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參數(shù)資料
| 型號(hào)： | V62/03625-04XE |
| 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, SOIC-8 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 730K |
| 代理商： | V62/03625-04XE |
UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP
CURRENT-MODE PWM CONTROLLER
SGLS134B – SEPTEMBER 2002 – REVISED APRIL 2003
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
electrical characteristics, TA = –55_C to 125_C for the UC184xAM-EP, VCC = 15 V (see Note 1),
RT = 10 k, CT = 3.3 nF, and TA = TJ (unless otherwise stated)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PWM Section
Maximum duty cycle
UC1842A, UC1843A
94
96
100
%
Maximum duty cycle
UC1844A, UC1845A
47
48
50
%
Minimum duty cycle
0
%
Total Standby Current
Start-up current
0.3
0.5
mA
Operating supply current
FB = 0 V,
SENSE = 0 V
11
17
mA
VCC internal zener voltage
ICC = 25 mA
30
34
V
NOTES:
1. Adjust VCC above the start threshold before setting at 15 V.
2. Not production tested.
3. Temperature stability, sometimes referred to as average temperature coefficient, is described by the equation:
Temp Stability =
VREF (max) – VREF (min)
TJ (max) – TJ (min)
. VREF (max) and VREF (min) are the maximum and minimum reference voltage
measured over the appropriate temperature range. Note that the extremes in voltage do not necessarily occur at the extremes in
temperature.
4. Output frequency equals oscillator frequency for the UC1842A and UC1843A. Output frequency is one half oscillator frequency for
the UC1844A and UC1845A.
5. This parameter is measured with RT = 10 k to VREF. This contributes approximately 300 A of current to the measurement. The
total current flowing into the RT/C pin will be approximately 300 A higher than the measured value.
6. Parameter measured at trip point of latch with VFB at 0 V.
7. Gain is defined by:
A =
DVCOMP
DVSENSE
; 0
v VSENSE v 0.8 V.
PARAMETER MEASUREMENT INFORMATION
Error Amp can source and sink up to 0.5 mA, and sink up to 2 mA.
Figure 1. Error Amp Configuration
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