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PDF EM8562 Data sheet ( Hoja de datos )
| Número de pieza | EM8562 | |
| Descripción | PWM Converter | |
| Fabricantes | Excelliance MOS | |
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EM8562
HV Start-up Green-mode PWM Converter with Brown-Out Protection
General Description
EM8562 is a high performance, low cost, HV
Start-up, current mode PWM converter with green
mode power saving. The EM8562 integrates
functions of Soft Start (SS), Under Voltage Lockout
(UVLO), Leading Edge Blanking (LEB), internal Over
Temperature Protection (OTP), and internal slope
compensation. The EM8562 also features more
protection like Over Load Protection (OLP) and
Over Voltage Protection (OVP) to prevent circuit
damage occurred under abnormal conditions. The
EM8562 also has line under-voltage protection
(Brown-out Protection).
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
Ordering Information
Part Number
EM8562S7
Package
DIP-7
Remark
Typical Application Circuit
Applications
LCD Monitor Power Supply
Open-Frame SMPS
AC EMI
INPUT Filter
DC
OUTPUT
DD
VCC
EM8562
CS BNO GND COMP
2013/02/04
Rev.A.5
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
VOVP
ISTART
VTH-ON
VTH-OFF
ICC-OP1
VCC=VTH-ON-0.5V
VCC=15V, VCOMP=0V,
EM8562
Min Typ Max Units
27 29 31 V
- 45 65 uA
15 16 17 V
9 10 11 V
- 0.7 2 mA
Operating Supply Current 2
ICC-OP2 VCC=15V, VCOMP=3V,
- 2.5 - mA
Operating Supply Current 3
ICC-OP3
VCC=15V,
Protection triggerred
- 0.3 - mA
D Section
HV Current Source
Drain to Source Breakdown voltage
Drain leakage current
ON-Resistance
VCC=VTH-ON-0.5V
VD=50V
VCC=VTH-ON+0.5V
VD=700V, PWM off
1 mA
700 V
300 uA
3Ω
Switching time
Current-Sense Section
TF
250 nS
Maximum Internal Current
Setpoint
VCSLim
OCP at 36% Duty
OCP at Zero on-Duty
0.81 0.9 0.99 V
0.70 0.78 0.86 V
Leading Edge Blanking Time
Propagation Delay Time
Soft-Start Period
Internal Oscillator
TLEB
TPD
TSS
300 400 500 nS
100 nS
3.5 mS
Oscillation Frequency
Jitter Percentage
fOSC
90 100 110 KHz
+/-4 %
Jitter Period
2.6 mS
Maximum Duty
Dmax
Green mode minimum frequency
75 %
22 KHz
Frequency variation vs. VCC
Frequency variation vs.
Temperature
VCC=11V to 25V
-20℃ to 105℃(Note4)
3%
3%
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
2013/02/04
Rev.A.5
5
5 Page 
VCC
COMP
1.5V
1.4V
1.3V
Vcs
0.3V
Deep Burst
Burst
Fig. 17
time
Protection
The EM8562 provides many protection functions
that intend to protect system from being damaged.
All the protection functions are listed as below:
Over-Load / Open-Loop Protection (OLP)
When feedback loop is open, as shown in Fig. 18,
no current flows through the opto-coupler
transistor, the EM8562 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.
EM8562
Cycle-by-Cycle Current Limit
The EM8562 has over-current protection
thresholds. It is for cycle-by-cycle current limit,
which turns off MOSFET for the remainder of
the switching cycle when the sensing voltage of
MOSFET current reaches the threshold.
Over Voltage Protection (OVP) on VCC
The EM8562 are implemented an
Over-Voltage-Protection (OVP) on VCC.
Whenever the VCC voltage is high than the OVP
threshold voltage (29V), the output gate drive
will be shutdown to stop the switching of the
power MOSFET until the next UVLO (on).
The Over-Voltage-Protection on VCC function in
EM8562 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. 19. 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
Fig. 18
No Switch out
Fig. 19
t
Internal Over-Temperature Protection (OTP)
Internal 150℃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.
2013/02/04
Rev.A.5
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet EM8562.PDF ] | |
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