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PDF EM8636 Data sheet ( Hoja de datos )
| Número de pieza | EM8636 | |
| Descripción | PWM Controller | |
| Fabricantes | Excelliance MOS | |
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EM8636
Green mode PWM with External Over Temperature Protection
General Description
EM8636 is a high performance, low startup
current, low cost, current mode PWM controller
with green mode power saving. The EM8636
integrates functions of Soft Start(SS), Under Voltage
Lockout(UVLO), Leading Edge Blanking(LEB),
internal and external Over Temperature
Protection(OTP), internal slope compensation. The
EM8636 also features more protection like Over
Load Protection(OLP) and Over Voltage
Protection(OVP) to prevent circuit damage
occurred under abnormal conditions.
The EM8636 provides the users a superior
AC/DC flyback power application of high efficiency,
excellent EMI performance, low external
component counts and lower cost solution.
Ordering Information
Part Number
EM8636J
Package
SOT-23-6
Remark
Typical Application Circuit
Features
Ultra Low Start Up Current (6uA)
Current Mode Control
Soft Start Function
Built-in Slope Compensation
Internal Leading-edge Blanking
Over Voltage Protection (OVP) on VDD pin
Over Load Protection (OLP)
Cycle-by-cycle Current Limit
Feedback Open Protection
External Over Temperature Protection (OTP)
Internal Over Temperature Protection (OTP)
Constant Output Power Limit (Full AC Input
Range)
Internal Frequency Jittering for Excellent EMI
Performance
Gate Voltage Clamping
Applications
Open-Frame SMPS
General Adapter and Charger
LCD Monitor Power
AC
INPUT
EMI
Filter
+ DC
OUTPUT
LATCH
COMP
VDD
EM8636
GATE
CS
GND
2014/3/21
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1
1 page  
Electrical Characteristics
(VDD=15V, TA=25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
VDD Section
VDD OVP Protect voltage
Start up Current
VDD On Threshold Voltage
VOVP
ISTART1
ISTART2
VTH-ON
VDD=7V
VDD= VTH-ON -0.5V
VDD Off Threshold Voltage
VDD Reset Threshold Voltage
VTH-OFF
VRESET
Operating Supply Current 1
Operating Supply Current 2
Operating Supply Current 3
IDD-OP1
IDD-OP2
IDD-OP3
VDD=15V, VCOMP=0V,
VDD=15V, VCOMP=3V,
CGATE=1nF
VDD=15V,
Protection triggerred
Gate Section
Rising Time
Falling Time
TR CL = 1nF
TF CL = 1nF
Current-Sense Section
Maximum Internal Current
Setpoint
VCSLim
Leading Edge Blanking Time
Propagation Delay Time
Soft-Start Period
TLEB
TPD
TSS
Internal Oscillator
Oscillation Frequency
Maximum Duty
Green mode Minimum
Frequency
fOSC
Dmax
fOSC-G
VCOMP=3V, VCS=0V
Frequency Jittering
fjitter
Frequency Variation vs. VDD
Frequency Variation vs.
Temperature
fDV
fDT
VDD=11V to 25V
-20°C to 105°C (Note4)
EM8636
Min Typ Max Units
27 28 29 V
- 1 2 uA
- 6 15 uA
13.5 15 16.5 V
7.5 8.5 9.5 V
6V
- 1 2.5 mA
- 2.5 - mA
- 1 - mA
- 150 200 nS
- 30 100 nS
0.83 0.85 0.87 V
200 250 300 nS
100 nS
2 mS
60 65 70 KHz
70 75 80 %
25 KHz
±6 %
3%
3%
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5 Page 
Over Voltage Protection (OVP) on VDD
The EM8636 are implemented a
Over-Voltage-Protection (OVP) on VDD.
Whenever the VDD voltage is higher than the
OVP threshold voltage (28V), 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 VDD function in
EM8636 is an auto-restart type protection. If the
OVP condition is not released, the VDD will
tripped the OVP level again and re-shutdown
the gate output. The VDD is working as a hiccup
mode as shown in Fig. 16. On the other hand, if
the OVP condition is removed, the VDD level will
go back to normal level and the output will
automatically return to the normal operation.
VDD
OVP level
UVLO (on)
UVLO (off)
Gate out
t
EM8636
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. 17)
Vb ias
LATCH
3
100uA
1.1V
160uS LATCH
Debounce
Fig.17
No Switch out
Fig. 16
t
Internal Over-Temperature Protection (OTP)
Internal 160℃ comparator will provide over
temperature protection (OTP). OTP will
shutdown system, until VDD below UVLO(low).
The system will hiccup, if the internal
temperature always higher than 160℃.
External Over-Temperature Protection (OTP)
The LATCH pin is equipped with a latch
shutdown function. (Fig. 17) By decreasing the
LATCH pin voltage to 1.1V or lower, the IC
enters the latch mode. To reset latch mode,
remove the AC power line, thus decreasing the
VDD voltage to the Reset Threshold Voltage (6V)
2014/3/21
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11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet EM8636.PDF ] | |
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