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| 型號(hào)： | 5962-8990502VEA |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 2.2 A SWITCHING CONTROLLER, 1150 kHz SWITCHING FREQ-MAX, CDIP16 |
| 封裝： | CERAMIC, DIP-16 |
| 文件頁(yè)數(shù)： | 1/18頁(yè) |
| 文件大?。?/td> | 478K |
| 代理商： | 5962-8990502VEA |
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UC1823A,UC2823A,UC2823B,
UC3823A,UC3823B,UC1825A,
UC2825A,UC2825B,UC3825A,UC3825B
SLUS334C AUGUST 1995 REVISED AUGUST 2004
HIGHSPEED PWM CONTROLLER
FEATURES
D Improved Versions of the UC3823/UC3825
PWMs
D Compatible with Voltage-Mode or
Current-Mode Control Methods
D Practical Operation at Switching Frequencies
to 1 MHz
D 50-ns Propagation Delay to Output
D High-Current Dual Totem Pole Outputs
(2-A Peak)
D Trimmed Oscillator Discharge Current
D Low 100-A Startup Current
D Pulse-by-Pulse Current Limiting Comparator
D Latched Overcurrent Comparator With Full
Cycle Restart
DESCRIPTION
The UC3823A and UC3823B and the UC3825A and
UC3825B family of PWM controllers are improved
versions of the standard UC3823 and UC3825 family.
Performance enhancements have been made to several
of the circuit blocks. Error amplifier gain bandwidth product
is 12 MHz, while input offset voltage is 2 mV. Current limit
threshold is assured to a tolerance of 5%. Oscillator
discharge current is specified at 10 mA for accurate dead
time control. Frequency accuracy is improved to 6%.
Startup supply current, typically 100
A, is ideal for off-line
applications. The output drivers are redesigned to actively
sink current during UVLO at no expense to the startup
current specification. In addition each output is capable of
2-A peak currents during transitions.
BLOCK DIAGRAM
4
5
6
7
3
2
1
OSC
CLK/LEB
RT
CT
RAMP
EAOUT
NI
INV
8
9
15
SS
ILIM
VCC
1.25 V
10
GND
(60%)
1.0 V
E/A
1.2 V
0.2 V
OVER CURRENT
CURRENT
LIMIT
R
SD
5 V
SOFTSTART COMPLETE
R
SD
FAULT LATCH
RESTART
DELAY
T
13
11
14
VC
12
PWM
LATCH
9
mA
250
mA
R
S
*
RESTART
DELAY
LATCH
VREF
5.1 V
ON/OFF
UVLO
4 V
INTERNAL
BIAS
16
OUTA
OUTB
PGND
5.1 VREF
”B” 16V/10V
”A” 9.2V/8.4V
PWM COMPARATOR
UDG02091
VREF GOOD
* On the UC1823A version, toggles Q and Q are always low.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
www.ti.com
Copyright
2004, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
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