參數(shù)資料
型號(hào)： ISL6559CB-T
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Multi-Phase PWM Controller
中文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28
封裝： PLASTIC, MS-013-AE, SOIC-28
文件頁(yè)數(shù)： 12/21頁(yè)
文件大?。?/td> 606K
代理商： ISL6559CB-T
12
FN9084.8
December 29, 2004
Following the delay, the soft start ramps linearly until V
RAMP
reaches VID. For the system described above, this first linear
ramp will continue for approximately
The final portion of the soft-start sequence is the time
remaining after V
RAMP
reaches VID and before I
RAMP
gets to
zero. This is also characterized by a slight change in the slope
of the output voltage ramp which, for the current example,
exists for a time of
This behavior is seen in the example in Figure 9 of a converter
switching at 500kHz. For this converter, R
FB
is set to 2.67k
leading to T
SS
= 4.0ms, t
DELAY
= 700ns, t
RAMP1
= 2.23ms,
and t
RAMP2
= 1.17ms.
NOTE: Switching frequency 500kHz and R
FB
= 2.67k
Fault Monitoring and Protection
The ISL6559 actively monitors voltage and current feedback
to detect fault conditions. Fault monitors trigger protective
measures to prevent damage to a microprocessor load. One
common power good indication signal is provided for linking
to external system monitors. The schematic in Figure 10
outlines the interaction between the fault monitors and the
power good signal.
Power Good Signal
The power good pin (PGOOD) is an open-drain logic output
which indicates that the converter is operating properly and
the output voltage is within a set window. The under-voltage
(UV) and over-voltage (OV) comparators create the output
voltage window. The controller also takes advantage of
current feedback to detect output over-current (OC)
conditions. PGOOD pulls low during shutdown and releases
high during soft-start once the output voltage exceeds the
UV threshold. Once high, PGOOD will only transition low
when the controller is disabled or a fault condition is
detected. It will return high under certain circumstances
once a fault clears.
Under-Voltage Protection
The voltage on V
DIFF
is internally offset by 350mV before it
is compared with the DAC reference voltage. By positively
offsetting the output voltage, an UV threshold is created
which moves relative to the VID code. During soft-start, the
slow rising output voltage eventually exceeds the UV
threshold. Assuming the POR leg of the PGOOD NOR gate
has not detected an OC fault, the PGOOD signal will go
high.
If a fault condition arises during operation and the output
voltage drops below the UV threshold, PGOOD will
immediately pull low, but converter operation will continue.
PGOOD will return high once the output voltage surpasses
the UV threshold.
If the ISL6559 is disabled during operation, the PGOOD
signal will not pull low until the output voltage decays below
the UV threshold.
t
DELAY
T
R
FB
160
1
10
6
–
×
--------1.4 VID
+
--------------------------------------------------
560
μ
s
=
=
(EQ. 10)
RAMP1
T
1.4
t
DELAY
–
=
5.27ms
=
(EQ. 11
t
RAMP2
T
SS
t
RAMP1
–
t
DELAY
–
=
2.34ms
=
(EQ. 12)
FIGURE 9. SOFT-START WAVEFORMS FOR ISL6559 BASED
MULTI-PHASE BUCK CONVERTER
1ms/DIV
EN, 5V/DIV
VOUT, 500mV/DIV
t
DELAY
t
RAMP1
t
RAMP2
FIGURE 10. POWER GOOD AND PROTECTION CIRCUITRY
OVP
POR
CIRCUIT
-
+
2.2V
VDIFF
-
+
90
μ
A
I
AVG
-
+
DAC
REFERENCE
OV
OC
UV
350mV
-
PGOOD
+
ISL6559
相關(guān)PDF資料
PDF描述
ISL6559CR-T Multi-Phase PWM Controller
ISL6559CRZ Multi-Phase PWM Controller
ISL6559CRZ-T Multi-Phase PWM Controller
ISL6559 Multi-Phase PWM Controller
ISL6559CB Multi-Phase PWM Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISL6559CBZ 功能描述:電流型 PWM 控制器 2 TO 4 PHS BUCK CNTRLR 2 8LD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
ISL6559CBZ-T 功能描述:電流型 PWM 控制器 2 TO 4 PHS BUCK CNTRLR 2 8LD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
ISL6559CR 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6559CR-T 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6559CRZ 功能描述:電流型 PWM 控制器 2 TO 4 PHS BUCK CNTRLR 32L 5X5 MLFP RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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