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參數(shù)資料
| 型號(hào)： | DS2148TN |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Digital Transmission Interface |
| 英文描述： | DATACOM, PCM TRANSCEIVER, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 603K |
| 代理商： | DS2148TN |
MAX8625A
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
10
______________________________________________________________________________________
shuttling current in and out of the output capacitor. If
SKIP is asserted high for forced-PWM mode, phase 4 is
not entered and current shuttling is allowed (and is
necessary to maintain the PWM operation frequency
when no load is present).
Step-Up Operation (VIN < VOUT)
During medium and heavy loads when VIN < VOUT,
MOSFETs P1 and N2 turn on at the clock edge to ramp
up the inductor current. Phase 1 terminates when the
inductor current reaches the peak target current set by
the PWM comparator and N2 turns off. This is followed
by a slow-discharge phase (phase 2) instead of a
charge phase (since VIN is less than VOUT) when P2
turns on. The slow-discharge phase terminates on a
clock edge. The converter now enters the fast-dis-
charge phase (phase 3). During phase 3, P1 turns off
and N1 turns on. At the end of the minimum time, both
P2 and N1 turn off and the cycle repeats.
If SKIP is asserted low, during light loads when inductor
current falls to zero in phase 3, the converter switches to
phase 4 (hold) to reduce power consumption and avoid
shuttling current in and out of the output. If SKIP is high
to assert forced-PWM mode, the converter never enters
phase 4 and allows negative inductor current.
Step-Up/Down Transition-Zone Operation
(VIN = VOUT)
When VIN = VOUT, the converter still goes through the
three phases for moderate to heavy loads. However,
the maximum time is now spent in phase 2 where
inductor current di/dt is almost zero, since it is propor-
tional to (VIN - VOUT). This eliminates transition glitches
Figure 2. State Diagram
FAULT
TIMEOUT
(ASYNCHRONOUS
FROM ANYWHERE)
ERROR
ON = 1
P1, P2 = OFF
N1, N2 = ON
OFF
ON = 0
P1, P2 = OFF
N1, N2 = ON
IQ = 0
A
ON = 0
(ASYNCHRONOUS
FROM
ANYWHERE)
REFOK = 0 OR
UVLO = 0
(ASYNCHRONOUS
FROM ANYWHERE)
PHASE 2
SLOW CHARGE/
DISCHARGE
OSC = ON
P1, P2 = ON
N1, N2 = OFF
PHASE 3
FAST DISCHARGE
OSC = ON
P2, N1 = ON
P1, N2 = OFF
PHASE 1
FAST-CHARGE
OSC = ON
P1, N2 = ON
P2, N1 = OFF
PHASE 4
HOLD
OSC = OFF
N1, N2 = ON
P1, P2 = OFF
POWER-UP
ON = 1, P1, P2 = OFF, N1, N2 = ON,
OSC = ON AND REF = ON IF UVLO OK
T2-3
T3-4
T1-2
T3-1
T1-3
T4-1
TRUN
TPUP
(SKIP)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS2148T | DATACOM, PCM TRANSCEIVER, PQFP44 |
| DS2151QNB | DATACOM, FRAMER, PQCC44 |
| DS2151QB | DATACOM, FRAMER, PQCC44 |
| DS2152LN | DATACOM, FRAMER, PQFP100 |
| DS2152L | DATACOM, FRAMER, PQFP100 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2148TN+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 5V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2148TNB | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2148TNC | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2148TN-W | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2149 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V T1/J1 Line Interface Unit |
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