參數(shù)資料
型號(hào)： TL2845DG4-8
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁數(shù)： 19/23頁
文件大?。?/td> 620K
代理商： TL2845DG4-8
TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038G JANUARY 1989 REVISED FEBRUARY 2008
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range, VCC = 15 V (see
Note 4), RT = 10 k, CT = 3.3 nF (unless otherwise specified)
reference section
PARAMETER
TEST CONDITIONS
TL284x
TL384x
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
Output voltage
IO = 1 mA,
TA = 25°C
4.95
5
5.05
4.9
5
5.1
V
Line regulation
VCC = 12 V to 25 V
6
20
6
20
mV
Load regulation
IO = 1 mA to 20 mA
6
25
6
25
mV
Temperature coefficient
of output voltage
0.2
0.4
0.2
0.4
mV/
°C
Output voltage
with worst-case variation
VCC = 12 V to 25 V,
IO = 1 mA to 20 mA
4.9
5.1
4.82
5.18
V
Output noise voltage
f = 10 Hz to 10 kHz,
TA = 25°C
50
V
Output-voltage long-term drift
After 1000 h at TA = 25°C
5
25
5
25
mV
Short-circuit output current
30
100
180
30
100
180
mA
All typical values are at TA = 25°C.
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
oscillator section
PARAMETER
TEST CONDITIONS
TL284x
TL384x
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
Oscillator frequency (see Note 5)
TA = 25°C
47
52
57
47
52
57
kHz
Frequency change with supply voltage
VCC = 12 V to 25 V
2
10
2
10
Hz/kHz
Frequency change with temperature
50
Hz/kHz
Peak-to-peak amplitude at RT/CT
1.7
V
All typical values are at TA = 25°C.
NOTES:
4. Adjust VCC above the start threshold before setting it to 15 V.
5. Output frequency equals oscillator frequency for the TLx842 and TLx843. Output frequency is one-half the oscillator frequency for
the TLx844 and TLx845.
error-amplifier section
PARAMETER
TEST CONDITIONS
TL284x
TL384x
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
Feedback input voltage
COMP at 2.5 V
2.45
2.50
2.55
2.42
2.50
2.58
V
Input bias current
0.3
1
0.3
2
A
Open-loop voltage amplification
VO = 2 V to 4 V
65
90
65
90
dB
Gain-bandwidth product
0.7
1
0.7
1
MHz
Supply-voltage rejection ratio
VCC = 12 V to 25 V
60
70
60
70
dB
Output sink current
VFB at 2.7 V,
COMP at 1.1 V
2
6
2
6
mA
Output source current
VFB at 2.3 V,
COMP at 5 V
0.5
0.8
0.5
0.8
mA
High-level output voltage
VFB at 2.3 V,
RL = 15 k to GND
5
6
5
6
V
Low-level output voltage
VFB at 2.7 V,
RL = 15 k to GND
0.7
1.1
0.7
1.1
V
All typical values are at TA = 25°C.
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
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TL2845DRE4 功能描述:電流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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