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参数资料
| 型号： | MAX1964TEEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/30页 |
| 文件大小： | 0K |
| 描述： | IC POWER CTRLR/SEQUENCER 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 电源控制器，序列发生器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1.25mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
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Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
V SUP
MAX1964
MAX1965
B_
C BE
R BE
Q PASS
C BYP
R1
V POS
FB_
R2
C LDO
a) POSITIVE OUTPUT VOLTAGE
R4
V REF
BF5
R3
V NEG
B5
Q PASS
C NEG
MAX1965
C BE
R BE
V SUP
Figure 7. Base-Drive Noise Reduction
b) NEGATIVE OUTPUT VOLTAGE (MAX1965 ONLY)
C BYP
2 π ? POLE ( CBE ) ?
? ? - C IN ( Q )
C BE ≤
1 ? R BE I LOAD + V T h FE ?
R BE V T h FE ?
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
?
?
?
?
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:
determined by:
? V LDO ( NEG ) + V SAT + V DIODE ?
N NEG ≥ ? ?
V OUT
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-
N POS ≥ ?
-1 ?
? V LDO(POS) + V SAT + V DIODE
? V OUT
?
?
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
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1964TEEE+ | 功能描述:电流和电力监控器、调节器 Track/Seq Trpl/Wuint Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1964TEEE+T | 功能描述:电流和电力监控器、调节器 Track/Seq Trpl/Wuint Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1964TEEE-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1965TEEP | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1965TEEP-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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