參數(shù)資料
型號： UCC29422PWTR
廠商： Texas Instruments, Inc.
英文描述： Multimode High Frequency PWM Controller
中文描述： 多模高頻PWM控制器
文件頁數(shù)： 1/35頁
文件大小： 606K
代理商： UCC29422PWTR
SLUS246C OCTOBER 1999 REVISED FEBRUARY 2005
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Operation Down to an Input
Voltage of 1.8 V
High Efficiency Boost, SEPIC or
Flyback (Buck-Boost) Topologies
Drives External FETs for
High-Current Applications
Up to 2-MHz Oscillator
Synchronizable Fixed Frequency
Operation
High-Efficiency Low-Power Mode
High-Efficiency at Very Low-Power
with Programmable Variable
Frequency Mode
Pulse-by-Pulse Current Limit
5-
μ
A Supply Current in Shutdown
150-
μ
A Supply Current in Sleep
Mode
Selectable NMOS or PMOS
Rectification
Built-In Power-On Reset
(UCC39422 Only)
Built-In Low-Voltage Detect
(UCC39422 Only)
description
The UCC39421 family of synchronous
PWM controllers is optimized to operate
from dual alkaline/NiCd cells or a single
Lithium-Ion (Li-Ion) cell, and convert to
adjustable output voltages from 2.5 V to
8 V. For applications where the input
voltage does not exceed the output, a
standard boost configuration is used.
For other applications where the input voltage can swing above and below the output, a 1:1 coupled inductor
(Flyback or SEPIC) is used in place of the single inductor. Fixed frequency operation can be programmed, or
synchronized to an external clock source. In applications where (at light loads) variable frequency mode is
acceptable, the IC can be programmed to automatically enter PFM (pulse frequency modulation) mode for an
additional efficiency benefit.
Synchronous rectification provides excellent efficiency at high power levels, where N- or P- type MOSFETs can
be used. At lower power levels (between 10% and 20% of full load) where fixed frequency operation is required,
low power mode is entered. This mode optimizes efficiency by cutting back on the gate drive of the charging
FET. At very low power levels, the IC enters a variable frequency mode (PFM). PFM can be disabled by the user.
Copyright
2000, Texas Instruments Incorporated
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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.
simplified schematic block diagram and
application circuit
UDG98122
20
4
2
16
18
1
17
5
15
11
19
6
8
9
7
13
14
10
12
+
1.24 V
LOWBAT
+
200 mS
RESET/
POR
1.18 V
VDET
RSADJ
GND
UCC39422
ONLY
RESET
+
1.22V
PWM CIRCUITRY
CURRENT LIMIT
LOW POWER
MODE
SLOPE
COMPENSATION
PFM MODE
CONTROL
+
PFM
COMP
FB
ERROR
AMP
PGND
ISENSE
50 mV TYP
+
X10
ANTI
CROSS
COND.
CHRG
VPUMP
RSEL
RECT
CHARGE
PUMP
3
CP
VOUT
RSEN
VIN
VPUMP
+
+
2 CELL
ALKALINE/
NiCd OR
1 LIION
VOUT
RT
SYNC/SD
PWM
OSC
1.24 V
VREF
VGD
1.24 V
1.8 V(MIN)
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參數(shù)描述
UCC29422PWTRG4 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 High Freq Multimode Sync Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
UCC2946D 功能描述:監(jiān)控電路 Mcrprcsr Supervisor w/Watchdog Timer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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UCC2946DG4 功能描述:監(jiān)控電路 Mcrprcsr Supervisor w/Watchdog Timer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
UCC2946DTR 功能描述:監(jiān)控電路 Mcrprcsr Supervisor w/Watchdog Timer RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
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