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PDF XN1049 Data sheet ( Hoja de datos )
| Número de pieza | XN1049 | |
| Descripción | Switch Power Supply PWM Controller | |
| Fabricantes | Innuovo | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XN1049 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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XN1049 Switch Power Supply PWM Controller
XN1049 Switch Power Supply PWM Controller
General Description
XN1049 which is optimized for high performance is a
highly integrated current mode PWM control IC. It is
applied for switch power of the small-sized and
medium-sized for example the power adaptor. For
lower the standby power and higher RoHS compliant,
the IC has the Burst Mode function and very low
startup current and working current. At the condition
of no load or light load, the IC operates in extended
‘burst mode’ to minimize switching loss by lower the
switching frequency. The low startup current and low
operating current contribute to a reliable power on
startup design with XN1049. A large value resistor
could thus be used in the startup circuit to minimize
the power consumption and improve the efficiency of
the power convent.
The internal synchronous slope compensation circuit
improves system large signal stability and reduces the
possible subharmonic oscillation at high PWM duty
cycle output. Leading-edge blanking on current
sense(CS) input removes the signal glitch due to
snubber circuit diode reverse recovery and thus
greatly reduces the external component count and
system cost in the design. XN1049 offers complete
protection coverage with automatic self-recovery
feature including over current protection cycle by
cycle (OCP), over load protection (OLP), under
voltage lockout (UVLO). The gate-driven output is
clamped to maximum 18V to protect the external
MOSFET. Excellent EMI performance is achieved by
using the frequency jitter and the soft-switching at the
totem-pole-gate-drive output. The tone energy at
below 20KHZ is minimized in the design and audio
noise is eliminated during operation. The IC can be
used as the best alternative products of the linear
power supply or the RCC-mode power to improve the
whole performance of the switch power system and
lower the cost. XN1049 is offered in SOT23-6, SOP-8
and DIP-8 packages.
Features
Extended burst mode control for improving
efficiency and minimum standby power
Low startup current(4uA)
Low operation current(1.4mA)
Leading edge blanking was built in
Synchronous slope compensation was built in
Current mode operates
External programmable PWM switching
frequency
Over current protection cycle by cycle(OCP)
Good protection coverage with auto self-
recovery
VDD over voltage clamp and under voltage
lockout with hysteresis (UVLO)
Maximum gate-drive output clamped voltage
(18V)
Frequency jitter
Constant limited output power
Over load protection(OLP)
Free audio noise operation
◎Xi’an Innuovo Microelectronics Co., Ltd.
DS.XN1049V1.0
Page 1
June, 2008
Free Datasheet http://www.Datasheet4U.com
1 page  
ESD Information
XN1049 Switch Power Supply PWM Controller
Symbol
VESD-HBM
VESD-MM
Parameter
Value
Human body model on all pins except 3
Vin and VDD
Machine model on all pins
150
Electrical Characteristics
Unit
KV
V
Supply Voltage (VDD)
symbol
parameter
Test condition
VDD_OP
Operation voltage
UVLO_ON
Turn on threshold Voltage
UVLO_OFF Turn-off threshold Voltage
I_VDD_ST
Start up current
VDD=13V,RI=100K
I_VDD_OP
Operation Current
VDD=16V,RI=100K,VFB=3V,
GATE with 1nF to GND
VDD_Clamp VDD Zener Clamp Voltage
Feedback Input Section
IVDD=10mA
VFB_Open
IFB_Short
VTH_PL
TD_PL
ZFB_IN
Max_Duty
VFB Open Loop Voltage
FB Pin Short Current
Power limiting FB Threshold
Power limiting Debounce
Input Impedance
Maximum duty cycle
FB Shorted to GND
Current Sense Section
TLEB
Zsense
TD_OC
TTH_OC
Leading edge Blanking Time
Input impedance
OCP control delay
OCP threshold
GATE with 1nF to GND
FB＝3V
Oscillator Section
Fosc Frequency
Oscillation
@RI=100K,CS=0,FB=3V
Fosc_BM
Burst mode frequency
Oscillation
@RI=100K,CS=0,FB=1.1V
∆f_temp
Frequency variation versus TEMP = -20 to 85℃
◎Xi’an Innuovo Microelectronics Co., Ltd.
DS.XN1049V1.0
Page 5
Min Typ Max Unit
30 V
7.5 8.5 9.5 V
13.5 14.3 15.5 V
4 20 uA
1.4 2.4 mA
33 V
4.5 4.9 5.5 V
0.8 mA
3.65 V
47 ms
6 kΩ
75 %
330 ns
40 kΩ
120 ns
0.70 0.75 0.80 V
60 65 70 KHz
22 KHz
5%
June, 2008
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet XN1049.PDF ] | |
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