參數(shù)資料
型號(hào)： SP6137
英文描述： Wide Input, 900KHz Synchronous PWM Controller
中文描述： 寬輸入，900kHz的同步PWM控制器
文件頁(yè)數(shù)： 4/13頁(yè)
文件大?。?/td> 142K
代理商： SP6137
4
Date: 7/28/04 SP6137 Wide Input, 900KHz Synchronous PWM Controll Copyright 2004 Sipex Corporation
General Overview
The SP6137 is a fixed frequency, voltage mode,
synchronous PWM controller optimized for high
efficiency. The part has been designed to be
especially attractive for split plane applications
utilizing 5V to power the controller and 2.5V to
20V for step down conversion.
The heart of the SP6137 is a wide bandwidth
transconductance amplifier designed to accom-
modate Type II and Type III compensation
schemes. A precision 0.8V reference present on
the positive terminal of the error amplifier per-
mits the programming of the output voltage
down to 0.8V via the V
FB
pin. The output of the
error amplifier, COMP, compared to a 1.1V
peak-to-peak ramp is responsible for trailing
edge PWM control. This voltage ramp and PWM
control logic are governed by the internal oscil-
lator that accurately sets the PWM frequency to
900kHz.
FUNCTIONAL DIAGRAM
1.7 V
1.7 V
POWER OK ONCE LOGIC
COMPARATOR
0.4 V
THERMAL
FAULT
FAULT
CLR
CCLOCK
PULSES
600 kHZ
CLK
CLOCK PULSE GENERATOR
SS
GL HOLD OFF
100% Protection Logic
Q
R
S
RESET
DOMINANT
QPWM
CLK
SYNCHRONOUS
DRIVER
GND
3
2 GL
PWM LOOP
5 COMP
POS REF
FAULT
Logic
Delay
FAULT
UVIN
6
1
7
COUNTER
CLR
V
CC
UVLO
VIN UVLO
REF OK
4.05 V OFF
4.25 V ON
2.50 V ON
2.20 V OFF
UVLO COMPARATORS
REF OK
0.25V
VPOS
VFBINT
PWRFLT
0.8V
CORE
REFERENCE
V
CC
REF OK
THERMAL AND SHORT CIRCUIT PROTECTION
FAULT
Q
145
°
C ON
135
°
C OFF
REF OK
100ms Delay
CLK
MFLT
DSET
S
R
DSET
Q
R
S
SHDETECTION
SOFTSTART INPUT
RAMP = 1.1V
VFBINT
VPOS
Gm
Gm ERROR AMPLIFIER
9GH
8SWN
10BST
V
FB
SS
10
μ
A
V
CC
V
CC
V
CC
PWRFLT
MFLT
THEORY OF OPERATION
The SP6137 contains two unique control fea-
tures that are very powerful in distributed appli-
cations. First, asynchronous driver control is
enabled during start up to prohibit the low side
NFET from pulling down the output until the
high side NFET has attempted to turn on. Sec-
ond, a 100% duty cycle timeout ensures that the
low side NFET is periodically enhanced during
extended periods at 100% duty cycle. This guar-
antees the synchronized refreshing of the BST
capacitor during very large duty ratios.
The SP6137 also contains a number of valuable
protection features. A programmable input (V
IN
)
UVLO allows a user to set the exact value at
which the conversion voltage is at a safe point to
begin down conversion, and an internal V
CC
UVLO ensures that the controller itself has
enough voltage to properly operate. Other pro-
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP6137CU 制造商:Exar Corporation 功能描述:SMPS Controller
SP6137CU/TR 制造商:Exar Corporation 功能描述:SMPS Controller
SP6137CU-L 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Wide Input, 900KHz Synchronous 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(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
SP6137CU-L/TR 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 Wide Input, 900KHz Synchronous 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(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
SP6137EU 制造商:Exar Corporation 功能描述:SMPS Controller
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