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PDF XC9247 Data sheet ( Hoja de datos )
| Número de pieza | XC9247 | |
| Descripción | 16V Driver Transistor Built-In Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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XC9246/XC9247 Series
ETR05024-005a
16V Driver Transistor Built-In Step-Down DC/DC Converters
■GENERAL DESCRIPTION
☆GreenOperation-compatible
XC9246/XC9247 series is a 16V step-down DC/DC converter with a built-in driver transistor. The series provides high
efficiency, and a stable power supply with output currents up to 1A. The series is designed for use with small ceramic capacitors.
The series has a 1.0V reference voltage, and using externally connected resistors, the output voltage can be set freely. With an
internal switching frequency of 1.2MHz, small external components can be used. The soft-start time is internally set to 1.5ms (TYP.),
but can be adjusted to set a longer time using an external resistor and capacitor.
As for operation mode, the XC9246 series is PWM control and the XC9247 series is automatic PWM/PFM switching control.
In PWM/PFM switching control mode, provides fast response, low ripple and high efficiency over the full range of loads (from light
load to heavy load).
With the UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes
lower than detect voltage. The series includes current limit, thermal shutdown, and short-circuit protection.
Two types of package SOT-26W and USP-6C are available.
■APPLICATIONS
●LCD-TVs
●BD/HDD recorders
●Set top box
●Home video game consoles
●Multifunction printers
■FEATURES
Input Voltage
Output Voltage Range
Output Current
Efficiency
Oscillation Frequency
Maximum Duty Cycle
Soft-start Time
Control Methods
Protection Circuits
UVLO
Output Capacitor
Operating Ambient Temperature
Packages
Environmentally Friendly
: 4.5V～16V
(The VIN range depends on the product)
: 1.2V～5.6V (VFB=1.0V)
(The VOUT range depends on the product)
: 1A (VIN≧6V and VOUT/VIN≦50%)
1A (VIN＜6V and VOUT/VIN≦40%)
: 90%(VIN=12V, VOUT=5V, IOUT=200mA)
: 1.2MHz
: 80%
: Internally fixed 1.5ms
Adjustable by RC
: PWM Control (XC9246)
PWM/PFM Automatic switching control (XC9247)
: Current limiter (Integral Latching)
Thermal shutdown
Short-circuit protection
: 4.15V, 5.65V, 7.65V
: Ceramic Capacitor Compatible
: -40℃～+85℃
: USP-6C, SOT-26W
: EU RoHS Compliant, Pb Free
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
CHARACTERISTICS
100
90
80
70
60
50
40
30
20
10
0
1
XC9246B75/XC9247B75 (VOUT=5.0V)
L=6.8μH(VLP4045LT-6R8M), SBD=XBS204S17R
CIN=10μF(TMK316BJ106KL), CL=10μF×2(LMK212ABJ106KG)
XC9246@VIN=12V
XC9247@VIN=12V
10 100
Output Current :IOUT(mA)
1000
1/31
1 page  
XC9246/XC9247
Series
■ELECTRICAL CHARACTERISTICS
XC9246/XC9247 Series
Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNITS CIRCUIT
FB Voltage
VFB
VIN=12V, VEN/SS=5V, VFB=0.9V→1.1V
Voltage to start oscillation while
D1 (*1)
Operating Voltage Range
Maximum Output Current
UVLO Detection Voltage
VIN
IOUTMAX
VUVLOD
-
-
VEN/SS=5V, VFB=0.9V
Voltage which Lx pin holding ”L” level (*6)
1000
D2 (*1)
-
D3 (*1)
UVLO Release Voltage
VUVLOR
VEN/SS=5V, VFB=0.9V
Voltage to start oscillation while
D4 (*1)
UVLO Hysteresis Voltage
Supply Current
Stand-by Current
Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
PFM Switch Current (*2)
VUVLOHYS
Iq
ISTB
fOSC
DMAX
DMIN
IPFM
-
VIN=12V, VEN/SS=5V, VFB=1.1V
VIN=16V, VEN/SS=0V
VIN=12V, VEN/SS=5V, VFB=0.9V
VIN=12V, VEN/SS=5V, VFB=0.9V
VIN=12V, VEN/SS=5V, VFB=1.1V
VIN=12V, VEN/SS=5V, VOUT=3.3V, IOUT=10mA
When connected to external components
-
-
1020
72
-
-
D5 (*1)
150
6
1200
80
-
300
PFM Duty Limit (*2)
Lx SW ON Resistance
Current Limit (*5)
Integral Latch Time
Short Detect Voltage
DTYLIMIT_PFM
RLx
ILIM
tLAT
VSHORT
-
VIN=12V, VEN/SS=5V, VFB=0.9V
VIN=12V, VEN/SS=5V, VFB=0.9V
VIN=12V, VEN/SS=5V, VFB=0.9V
Sweeping VFB, VIN=12V, VEN/SS=5V,
Short VOUT at1ΩResistance, VFB voltage which
Lx becomes “L” level within 300μs
-
-
1600
0.75
0.3
200
0.35 (*4)
2500
1.5
0.5
Internal Soft-start Time
tSS1 VIN=12V, VEN/SS=0V→5V,VFB=0.9V
VIN=12V, VEN/SS=0V→5V, VFB=0.9V
External Soft-start Time tSS2 RSS=120KΩ, CSS=0.47μF
When connected to external components
0.75 1.5
18 26
Efficiency
EFFI
Target Output Voltage=5.0V
VIN=12V, IOUT=200mA (*3)
- 90
Output Voltage
Temperature Characteristics
∆VOUT/
(VOUT・∆Topr）
IOUT=100mA
-40℃≦Topr≦85℃
- ±100
Thermal Shutdown
Temperature
TTSD
-
- 150
Hysteresis Width
THYS
-
- 20
EN/SS "H" Voltage
VEN/SSH
VIN=12V, VFB=VFB(E)-10mV (*7),
VEN/SS=5V→1V, Voltage to stop oscillation while
-
2.0
EN/SS "L" Voltage
VEN/SSL
VIN=12V, VFB=0V
VEN/SS=5V→0V, Voltage to stop oscillation while
0.4
-
EN/SS "H" Current
IEN/SSH
VIN=VEN/SS=16V
-7
EN/SS "L" Current
IEN/SSL
VIN=12V, VEN/SS=0V
-0.1 -
FB "H" Current
IFBH VIN=12V, VEN/SS=0V, VFB=5.5V
-0.1 -
FB "L" Current
IFBL VIN=12V, VEN/SS=0V, VFB=0V
-0.1 -
Lx "L" Current
ILXL VIN=16V, VEN/SS=5V, VFB=1.1V, VLX=0V
-7.5 -4
Unless otherwise stated, VIN=12V, VEN/SS=5V
(*1) Please refer to SPEC Table below.
(*2) As the XC9246 series work in the PWM control operation only, IPFM and DTYLIMIT_PFM are not for XC9246 series.
(*3) EFFI=[(output voltage x output current)÷(input voltage x input current)]×100
(*4) Design value
(*5) Current limit denotes the level of detection at peak of coil current.
(*6) "H"=VIN～VIN-1.2V , "L"=+0.1V～-0.1V
(*7) VFB(E) is effective value of FB voltage.
-
300
15
1380
88
0
-
-
0.5 (*4)
-
3
0.7
3
35
-
-
-
-
2.5
-
15
0.1
0.1
0.1
-
V
V
mA
V
V
V
μA
μA
kHz
%
%
mA
%
Ω
mA
ms
V
ms
ms
%
ppm/℃
℃
℃
V
V
μA
μA
μA
μA
μA
②
①
①
②
②
-
③
③
②
②
②
①
①
-
②
②
④
②
⑤
①
①
-
-
②
②
⑥
⑥
⑥
⑥
⑦
5/31
5 Page 
■TYPICAL APPLICATION CIRCUIT (Continued)
XC9246/XC9247
Series
<CBST Setting>
0.22μF is recommended for the CBST capacitance when CL=22μF. Do not fix it at CBST=0.22μF for all conditions but rather
change it depending on the CL capacitance .(*1)
As a guideline, make it about CL:CBST=100:1.
(*1) Think of the CL capacitance as the total capacitance connected to the VOUT of XC9246/XC9247.
【CBST Optimum Settings】
CL(μF)
CBST(μF)
CL≦22
22＜CL≦47
0.22
0.47
47＜CL≦100
100＜CL≦220
1
2.2
<Soft-start Time Setting>
The Vref voltage applied to the error amplifier is restricted by the start-up voltage of the EN/SS pin. This ensures that the error
amplifier operates with its two inputs in balance, thereby preventing ON-time signal from becoming longer than necessary.
Therefore, start-up time of the EN/ESS pin becomes the set-time of soft-start. The soft-start time can be adjusted by adding a
capacitor and a resistor to the EN/SS pin. If the EN/SS pin voltage rises steeply without connecting CSS and RSS (RSS=0Ω),
Output rises with taking the soft-start time of 1.5ms (TYP.) which is fixed internally. The soft-start function operates when the
voltage at the EN/SS pin is between 0.4V to 2.5V. If the voltage at the EN/SS pin does not start from 0V but from a mid level
voltage when the power is switched on, the soft-start function will become ineffective and the possibilities of large inrush currents
and ripple voltages occurring will be increased. Soft-start time is approximated by the equation below according to values of VEN, RSS,
and CSS.
tss=- Css × Rss × In { (VEN/SS– 2) / VEN/SS }
Example: When Css=0.47μF, Rss=120kΩ and VEN/SS=5V, tSS=-0.47x10-6 x 120x103 x In((5-2)/5)=29ms (Approx.)
* When RSS=0Ω and CSS=0F, the soft-start time is 1.5ms (TYP.) and it’s set internally.
11/31
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9247.PDF ] | |
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