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參數(shù)資料
| 型號： | TL3845Y |
| 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, UUC8 |
| 封裝： | DIE-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | TL3845Y |
TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038E – JANUARY 1989 – REVISED DECEMBER 1999
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics, VCC = 15 V (see Note 4), RT = 10 k, CT = 3.3 nF, TA= 25°C (unless otherwise
specified) (continued)
error-amplifier section
PARAMETER
TEST CONDITIONS
TL384xY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Feedback input voltage
COMP at 2.5 V
2.50
V
Input bias current
–0.3
A
Open-loop voltage amplification
VO = 2 V to 4 V
90
dB
Gain-bandwidth product
1
MHz
Supply-voltage rejection ratio
VCC = 12 V to 25 V
70
dB
Output sink current
VFB at 2.7 V,
COMP at 1.1 V
6
mA
Output source current
VFB at 2.3 V,
COMP at 5 V
–0.8
mA
High-level output voltage
VFB at 2.3 V,
RL = 15 k to GND
6
V
Low-level output voltage
VFB at 2.7 V,
RL = 15 k to GND
0.7
V
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
current-sense section
PARAMETER
TEST CONDITIONS
TL384xY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Voltage amplification
See Notes 6 and 7
3
V/V
Current-sense comparator threshold
COMP at 5 V,
See Note 6
1
V
Supply-voltage rejection ratio
VCC = 12 V to 25 V,
See Note 6
70
dB
Input bias current
–2
A
Delay time to output
150
ns
NOTES:
4. Adjust VCC above the start threshold before setting it to 15 V.
6. These parameters are measured at the trip point of the latch, with VFB at 0 V.
7. Voltage amplification is measured between ISENSE and COMP, with the input changing from 0 V to 0.8 V.
output section
PARAMETER
TEST CONDITIONS
TL384xY
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
High level output voltage
IOH = –20 mA
13.5
V
High-level output voltage
IOH = –200 mA
13.5
V
Low level output voltage
IOL = 20 mA
0.1
V
Low-level output voltage
IOL = 200 mA
1.5
V
Rise time
CL = 1 nF
50
ns
Fall time
CL = 1 nF
50
ns
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
undervoltage-lockout section
PARAMETER
TL384xY
UNIT
PARAMETER
MIN
TYP
MAX
UNIT
Start threshold voltage
TL3842Y, TL3844Y
16
V
Start threshold voltage
TL3843Y, TL3845Y
8.4
V
Minimum operating voltage after startup
TL3842Y, TL3844Y
10
V
Minimum operating voltage after startup
TL3843Y, TL3845Y
7.6
V
NOTE 4: Adjust VCC above the start threshold before setting it to 15 V.
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