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參數(shù)資料
| 型號： | UC1870DW-2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 352K |
| 代理商： | UC1870DW-2 |
8
UC1870 -1/ -2
UC2870 -1/ -2
UC3870 -1/ -2
4
5
6
7
8
9
10
11
-75
-25
25
75
125
TEMPERATURE °C
I
C
TYPICAL PERFORMANCE INFORMATION
Figure 1. Supply Current
ductor by disabling the low side gate drive signal during
discontinuous mode operation. This increases efficiency
by eliminating unnecessary I
2
R losses in the MOSFET
and the inductor.
Soft start is recommended for Buck converters to reduce
stress on the power components during startup, and to
reduce overshoot of the output voltage. This improves
reliability. The UC3870 includes a user programmable
soft start pin to implement this feature. An internal 10mA
current source charges the external soft start capacitor
which provides a clamp at the output of the voltage
amplifier. An ultra low power sleep mode is also invoked
from the SS pin. A voltage level below 0.5V on this pin
reduces total standby current to less than 50mA. Short
circuit protection is inherent to the average current mode
technique with proper compensation of the current
amplifier. To prevent operation of the MOSFETs with an
inadequete drive signal, an undervoltage lockout circuit
suppresses the output drivers until the input supply
voltage is sufficiently high enough for proper operation.
The UC3870-1 is intended for applications with logic
level MOSFETs and its VCC turn-on and turn-off
thresholds are 4.5V/4.4V respectively. The UC3870-2 is
intended for applications with standard MOSFETs and
has UVLO turn-on and turn-off thresholds of 10V and 9V
respectively. The precision 2.5V reference can provide
10mA to power external circuitry. The reference output is
disabled during UVLO and sleep modes.
APPLICATION INFOMATION (continued)
560
600
640
680
720
760
-50
-25
0
25
50
75
100
TEMPERATURE °C
T
Figure 2. Volt Amp GM (I
OUT
=
10 A)
80
90
100
110
120
130
140
-75
-25
25
75
125
TEMPERATURE °C
F
Figure 3. Oscillator Frequency vs. Temperature
(CT = 680pF)
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| UC1870L-2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| UC1870N-1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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