch out
Fig. 18
t
t
Fig. 17
Over Voltage Protection (OVP) on VCC
The VGS ratings of the HV power MOSFETs are
often limited up to max 30V. To prevent the VGS
from the fault condition, the EM8671/A are
implemented a Over-Voltage-Protection (OVP)
on VCC. Whenever the VCC voltage is high than
the OVP threshold voltage (28V), the output
gate drive will be shutdown to shop the
switching of the power MOSFET until the next
UVLO (on).
The Over-Voltage-Protection on VCC function in
EM8671/A is an auto-restart type protection. If
the OVP condition is not released, the VCC will
tripped the OVP level again and re-shutdown
the gate output. The VCC is working as a hiccup
mode as shown in Fig. 18. On the other hand, if
the OVP condition is removed, the VCC level will
go back to normal level and the output will
automatically return to the normal operation.
Internal Over-Temperature Protection (OTP)
Internal 140℃comparator will provide over
temperature protection (OTP). OTP will not
shutdown system. It stops the system from
switching until the VCC is below the UVLO (off)
threshold voltage, the system will hiccup.
2013/01/30
REV.A.3
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EM8671A.PDF ] | |
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