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PDF EM8672 Data sheet ( Hoja de datos )
| Número de pieza | EM8672 | |
| Descripción | PWM Controller | |
| Fabricantes | Excelliance MOS | |
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EM8672
HV Start-up PWM Controller with Over Temperature Protection
General Description
EM8672 is a high performance, low cost, HV
Start-up, current mode PWM controller with green
mode power saving. The EM8672 integrates
functions of Soft Start(SS), Under Voltage
Lockout(UVLO), Leading Edge Blanking(LEB),
internal Over Temperature Protection(OTP),
internal slope compensation. The EM8672 also
features more protection like Over Load
Protection(OLP) and Over Voltage Protection(OVP)
to prevent circuit damage occurred under
abnormal conditions. The EM8672 also has external
Over Temperature Protection(Latch).
Features
700V High Voltage Start up Circuit
Current Mode Control
Soft Start Function
Built-in Slope Compensation
Internal Leading-edge Blanking
External Over Temperature 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
Ordering Information
Part Number
EM8672G
EM8672G7
Package
SOP-8
SOP-7
Remark
Typical Application Circuit
AC EMI
INPUT Filter
Applications
LCD Monitor Power Supply
Open-Frame SMPS
+ DC
OUTPUT
HV VCC
LATCH
GATE
EM8672
COMP
CS
GD
2013/01/30
REV.A.4
1
1 page  
EM8672
Electrical Characteristics
(VCC=15V, TA=25℃, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Units
VCC Section
VCC OVP Protect voltage
Start up current
VCC On Threshold Voltage
VCC Off Threshold Voltage
VCC Reset Threshold Voltage
Operating Supply Current 1
Operating Supply Current 2
Operating Supply Current 3
Gate Section
Rising Time
Falling Time
HV Section
VOVP
ISTART
VTH-ON
VTH-OFF
VRESET
ICC-OP1
ICC-OP2
ICC-OP3
VCC=VTH-ON-0.5V
VCC=15V, VCOMP=0V,
VCC=15V, VCOMP=3V,
CGATE=1nF
VCC=15V,
Protection triggerred
TR CL = 1nF
TF CL = 1nF
25 27 29 V
- 45 65 uA
15 16 17 V
9 10 11 V
8.8 V
- 1 2 mA
- 2.5 - mA
- 0.5 - mA
- 100 160 nS
- 30 60 nS
HV Current Source
IHV
VCC=VTH-ON-0.5V
VHV=50V
1 mA
Off-State Leakage
Ileakage
VCC=VTH-ON+0.5V
VHV=700V
1 20 uA
Current-Sense Section
Maximum Internal Current
Setpoint
Leading Edge Blanking Time
Propagation Delay Time
Soft-Start Period
Internal Oscillator
VCSLim
TLEB
TPD
TSS
0.8 0.85 0.9 V
200 300 400 nS
100 nS
2.5 mS
Oscillation Frequency
fOSC
Maximum Duty
Dmax
Green mode minimum frequency
60 65 70 KHz
75 %
22 KHz
Frequency variation vs. VCC
Frequency variation vs.
Temperature
VCC=11V to 25V
-20℃ to 105℃(Note4)
5%
5%
COMP Section
COMP short to GND current
Open loop COMP voltage
ICOMP
VCOMP
VCOMP=0V
COMP pin open
150 250 350 uA
5.2 V
2013/01/30
REV.A.4
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5 Page 
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 EM8672 are
implemented an Over-Voltage-Protection (OVP)
on VCC. Whenever the VCC voltage is higher
than the OVP threshold voltage (27V), 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
EM8672 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. 17. 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.
VCC
OVP level
UVLO(on)
UVLO(off)
Gate out
t
No Switch out
Fig. 17
t
EM8672
5.2V
LATCH
1
100uA
1.05V
160uS LATCH
Debounce
Fig. 18
External Over-Temperature Protection (OTP)
The LATCH pin is equipped with a latch
shutdown function. (Fig. 18) By decreasing the
LATCH pin voltage to 1.05V or lower, the IC
enters the latch mode. To reset latch mode,
interrupt the input voltage, thus decreasing the
VCC voltage to the Reset Threshold Voltage or
lower. If the external latch shutdown function by
the LATCH pin is not to be used, let this pin
floating or connecting a capacitor only.
Connect an NTC resistor to the LATCH pin to use
the over-temperature protection. (Fig. 18)
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.4
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EM8672.PDF ] | |
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