TL5001AQDRQ1 [TI]

PULSE-WIDTH-MODULATION CONTROL CIRCUITS; 脉宽调制控制电路
TL5001AQDRQ1
型号: TL5001AQDRQ1
厂家: TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述:

PULSE-WIDTH-MODULATION CONTROL CIRCUITS
脉宽调制控制电路

稳压器 开关式稳压器或控制器 电源电路 开关式控制器 光电二极管 PC
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TL5001A-Q1  
www.ti.com .............................................................................................................................................. SLVS603BAUGUST 2005REVISED FEBRUARY 2009  
PULSE-WIDTH-MODULATION CONTROL CIRCUITS  
1
FEATURES  
D PACKAGE  
(TOP VIEW)  
Qualified for Automotive Applications  
Complete PWM Power Control  
OUT  
GND  
RT  
DTC  
SCP  
1
2
3
4
8
7
6
5
3.6-V to 40-V Operation  
V
CC  
Internal Undervoltage-Lockout Circuit  
Internal Short-Circuit Protection  
Oscillator Frequency: 20 kHz to 500 kHz  
COMP  
FB  
Variable Dead Time Provides Control Over  
Total Range  
±3% Tolerance on Reference Voltage  
Available in Q-Temperature Automotive  
High-Reliability Automotive Applications  
Configuration Control / Print Support  
Qualification to Automotive Standards  
DESCRIPTION  
The TL5001A incorporates on a single monolithic chip all the functions required for a pulse-width-modulation  
(PWM) control circuit. Designed primarily for power-supply control, the TL5001A contains an error amplifier, a  
regulator, an oscillator, a PWM comparator with a dead-time-control input, undervoltage lockout (UVLO),  
short-circuit protection (SCP), and an open-collector output transistor. The TL5001A has a typical reference  
voltage tolerance of ±3%.  
The error-amplifier common-mode voltage ranges from 0 V to 1.5 V. The noninverting input of the error amplifier  
is connected to a 1-V reference. Dead-time control (DTC) can be set to provide 0% to 100% dead time by  
connecting an external resistor between DTC and GND. The oscillator frequency is set by terminating RT with an  
external resistor to GND. During low VCC conditions, the UVLO circuit turns the output off until VCC recovers to its  
normal operating range.  
The TL5001A is characterized for operation from –40°C to 125°C.  
AVAILABLE OPTIONS(1)  
PACKAGED DEVICES(2)  
TA  
SMALL OUTLINE  
(D)(3)  
–40°C to 125°C  
TL5001AQDRQ1  
(1) For the most current package and ordering information, see the  
Package Option Addendum at the end of this document, or see the  
TI web site at www.ti.com.  
(2) Package drawings, thermal data, and symbolization are available at  
www.ti.com/packaging.  
(3) The D package is available taped and reeled. Add the suffix R to the  
device type (e.g., TL5001ADR).  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2005–2009, Texas Instruments Incorporated  
TL5001A-Q1  
SLVS603BAUGUST 2005REVISED FEBRUARY 2009.............................................................................................................................................. www.ti.com  
SCHEMATIC FOR TYPICAL APPLICATION  
V
I
+
TPS1101  
V
O
+
2
V
CC  
1
3
5
SCP  
V
O
COMP  
TL5001A  
DTC  
6
7
4
FB  
RT  
GND  
8
FUNCTIONAL BLOCK DIAGRAM  
V
DTC  
6
RT  
7
OUT  
1
CC  
2
UVLO  
I
DT  
2.5 V  
1 V  
1 V  
Reference  
Voltage  
1.5 V  
OSC  
PWM/DTC  
Comparator  
Error  
Amplifier  
SCP  
Comparator 1  
+
4
3
FB  
COMP  
SCP  
Comparator 2  
5
SCP  
8
GND  
2
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Product Folder Link(s): TL5001A-Q1  
TL5001A-Q1  
www.ti.com .............................................................................................................................................. SLVS603BAUGUST 2005REVISED FEBRUARY 2009  
DETAILED DESCRIPTION  
VOLTAGE REFERENCE  
A 2.5-V regulator operating from VCC is used to power the internal circuitry of the TL5001A and as a reference for  
the error amplifier and SCP circuits. A resistive divider provides a 1-V reference for the error amplifier  
noninverting input which typically is within 2% of nominal over the operating temperature range.  
ERROR AMPLIFIER  
The error amplifier compares a sample of the dc-to-dc converter output voltage to the 1-V reference and  
generates an error signal for the PWM comparator. The dc-to-dc converter output voltage is set by selecting the  
error-amplifier gain (see Figure 1), using the following expression:  
VO = (1 + R1/R2) (1 V)  
TL5001/A  
3
4
COMP  
FB  
Compensation  
Network  
R1  
V
I(FB)  
To PWM  
Comparator  
R2  
+
V
ref  
= 1 V  
8
GND  
Figure 1. Error-Amplifier Gain Setting  
The error-amplifier output is brought out as COMP for use in compensating the dc-to-dc converter control loop for  
stability. Because the amplifier can only source 45 µA, the total dc-load resistance should be 100 kor more.  
OSCILLATOR/PWM  
The oscillator frequency (fosc) can be set between 20 kHz and 500 kHz by connecting a resistor between RT and  
GND. Acceptable resistor values range from 15 kto 250 k. The oscillator frequency can be determined by  
using the graph shown in Figure 5.  
The oscillator output is a triangular wave with a minimum value of approximately 0.7 V and a maximum value of  
approximately 1.3 V. The PWM comparator compares the error-amplifier output voltage and the DTC input  
voltage to the triangular wave and turns the output transistor off whenever the triangular wave is greater than the  
lesser of the two inputs.  
DEAD-TIME CONTROL (DTC)  
DTC provides a means of limiting the output-switch duty cycle to a value less than 100%, which is critical for  
boost and flyback converters. A current source generates a reference current (IDT) at DTC that is nominally equal  
to the current at the oscillator timing terminal (RT). Connecting a resistor between DTC and GND generates a  
dead-time reference voltage (VDT), which the PWM/DTC comparator compares to the oscillator triangle wave as  
described in the previous section. Nominally, the maximum duty cycle is 0% when VDT is 0.7 V or less and  
100% when VDT is 1.3 V or greater. Because the triangle wave amplitude is a function of frequency and the  
source impedance of RT is relatively high (1250 ), choosing RDT for a specific maximum duty cycle (D) is  
accomplished using the following equation and the voltage limits for the frequency in question as found in  
Figure 11 (Voscmax and Voscmin are the maximum and minimum oscillator levels):  
(
) [ (  
)
]
RDT + Rt ) 1250 D Vosc max * Vosc min ) Vosc min  
; VRT + 1 V  
VRT  
(1)  
Where  
RDT and Rt are in , D is in decimal  
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Soft start can be implemented by paralleling the DTC resistor with a capacitor (CDT) as shown in Figure 2. During  
soft start, the voltaǒge at DTC is derived by the following equation:  
DTǓ  
t
VDT [ IDTRDT 1 * e*  
R
C
DT  
(2)  
6
DTC  
TL5001/A  
C
DT  
R
DT  
Figure 2. Soft-Start Circuit  
If the dc-to-dc converter must be in regulation within a specified period of time, the time constant (RDTCDT) should  
be t0/3 to t0/5. The TL5001A remains off until VDT 0.7 V, the minimum ramp value. CDT is discharged every time  
UVLO or SCP becomes active.  
UNDERVOLTAGE-LOCKOUT (UVLO) PROTECTION  
The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply  
voltage drops too low (approximately 3 V at 25°C) for proper operation. A hysteresis voltage of 200 mV  
eliminates false triggering on noise and chattering.  
SHORT-CIRCUIT PROTECTION (SCP)  
The TL5001A includes short-circuit protection (see Figure 3), which turns the power switch off to prevent damage  
when the converter output is shorted. When activated, the SCP prevents the switch from being turned on until  
the internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes active  
or until the SCP terminal is pulled to ground externally.  
When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle in  
an attempt to maintain the output voltage. SCP comparator 1 starts an RC timing circuit when COMP exceeds  
1.5 V. If the short is removed and the error-amplifier output drops below 1.5 V before time out, normal converter  
operation continues. If the fault is still present at the end of the time-out period, the timer sets the latching circuit  
and turns off the TL5001/A output transistor.  
2.5 V  
R
SCP  
185 k  
12 kΩ  
SCP  
Comparator 2  
C
SCP  
SCP  
To Output  
Drive Logic  
5
From Error  
Amp  
Q1  
V
ref  
= 1 V  
SCP  
1.5 V  
Comparator 1  
Q2  
Figure 3. SCP Circuit  
4
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The timer operates by charging an external capacitor (CSCP) connected between the SCP terminal and ground,  
towards 2.5 V through a 185-kresistor (RSCP). The circuit begins charging from an initial voltage of  
approximately 185 mV and times out when the capacitor voltage reaches 1 V. The output of SCP comparator 2  
then goes high, turns on Q2, and latches the timer circuit. The expression for setting the SCP time period is  
derived from Equation 3:  
VSCP = (2.5 – 0.185) (1 – e–t/τ) + 0.185  
(3)  
Where  
τ = RSCPCSCP  
The end of the time-out period (tSCP) occurs when VSCP = 1 V. Solving for CSCP yields Equation 4:  
CSCP = 12.46 × tSCP  
(4)  
Where  
t is in seconds, C is in µF  
tSCP must be much longer (generally 10 to 15 times) than the converter start-up period, or the converter will not  
start.  
OUTPUT TRANSISTOR  
The output of the TL5001A is an open-collector transistor with a maximum collector current rating of 21 mA and a  
voltage rating of 51 V. The output is turned on under the following conditions: the oscillator triangle wave is lower  
than both the DTC voltage and the error-amplifier output voltage, the UVLO circuit is inactive, and the  
short-circuit protection circuit is inactive.  
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TL5001A-Q1  
SLVS603BAUGUST 2005REVISED FEBRUARY 2009.............................................................................................................................................. www.ti.com  
ABSOLUTE MAXIMUM RATINGS  
over operating free-air temperature range (unless otherwise noted)  
(1)  
VCC  
VI(FB)  
VO  
Supply voltage(2)  
41 V  
20 V  
Amplifier input voltage  
Output voltage, OUT  
51 V  
IO  
Output current, OUT  
21 mA  
IO(peak)  
Output peak current, OUT  
100 mA  
Continuous total power dissipation  
Operating ambient temperature range, TL5001AQDRQ1  
Storage temperature range  
See Dissipation Rating  
–40°C to 125°C  
–65°C to 150°C  
260°C  
TA  
Tstg  
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds  
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings  
only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating  
conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.  
(2) All voltage values are with respect to network ground terminal.  
DISSIPATION RATINGS  
PACKAGE  
T
A 25°C  
DERATING FACTOR  
ABOVE TA = 25°C  
TA = 70°C  
POWER RATING  
TA = 85°C  
POWER RATING  
TA = 125°C  
POWER RATING  
POWER RATING  
D
725 mW  
5.8 mW/°C  
464 mW  
377 mW  
145 mW  
RECOMMENDED OPERATING CONDITIONS  
MIN  
MAX  
40  
UNIT  
V
VCC  
VI(FB)  
VO  
Supply voltage  
3.6  
0
Amplifier input voltage  
Output voltage, OUT  
Output current, OUT  
COMP source current  
COMP dc load resistance  
Oscillator timing resistor  
Oscillator frequency  
1.5  
50  
V
V
IO  
20  
mA  
µA  
k  
kΩ  
kHz  
°C  
45  
100  
15  
Rt  
250  
500  
125  
fOSC  
TA  
20  
Operating ambient temperature  
TL5001AQDRQ1  
–40  
6
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TL5001A-Q1  
www.ti.com .............................................................................................................................................. SLVS603BAUGUST 2005REVISED FEBRUARY 2009  
ELECTRICAL CHARACTERISTICS  
over recommended operating free-air temperature range, VCC = 6 V, fosc = 100 kHz (unless otherwise noted)  
TL5001AQ  
MIN TYP(1)  
PARAMETER  
TEST CONDITIONS  
UNIT  
MAX  
REFERENCE  
Output voltage  
Input regulation  
TA = 25°C  
0.97  
0.94  
1
0.98  
2
1.03  
1.06  
12.5  
COMP connected to FB  
VCC = 3.6 V to 40 V  
V
TA = MIN to MAX  
TA = MIN to MAX,  
TA = MIN to MAX  
mV  
Output voltage change with temperature  
–6%(2)  
2% 6%(2)  
UNDERVOLTAGE LOCKOUT  
TA = MIN, 25°C  
TA = MAX  
3
2.55  
Upper threshold voltage  
V
TA = MIN, 25°C  
TA = MAX  
2.8  
2.0  
Lower threshold voltage  
Hysteresis  
V
mV  
V
TA = MIN to MAX  
TA = MIN, 25°C  
TA = MAX  
80  
2.1  
200  
2.55  
0.63  
Reset threshold voltage  
SHORT-CIRCUIT PROTECTION  
SCP threshold voltage  
0.35  
TA = MIN, 25°C  
TA = MAX  
0.97  
0.94  
140  
1
0.98  
185  
60  
1.03  
1.06  
230  
120  
V
SCP voltage, latched  
TA = MIN to MAX  
TA = MIN to MAX  
TA = MIN to MAX  
TA = MIN to MAX  
No pullup  
No pullup  
mV  
mV  
kΩ  
V
SCP voltage, UVLO standby  
Equivalent timing resistance  
SCP comparator 1 threshold voltage  
OSCILLATOR  
185  
1.5  
Frequency  
TA = MIN to MAX  
TA = MIN to MAX  
TA = MIN to MAX  
Rt = 100 kΩ  
100  
2
kHz  
kHz  
kHz  
Standard deviation of frequency  
Frequency change with voltage  
VCC = 3.6 V to 40 V  
Q suffix  
1
–9(2)  
–9(2)  
5
9(2)  
9(2)  
Frequency change with temperature  
TA = MIN to MAX  
TA = MIN to MAX  
kHz  
V
M suffix  
5
Voltage at RT  
1
DEAD-TIME CONTROL  
TA = MIN to MAX  
V(DT) = 1.5 V  
0.9 ×  
IRT  
1.1 ×  
IRT  
Output (source) current  
Input threshold voltage  
µA  
(3)  
(3)  
Duty cycle 0%  
Duty cycle 100%  
Duty cycle 0%  
Duty cycle 100%  
0.5  
0.4  
0.7  
1.3  
0.7  
1.3  
TA = 25°C  
1.5  
1.7  
V
TA = MIN to MAX  
(1) All typical values are at TA = 25°C.  
(2) Not production tested.  
(3) Output source current at RT  
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SLVS603BAUGUST 2005REVISED FEBRUARY 2009.............................................................................................................................................. www.ti.com  
ELECTRICAL CHARACTERISTICS  
over recommended operating free-air temperature range, VCC = 6 V, fosc = 100 kHz (unless otherwise noted)  
TL5001AQ  
PARAMETER  
ERROR AMPLIFIER  
TEST CONDITIONS  
UNIT  
MIN  
TYP(1)  
MAX  
–500  
0.4  
Input bias current  
TA = MIN to MAX  
TA = MIN to MAX  
–160  
2.3  
nA  
V
Positive  
1.5  
Output voltage swing  
Negative  
0.3  
V
Open-loop voltage amplification  
Unity gain bandwidth  
TA = MIN to MAX  
TA = MIN to MAX  
TA = MIN to MAX  
TA = MIN, 25°C  
TA = MAX  
80  
dB  
MHz  
µA  
1.5  
Output (sink) current  
VI(FB) = 1.2 V, COMP = 1 V  
100  
–45  
–30  
600  
–70  
–45  
Output (source) current  
VI(FB) = 0 V, COMP = 1 V  
µA  
OUTPUT  
Output saturation voltage  
TA = MIN to MAX  
TA = MIN to MAX  
IO = 10 mA  
1.5  
40  
2
10  
10  
V
VO = 50 V, VCC = 0  
VO = 50 V  
Off-state current  
µA  
mA  
Short-circuit output current  
TA = MIN to MAX  
VO = 6 V  
TOTAL DEVICE  
Standby supply current  
Average supply current  
Off state  
TA = MIN to MAX  
TA = MIN to MAX  
1
1.5  
2.1  
mA  
mA  
RL = 100 kΩ  
1.4  
(1) All typical values are at TA = 25°C.  
8
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PARAMETER MEASUREMENT INFORMATION  
2.3 V  
COMP  
1.5 V  
DTC  
OSC  
PWM/DTC  
Comparator  
OUT  
SCP  
Comparator 1  
1 V  
SCP  
SCP Timing Period  
SCP  
Comparator 2  
0 V  
3 V  
V
CC  
A. The waveforms show timing characteristics for an intermittent short circuit and a longer short circuit that is sufficient to  
activate SCP.  
Figure 4. PWM Timing Diagram  
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SLVS603BAUGUST 2005REVISED FEBRUARY 2009.............................................................................................................................................. www.ti.com  
TYPICAL CHARACTERISTICS  
OSCILLATOR FREQUENCY  
vs  
OSCILLATION FREQUENCY  
vs  
AMBIENT TEMPERATURE  
TIMING RESISTANCE  
1 M  
100  
98  
96  
94  
92  
90  
88  
V
= 6 V  
CC  
V
= 6 V  
CC  
DT Resistance = R  
T = 25°C  
A
t
R = 100 k  
DT Resistance = 100 kΩ  
t
100 k  
10 k  
10 k  
100 k  
1 M  
− 50  
− 25  
0
25  
50  
75  
100  
R − Timing Resistance − Ω  
t
T − Ambient Temperature − °C  
A
Figure 5.  
Figure 6.  
REFERENCE OUTPUT VOLTAGE  
vs  
POWER-SUPPLY VOLTAGE  
REFERENCE OUTPUT VOLTAGE FLUCTUATION  
vs  
AMBIENT TEMPERATURE  
2
1.8  
1.6  
1.4  
1.2  
1
0.6  
T = 25°C  
FB and COMP  
Connected Together  
A
V
= 6 V  
CC  
FB and COMP  
Connected Together  
0.4  
0.2  
0
− 0.2  
0.8  
0.6  
− 0.4  
− 0.6  
0.4  
0.2  
0
− 0.8  
0
1
2
3
4
5
6
7
8
9
10  
− 50  
− 25  
0
25  
50  
75  
100  
V
CC  
− Power-Supply Voltage − V  
T − Ambient Temperature − °C  
A
Figure 7.  
Figure 8.  
10  
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TYPICAL CHARACTERISTICS (continued)  
AVERAGE SUPPLY CURRENT  
vs  
POWER-SUPPLY VOLTAGE  
AVERAGE SUPPLY CURRENT  
vs  
AMBIENT TEMPERATURE  
1.3  
1.2  
1.1  
1
2
1.5  
1
R = 100 k  
V
= 6 V  
t
CC  
T
= 25 °C  
R = 100 k  
DT Resistance = 100 kΩ  
A
t
0.9  
0.8  
0
0.5  
0
− 50  
− 25  
0
25  
50  
75  
100  
0
10  
20  
30  
40  
T
A
− Ambient Temperature − °C  
V
CC  
− Power-Supply Voltage − V  
Figure 9.  
Figure 10.  
PWM TRIANGLE WAVE AMPLITUDE VOLTAGE  
ERROR AMPLIFIER OUTPUT VOLTAGE  
vs  
vs  
OSCILLATOR FREQUENCY  
OUTPUT (SINK) CURRENT  
3
2.5  
2
1.8  
1.5  
1.2  
V
V
T
= 6 V  
= 1.2 V  
V
T
A
= 6 V  
= 25 °C  
CC  
I(FB)  
CC  
°
A = 25  
C
V max (100% duty cycle)  
osc  
1.5  
1
0.9  
0.6  
V min (zero duty cycle)  
osc  
0.5  
0
0.3  
0
10 k  
100 k  
1 M  
10 M  
0
0.2  
0.4  
0.6  
f
− Oscillator Frequency − Hz  
osc  
I
O
− Output (Sink) Current − mA  
Figure 11.  
Figure 12.  
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SLVS603BAUGUST 2005REVISED FEBRUARY 2009.............................................................................................................................................. www.ti.com  
TYPICAL CHARACTERISTICS (continued)  
ERROR AMPLIFIER OUTPUT VOLTAGE  
ERROR AMPLIFIER OUTPUT VOLTAGE  
vs  
vs  
OUTPUT (SOURCE) CURRENT  
AMBIENT TEMPERATURE  
3
2.5  
2
2.46  
2.45  
2.44  
2.43  
2.42  
2.41  
2.40  
V
V
T
A
= 6 V  
= 0.8 V  
= 25 °C  
CC  
I(FB)  
V
V
= 6 V  
CC  
= 0.8 V  
I(FB)  
No Load  
1.5  
1
0.5  
0
0
20  
40  
60  
80  
100  
120  
− 50  
− 25  
0
25  
50  
75  
100  
I
O
− Output (Source) Current − µA  
T − Ambient Temperature − °C  
A
Figure 13.  
Figure 14.  
ERROR AMPLIFIER OPEN-LOOP GAIN  
ERROR AMPLIFIER OUTPUT VOLTAGE  
AND PHASE SHIFT  
vs  
vs  
AMBIENT TEMPERATURE  
FREQUENCY  
240  
40  
−180°  
V
= 6 V  
= 1.2 V  
V
T
= 6 V  
= 25 °C  
CC  
CC  
V
I(FB)  
A
No Load  
220  
200  
180  
160  
30  
20  
−210°  
−240°  
−270°  
−300°  
−330°  
−360°  
A
V
10  
0
φ
140  
120  
− 10  
− 20  
− 50  
− 25  
0
25  
50  
75  
100  
10 k  
100 k  
1 M  
10 M  
T − Ambient Temperature − °C  
A
f − Frequency − Hz  
Figure 15.  
Figure 16.  
12  
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Product Folder Link(s): TL5001A-Q1  
TL5001A-Q1  
www.ti.com .............................................................................................................................................. SLVS603BAUGUST 2005REVISED FEBRUARY 2009  
TYPICAL CHARACTERISTICS (continued)  
OUTPUT DUTY CYCLE  
vs  
SCP TIME-OUT PERIOD  
vs  
SCP CAPACITANCE  
DTC VOLTAGE  
120  
100  
80  
60  
40  
20  
0
12  
10  
8
V
= 6 V  
V
= 6 V  
CC  
CC  
R = 100 k  
T = 25 °C  
A
R = 100 k  
DT Resistance = 200 kΩ  
T
A
t
t
= 25 °C  
6
4
2
0
0
0.5  
1
1.5  
2
0
20  
C
40  
60  
80  
100  
120  
DTC Voltage − V  
− SCP Capacitance − nF  
SCP  
Figure 17.  
Figure 18.  
DTC OUTPUT CURRENT  
vs  
RT OUTPUT CURRENT  
OUTPUT SATURATION VOLTAGE  
vs  
OUTPUT (SINK) CURRENT  
2
− 60  
− 50  
− 40  
− 30  
− 20  
− 10  
0
DT Voltage = 1.3 V  
V
T
= 6 V  
= 25 °C  
CC  
T
A
= 25 °C  
A
1.5  
1
0.5  
0
0
− 10  
− 20  
− 30  
− 40  
− 50  
− 60  
0
5
10  
15  
20  
I
O
− Output (Sink) Current − mA  
I
O
− RT Output Current − µA  
Figure 19.  
Figure 20.  
Copyright © 2005–2009, Texas Instruments Incorporated  
Submit Documentation Feedback  
13  
Product Folder Link(s): TL5001A-Q1  
TL5001A-Q1  
SLVS603BAUGUST 2005REVISED FEBRUARY 2009.............................................................................................................................................. www.ti.com  
APPLICATION INFORMATION  
V
I
5 V  
R1  
470  
+
C1  
100 µF  
10 V  
Q1  
TPS1101  
GND  
L1  
20 µH  
3.3 V  
GND  
C3  
0.1 µF  
CR1  
MBRS140T3  
+
C2  
2
100 µF  
V
C4  
1 µF  
CC  
10 V  
1
5
SCP  
V
O
+
C5  
0.1 µF  
3
4
COMP  
R7  
2.0 kΩ  
R5  
7.50 kΩ  
1%  
U1  
C6  
0.012 µF  
R2  
56 kΩ  
TL5001A  
6
7
C7  
0.0047 µF  
DTC  
R4  
5.1 kΩ  
R3  
43 kΩ  
FB  
RT  
R6  
3.24 kΩ  
1%  
GND  
8
Partial Bill of Materials:  
U1  
Q1  
LI  
TL5001A  
TPS1101  
CTX20-1 or  
Texas Instruments  
Texas Instruments  
Coiltronics  
23 turns of #28 wire on  
Micrometals No. T50-26B core  
TPSD107M010R0100  
TPSD107M010R0100  
MBRS140T3  
C1  
C2  
CR1  
AVX  
AVX  
Motorola  
A. Frequency = 200 kHz  
B. Duty cycle = 90% max  
C. Soft-start time constant (TC) = 5.6 ms  
D. SCP TC = 70 ms  
Figure 21. Step Down Converter  
14  
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Product Folder Link(s): TL5001A-Q1  
PACKAGE OPTION ADDENDUM  
www.ti.com  
26-Mar-2010  
PACKAGING INFORMATION  
Orderable Device  
TL5001AQDRG4Q1  
TL5001AQDRQ1  
Status (1)  
ACTIVE  
ACTIVE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
SOIC  
D
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
SOIC  
D
8
2500 Green (RoHS & CU NIPDAU Level-1-260C-UNLIM  
no Sb/Br)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in  
a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2)  
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check  
http://www.ti.com/productcontent for the latest availability information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements  
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered  
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and  
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS  
compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame  
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)  
(3)  
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder  
temperature.  
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OTHER QUALIFIED VERSIONS OF TL5001A-Q1 :  
Catalog: TL5001A  
Military: TL5001AM  
NOTE: Qualified Version Definitions:  
Catalog - TI's standard catalog product  
Military - QML certified for Military and Defense Applications  
Addendum-Page 1  
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