參數(shù)資料
型號(hào)： UC1827JTR-1
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 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)： 13/16頁(yè)
文件大小： 314K
代理商： UC1827JTR-1
www.ti.com
UC1827-1, UC1827-2
UC2827-1, UC2827-2
UC3827-1, UC3827-2
SLUS365A – APRIL 1999 – REVISED AUGUST 2005
ELECTRICAL CHARACTERISTICS (continued)
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
GBW(1)
Gain bandwidth
At 100 kHz, Measure Gain
2
4.5
MHz
VOL
ICEAO = 0 A (No Load)
0.25
0.5
V
VOH
ICEAO = 0 A (No Load)
3.3
3.5
V
CMRR
Common mode range(1)
-0.3
5
V
OSCILLATOR SECTION
fOSC
Frequency
180
220
250
kHz
ICT(dsch)
CT discharge current
3.5V at CT when CT removed
5
mA
PWM COMPARATOR
DMAX
Minimum duty cycle
200 kHz
0%
DMAX
Maximum duty cycle
200 kHz
85%
91%
95%
BUCK OUTPUT STAGE
tRISE
Rise time
1 nF Load(2)
40
100
ns
tFALL
Fall tIme
1 nF, Load
30
80
ns
IBUCK = –15 mA , V+ –BUCK(3)
1.5
2.5
V
VOH
High-level output voltage
IBUCK = –150 mA, V+ –BUCK (3)
2
2.5
V
IBUCK = 15 mA(4)
0.2
0.4
V
VOL
Low-level output voltage
IBUCK = 150 mA (4)
0.7
1.2
V
PUSH/PULL OUTPUT STAGES
tRISE
Rise time
1 nF load
50
100
ns
tFALL
Fall tIme
1 nF load
35
100
ns
Overlap time
UCx827-1
1 nF loads(5)
100
250
400
ns
Nonoverlapping time (6)
UCx827-2
100
250
500
ns
IPUSH/PULL = –10 mA, VCC – PUSH
2
3
V
(7)
VOH
High-level output voltage
IPUSH/PULL = –100 mA, VCC –
2.5
3
V
PUSH(7)
IPUSH/PULL = 10 mA(7)
0.2
0.8
V
VOL
Low-level output voltage
IPUSH/PULL = 100 mA(7)
0.6
1.2
V
REFERENCE
Reference voltage
4.8
5
5.2
V
ISC
Shor-circuit current
VREF = 0V
–35
–50
–65
mA
Line regulation
0.5V < VVCC < 20 V
5
20
mV
Load regulation
0 mA < IIO < 10 mA
8
20
mV
SOFT START
VOL
Low-level output voltage saturation
VVCC = 7 V
250
500
mV
ISS
Soft-start current
–5
–12
–25
A
(2)
Measure the rise time from when BUCK crosses 1 V until it crosses 9 V.
(3)
To force BUCK high, force VCSAO=2.5 V, VCEAO = 2.5 V, a 25-k pulldown resistor from RAMP to ground, and VCT = 0.5 V.
(4)
To force BUCK low, force VCSAO = 2.5 V, VCEAO = 2.5 V, a 10-k pulldown resistor from RAMP to ground, and VCT = 3.5 V.
(5)
The overlap time is measured from the point at which the rising edge of PUSH/PULL crosses 5 V until the falling edge of PULL/PUSH
crosses 5V.
(6)
The non-overlap time is measured from the point at which the falling edge of PUSH/PULL crosses 5 V until the rising edge of
PULL/PUSH crosses 5 V.
(7)
To toggle PUSH or PULL into a desired state, pulse CT from 0.5 V to 3.5 V. PUSH and PULL toggle on the rising edge of CT.
6
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