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UCC2570D Datasheet

  • UCC2570D

  • Low Power Pulse Width Modulator

  • 9頁

  • TI

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UCC1570
UCC2570
UCC3570
Low Power Pulse Width Modulator
FEATURES
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Low Power BiCMOS Process
鈥?/div>
85碌A Start-up Current
鈥?/div>
1mA Run Current
鈥?/div>
1A Peak Gate Drive Output
鈥?/div>
Voltage Feed Forward
鈥?/div>
Programmable Duty Cycle Clamp
鈥?/div>
Optocoupler Interface
鈥?/div>
500kHz Operation
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Soft Start
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Fault Counting Shutdown
鈥?/div>
Fault Latch Off or Automatic Restart
DESCRIPTION
The UCC1570 family of pulse width modulators is intended for application
in isolated switching supplies using primary side control and a voltage
mode feedback loop. Made with a BiCMOS process, these devices feature
low startup current for efficient off-line starting with a bootstrapped low volt-
age supply. Operating current is also very low; yet these devices maintain
the ability to drive a power MOSFET gate at frequencies above 500kHz.
Voltage feedforward provides fast and accurate response to wide line volt-
age variation without the noise sensitivity of current mode control. Fast cur-
rent limiting is included with the ability to latch off after a programmable
number of repetitive faults has occurred. This allows the power supply to
ride through a temporary overload, while still shutting down in the event of
a permanent fault. Additional versatility is provided with a maximum duty
cycle clamp programmable within a 20% to 80% range and line voltage
sensing with a programmable window of allowable operation.
BLOCK DIAGRAM
FREQ
11
CLOCK
GENERATOR
CLK
RAMP
VALLEY
1V
VFWD
6
4.5V
10 I3
I3
S
RAMP
LATCH
R
10 I4
SLOPE
7
RAMP
10
1V
5V
GENERATOR
12
13
VREF
GND
15V
13/9V
ISET
9
I4
4V
HIGH
LINE
LOW
LINE
1V
FEEDBK
8
I4
SOFTST
14
PWM
S
R
D
PWM
LATCH
5
4
4V
RAMP
PEAK
3
VCC
OUT
PGND
CURLIM
2
0.2V
CURRENT
LIMIT
I4
S
D
CLK
COUNT
1
R
R
S
D
4V
SHUTDOWN
LATCH
SHUTDOWN
0.6V
04/99

UCC2570D 產(chǎn)品屬性

  • Texas Instruments

  • 電壓模式 PWM 控制器

  • Single Output

  • Boost, Flyback, Forward

  • 1000 mA

  • 500 KHz

  • 80 %

  • 15 V

  • + 85 C

  • - 40 C

  • SOIC-14

  • Tube

  • 20 ns

  • SMD/SMT

  • 20 ns

  • 1

  • No

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