XC9119D10A Series
1MHz, PWM Controlled,
Step-Up DC/DC Converter, Ceramic Capacitor Compatible
ETR0408_008
■GENERAL DESCRIPTION
The XC9119D10A ries is 1MHz, PWM controlled step-up DC/DC converter, designed to allow the u of ceramic capacitors. With a built-in 2.0Ω switching transistor, the XC9119D10A ries can easily provide a step-up operation by using only a coil, a diode, a capacitor, and a resistor, connected externally.
Since output voltage up to 19.5V (Maximum Lx operating voltage: 20V) can be derived with reference voltage supply of 1.0V (±2.0%) and external components, the ries can easily supply high voltage for various general-purpo power supplies, LCD panels and organic EL displays. With a high switching frequency of 1.0MHz, a low profile and small board area solution can be achieved using a chip coil and
an ultra small ceramic output capacitor.
With the current limit function (400mA (TYP .): V DD =3.6V), a peak current, which flows through built-in driver transistors can be limited. Soft-start time can be adjusted by external resistors and capacitors. The stand-by function enables the output to be turned off (CE ’L’), that is, the supply current will be less than 1.0⎧A.
■TYPICAL APPLICATION CIRCUIT
■APPLICATIONS
●Organic electroluminescence display (OELD)●Power supplies for LCDs ●Multi-function power supplies
■FEATURES
Operating Voltage Range : 2.5V ~ 6.0V Output Voltage Range : Up to 19.5V externally t-up
: Reference voltage 1.0V +2.0%
Oscillation Freq uency : 1.0MHz ±20%
ON Resistance : 2.0Ω (V DD =3.6V, V DS=0.4V) Efficiency : 86%
(V OUT =15V, V DD =3.6V, I OUT =10mA)
Control : PWM control Stand-by function : I STB =1.0⎧A (MAX.)
Load Capacitor : Low ESR ceramic capacitor
Ultra Small Packages : SOT-25, USP-6C Lx Limit Current : 400mA (V DD =3.6V)
■TYPICAL PERFORMANCE CHARACTERISTICS
○Efficiency vs. Output Current
1020304050607080901000.1
1
101001000
Output Current: I OUT (mA)
E f f i c i e n c y : E
F F I (%)
XC9119D10A
1/18
2/18
■PIN CONFIGURATION
SOT-25
*The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and metal masking so as to enhance mounting strength and heat resistance. If the pad needs to be connected to other pins, it
should be connected to the V SS
pin. USP-6C
(BOTTOM VIEW)
(TOP VIEW)
PIN NUMBER SOT-25 USP-6C
PIN NAME
FUNCTION
1 2 Lx Switch
2 3 V SS Ground 3 1 FB Voltage Feedback 4 6
CE/SS Chip Enable/ Soft Start
5 4 V DD Power Input - 5
NC No Connection
■PIN ASSIGNMENT
■CE PIN FUNCTION
CE/SS PIN
OPERATIONAL STATE
H Operation
L Shut-down ■PRODUCT CLASSIFICATION
●Ordering Information
XC9119D ①②③④⑤-⑥
(*1)
郝彬DESIGNATOR DESCRIPTION SYMBOL
DESCRIPTION
①② Reference Voltage 10 FB voltage ③
Oscillation Frequency
A
1MHz
MR SOT-25
MR-G SOT-25 (Halogen & Antimony free)
ER USP-6C ④⑤-⑥
Packages Taping Type
(*2)
ER-G
USP-6C (Halogen & Antimony free)
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully EU RoHS compliant. (*2)
The device orientation is fixed in its embosd tape pocket. For rever orientation, plea contact your local Torex sales office or reprentative. (Standard orientation: ④R-⑥, Rever orientation: ④L-⑥)
XC9119D10A
Series ■BLOCK DIAGRAM
VDD
L X FB
口笛是什么意思VSS
■ABSOLUTE MAXIMUM RATINGS
Ta = 25O C
PARAMETER SYMBOL RATINGS UNITS
turnout
V DD Pin Voltage V DD V SS – 0.3 ~ 7.0 V
Lx Pin Voltage V Lx V SS – 0.3 ~ 22.0 V
FB Pin Voltage V FB V SS – 0.3 ~ 7.0 V
CE Pin Voltage V CE V SS – 0.3 ~ 7.0 V
新概念第一册视频
Lx Pin Current I Lx 1000 mA
SOT-25 250 Power Dissipation Pd mW
USP-6C 120
Operating Temperature Range Topr - 40 ~ + 85 O C
Storage Temperature Range Tstg - 55 ~ +125 O C
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■ELECTRICAL CHARACTERISTICS
XC9119D10AMR
jstm
4/18
PARAMETER SYMBOL
CONDITIONS中美三个联合公报
MIN.
TYP .
MAX.
UNIT
CIRCUI
T
Ta = 25O C
FB Voltage V FB - 0.980 1.000 1.020 V ① △V FB/
Line Regulation 2.5<△V IN ・V FB
V DD <6.0V - 0.05 0.20 %/V ①
Supply Voltage V DD - 2.5 - 6.0 V ① Operation Start-up
Voltage
V ST1 I OUT =0mA - - 2.5 V ② Supply Current 1 I DD1 - 450 700 μA ② FB=2.0V
convergence
Supply Current 2 I DD2 - 55 110 μA ②
Stand-by Current I STB V CE =0V - - 1.0 μA ③ Oscillation Frequency f Same as I DD1 0.8 1.0 1.2 MHz ② OSC
Maximum Duty Ratio
MAXDTY
Same as I DD1 86 92 98 % ② Efficiency (*1) EFFI
V IN =V DD =3.6V, V OUT =15V,
I OUT =10mA
- 86 - % ① Current Limit I LIM V DD =3.6V 310 400 750 mA ④ Lx Operating Voltage
Range
V Lx V OUT =18V - - 20.0 V ①
Lx Switch On Resistance R SWON V DD =3.6V, V Lx =0.4V, Rpull=10Ω- 2.0 4.0 Ω ②
Lx Leak Current I LxL Same as I STB - - 1 μA ③
Applied voltage to CE when Lx pin
voltage holding “H””L” level CE “High” Voltage V CEH 0.65 - - V ②
Applied voltage to CE when Lx pin
voltage holding “H” level
CE “Low” Voltage V CEL - - 0.20 V ②
初中英语不好怎么办Soft-Start FB=0.95V , Applied voltage to CE
V SST 1.3 1.6 1.9 V ②
when Lx voltage holding “H””L” level Threshold Voltage
CE “High” Current I CEH Same as I DD2 -0.1 - 0.1 μA ③ CE “Low” Current I CEL Same as I STB -0.1 - 0.1 μA ③ FB “High” Current I FBH Same as I DD2 -0.1 - 0.1 μA ③ FB “Low” Current I FBL Same as I STB -0.1 - 0.1 μA ③
Test Condition: Unless otherwi stated, V IN =3.0V, V CE =3.0V, Vpull=5.0V, Rpull=100Ω.
NOTE:
*1: EFFI={(output voltage x output current) / (input voltage) x (input current)} x 100 ■TYPICAL APPLICATION CIRCUIT
V IN VOUT
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XC9119D10A
Series
■OPERATIONAL EXPLANATION
The XC9119D10A ries consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, pha
compensation circuit, driver transistor, current limiter circuit and others. The ries ICs compare, using the error amplifier, the voltage of the internal reference voltage source with the feedback voltage from the FB pin. Pha compensation is performed
on the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during switching. The PWM comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to the buffer drive circuit to cau the Lx pin to output a switching duty cycle. This process is continuously performed to ensure stable output voltage. The current feedback circuit detects the N-channel MOS driver transistor's current for each switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is ud, ensuring stable output voltag
e.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the IC.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The 1MHz (TYP .) of frequency is fixed internally. Clock puls generated in this circuit are ud to produce ramp waveforms needed for PWM operation.
<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the FB pin voltage. When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier increas. Gain and frequency characteristics of the error amplifier output are fixed internally as an optimize signal. <Current Limit >
顺德翻译公司
The current limit circuit of the XC9119D10A ries monitors the current flowing through the N-channel MOS driver transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the duty cycle limit of the next pul.
①When the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the puls from the Lx pin at any given timing.
②The IC controls the next pul to be smaller than the first pul.
Current Limit Current Limit
2
1
Lx
IL
The current will be off when the coil current reaches the value of the constant current limit.
Limit some duty puls after the limit.
<CE Pin Function>
rdb
The operation of the XC9119D10A ries will enter into the shut down mode when a low level signal is input to the CE pin. During the shut down mode, the supply current is 0μA (TYP .), with high impedance at the Lx pin. The IC starts its operation with a high level signal to the CE pin. The input to the CE pin is a CMOS input and the sink current is 0μA (TYP .). The hysteresis between the chip enable and the chip disable is 50mV (TYP .). <Soft-Start Time>
Soft-start function operates when capacitors and resistors are connected to the CE/SS pin. With the Vref voltage limited by the CE/SS pin start-up voltage and applying the input to the error amps, the operation maintains a balance between the two inputs of the error amps. and controls the Lx pin’s ON time so that it doesn’t increa more than is necessary. Depending of current limit function, load current, step-up ratio, and external components, the IC takes about 500uS to 5mS to attain the tting voltage after applying the CE ‘H’ voltage even though the R SS is 0Ω and a soft start capacitor C SS is not connected. (For a numerical constant, plea refer to Note on U.) For longer soft-start time, plea connect R SS and C SS . Soft-start function operates while the CE pin
voltage is between 0V to around 1.9V . Plea be noted that if the CE/SS pin voltage does not start from 0V but is in intermediate potential when the power is turned on etc., soft start function may lo an effect and that will cau a high inrush current and ripple voltage.
