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參數(shù)資料
| 型號(hào)： | MAX1965TEEP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Tracking/Sequencing Triple/Quintuple Power-Supply Controllers |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-20 |
| 文件頁(yè)數(shù)： | 24/30頁(yè) |
| 文件大小： | 475K |
| 代理商： | MAX1965TEEP |
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M
where C
IN(Q)
is the transistor
’
s input capacitance, and
f
POLE(CBE)
is the second pole required for stability.
Transformer Selection
In systems where the step-down controller
’
s output is
not the highest voltage, a transformer may be used to
provide additional post-regulated, high-voltage outputs.
The transformer generates unregulated, high-voltage
supplies which power the positive and negative linear
regulators. These unregulated supply voltages are
dependent on the transformer
’
s turns ratio
–
number of
secondary turns (N
S
) divided by the number of primary
turns (N
P
). So the transformer must be selected to pro-
vide supply voltages high enough to keep the pass
transistors from saturating. For positive output voltages,
connect the transformer as shown in Figure 6 where the
minimum turns ratio (N
POS
= N
S(POS)
/N
P
) is determined
by:
where V
SAT
is the pass transistor
’
s saturation voltage
under full load. For negative output voltages (MAX1965
only), connect the transformer as shown in Figure 6
where the minimum turns ratio (N
NEG
= N
S(NEG)
/N
P
) is
determined by:
Since power transfer occurs when the low-side MOS-
FET is on (DL = high), the transformer cannot support
heavy loads with high duty cycles.
Snubber Design
The MAX1964/MAX1965 use current-mode control
schemes that sense the current across the high-side
MOSFET (N
H
). Immediately after the high-side MOSFET
turns on, the MAX1964/MAX1965 use a 60ns current-
sense blanking period to minimize noise sensitivity.
However, when the MOSFET turns on, the transformer
’
s
secondary inductance and the diode
’
s parasitic capac-
itance form a resonant circuit that causes ringing.
Reflected back through the transformer to the primary
side, these oscillations appear across the high-side
MOSFET may last longer than the blanking period. As
N
V
V
V
V
NEG
LDO NEG
(
SAT
DIODE
OUT
≥
+
+
)
N
V
V
V
V
POS
LDO POS
(
SAT
DIODE
OUT
≥
+
+
)
-1
C
R
R
V h
C
BE
POLE CBE
BELOAD
BE T FE
I( )
≤
+
1
2
π
(
)
-
Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
24
______________________________________________________________________________________
Figure 7. Base-Drive Noise Reduction
C
BYP
V
NEG
V
SUP
Q
PASS
C
LDO
R
BE
C
BE
R1
R2
B_
a) POSITIVE OUTPUT VOLTAGE
b) NEGATIVE OUTPUT VOLTAGE (MAX1965 ONLY)
FB_
MAX1964
MAX1965
V
POS
C
BYP
V
REF
V
SUP
Q
PASS
C
NEG
R
BE
C
BE
R4
R3
BF5
B5
MAX1965
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1966 | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1967EUB | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1966-MAX1967 | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX1966ESA | Low-Cost Voltage-Mode PWM Step-Down Controllers |
| MAX2003 | NiCd/NiMH Battery Fast-Charge Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1965TEEP-T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1966ESA | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1966ESA+ | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1966ESA+T | 功能描述:電壓模式 PWM 控制器 Voltage-Mode PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MAX1966ESA-T | 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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