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| 型号： | UCC2891PW |
| 厂商： | Texas Instruments |
| 文件页数： | 7/41页 |
| 文件大小： | 0K |
| 描述： | IC PWM CNTRLR CLAMP P-CH 16TSSOP |
| 产品培训模块： | 120V High-Side/Low-Side MOSFET Driver (UCC27200) |
| 标准包装： | 90 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 73% |
| 电源电压： | 8.5 V ~ 16 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 管件 |
| 其它名称： | 296-17240 296-17240-5 296-17240-ND |
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UCC2891, UCC2892
UCC2893, UCC2894
SLUS542F ? OCTOBER 2003 ? REVISED JULY 2009
TERMINAL FUNCTIONS
TERMINAL
NAME
UCC2891
UCC2893
UCC2892
UCC2894
I/O
DESCRIPTION
This output drives the auxiliary clamp MOSFET which is turned on when the main PWM
AUX
12
12
O
switching device is turned off. The AUX pin can directly drive the auxiliary switch with 2-A
source turn-on current and 2-A sink turn-off current.
This pin is used to sense the peak current utilized for current mode control and for current
CS
7
7
I
limiting functions. The peak signal which can be applied to this pin before pulse-by-pulse
current limiting activates is approximately 0.75 V for the UCC2891 and UCC2893 and 1.27 V
for the UCC2892 and UCC2894.
This pin is used to bring the error signal from an external optocoupler or error amplifier into
FB
9
9
I
the PWM control circuitry. Often, there is a resistor tied from FB to VREF, and an optocoup-
ler is used to pull the control pin closer to GND to reduce the pulse width of the OUT output
driving the main power switch of the converter.
GND
LINEOV
6
?
6
16
?
I
This pin serves as the fundamental analog ground for the PWM control circuitry. This pin
should be connected to PGND directly at the device.
For the UCC2892/4, provides the LINE overvoltage function.
This pin provides a means to accurately enable/disable the power converter stage by moni-
toring the bulk input voltage or another parameter. When the circuit initially starts (or restarts
LINEUV
15
15
I
from a disabled condition), a rising input on LINEUV enables the outputs when the threshold
of 1.27 V is crossed. After the circuit is enabled, then a falling LINEUV signal disables the
outputs when the same threshold is reached. The hysteresis between the two levels is pro-
grammed using an internal current source.
This output pin drives the main PWM switching element MOSFET in an active clamp control-
OUT
13
13
O
ler. It can directly drive an N-channel device with 2-A source turn-on current and 2-A sink
turn-off current. A 10?k ? resistor is recommended to connect this pin to PGND.
The PGND should serve as the current return for the high-current output drivers OUT and
PGND
11
11
?
AUX. Ideally, the current path from the outputs to the switching devices, and back would be
as short as possible, and enclose a minimal loop area.
RSLOPE
RTDEL
RTOFF
RTON
SS/SD
8
1
3
2
10
8
1
3
2
10
I
I
I
I
I
A resistor connected from this pin to GND programs an internal current source that sets the
slope compensation ramp for the current mode control circuitry.
A resistor from this pin to GND programs the turn-on delay of the two gate drive outputs to
accommodate the resonant transitions of the active clamp power converter.
A resistor connected from this pin to GND programs an internal current source that dis-
charges the internal timing capacitor.
A resistor connected from this pin to GND programs an internal current source that charges
the internal timing capacitor.
A capacitor from SS/SD to ground is charged by an internal current source of IRTON to pro-
gram the soft-start interval for the controller. During a fault condition this capacitor is dis-
charged by a current source equal to IRTON.
The SYNC pin serves as a unidirectional synchronization input for the internal oscillator. The
SYNC
5
5
I
synchronization function is implemented such that the user programmable maximum duty
cycle (set by RTON and RTOFF) remains accurate during synchronized operation.
VDD
14
14
I
This is the power supply for the device. There should be a 1- μ F capacitor directly from VDD
to PGND. The capacitor value should be minimum 10 times greater than that on VREF.
PGND and GND should be connected externally and directly from PGND to GND.
For the UCC2891 and UCC2893, this pin is connected to the input power rail directly. Inside
VIN
16
?
I
the device, a high-voltage start-up device is utilized to provide the start-up current for the
controller until a bootstrap type bias rail becomes available.
This is the 5-V reference voltage that can be utilized for an external load of up to 5 mA.
VREF
4
4
O
Since this reference provides the supply rail for internal logic, it should be bypassed to
AGND as close as possible to the device. The VREF bias profile may not be monotonic
before VDD reached 5 V.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UCC2891PWG4 | 功能描述:电流型 PWM 控制器 Current Mode Active Clamp RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UCC2891PWR | 功能描述:电流型 PWM 控制器 Current Mode Active Clamp RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UCC2891PWRG4 | 功能描述:电流型 PWM 控制器 Current Mode Active Clamp RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UCC2892D | 功能描述:电流型 PWM 控制器 UCC289x Current Mode Active Clamp RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UCC2892DG4 | 功能描述:电流型 PWM 控制器 UCC289x Current Mode Active Clamp RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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