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| 型號(hào)： | UC1827JTR-1 |
| 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, CDIP24 |
| 封裝： | CERAMIC, DIP-24 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 314K |
| 代理商： | UC1827JTR-1 |
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ELECTRICAL CHARACTERISTICS
UC1827-1, UC1827-2
UC2827-1, UC2827-2
UC3827-1, UC3827-2
SLUS365A – APRIL 1999 – REVISED AUGUST 2005
Terminal Functions (continued)
TERMINAL
I/O
DESCRIPTION
N or
NAME
Q
DW
5Soft-start pin requires a capacitor to GND. During soft-start the output of the voltage error amplifier is
SS
4
5
O
clamped to the soft-start capacitor voltage which is slowly charged by an internal current source. In
UVLO, SS is held low.
A bidirectional pin for the oscillator., used to synchronize several chips to the fastest oscillator. Its input
synchronization threshold is 1.4 V. The SYNC voltage is 3.6 V when the oscillator capacitor, CT, is
SYNC
19
21
I
discharged. Otherwise it is 0 V. If the recommended synchronization circuit is not used, a 1 k
or lower
value resistor from SYNC to GND may be needed to increase the fall time of the signal at SYNC.
A voltage source connected to this pin supplies the power for the UC3827. It is recommended to bypass
VCC
23
27
I
this pin to both GND and PGND ground connections with good quality high frequency capacitors
VEA+
14
15
I
Non-inverting input of the voltage error amplifier
VEA-
16
18
I
Inverting input of the voltage error amplifier
VEAO
10
11
O
Output of the voltage error amplifier
Supply voltage for the buck output. The floating driver of the UC3827 uses the bootstrap technique
which requires a reservoir capacitor to store the required energy for the on time of the buck switch. A
V+
1
I
diode must be connected from VCC to V+ to charge the reservoir capacitor. This diode must be able to
withstand VIN. The reservoir capacitor must be connected between V+ and SRC.
Unless otherwise spsecified, V
VCC = 15 V, VV+ = 14.3 V, CCT = 340 pF, RRT = 10 k, RDELAY = 24.3 k, VSRC = VGND = VBUCK=
V
PUSH = VPULL outputs no load, TJ = TA
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SUPPLY
VCC UVLO, Turn-on
8.3
8.8
9.5
V
Hysteresis
0.9
1.2
1.5
V
IVCC
Supply current start
VVCC = 8 V
1000
A
IVCC
Supply current run
32
45
mA
IV+ buck high
0.2
1
2
mA
VOLTAGE ERROR AMPLIFIER
IB
0.5
3
A
VIO
10
mV
AVOL
80
95
dB
GBW(1)
Gain bandwidth
1
4
MHz
VOL
Low-level output voltage
IVEAO = 0 A (No load)
0.3
0.5
V
VOH
High-level output voltage
IVEAO = 0 A (No load)
2.85
3
3.20
V
CURRENT SENSE AMPLIFIER
IB
–1
–5
A
VIO
5
mV
AVOL
80
110
dB
GBW (1)
Gain bandwidth
15
29
MHz
VOL
Low-level output voltage
ICEAO = 0 A (No load)
0.25
0.5
V
VOH
High-level output voltage
ICEAO = 0 A (No load)
3
3.3
V
CMRR
Common mode range(1)
-0.3
2
V
CURRENT ERROR AMPLIFIER
IB
–1
–5
A
VIO
10
mV
AVOL
80
110
dB
(1)
Ensured by design. Not production tested.
5
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相關(guān)代理商/技術(shù)參數(shù) |
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| UC1827L-1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Buck Current/Voltage Fed Push-Pull PWM Controllers |
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| UC182DW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| UC182DWTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| UC182J | 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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