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參數(shù)資料
| 型號： | ISL6269 |
| 廠商： | Intersil Corporation |
| 英文描述： | Single Phase PWM Controller for Mobile Graphical Processing Unit (GPU) |
| 中文描述： | 單相PWM控制器，移動圖形處理單元（GPU） |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 395K |
| 代理商： | ISL6269 |
9
FN9177.0
June 14, 2005
Theory of Operation
Modulator
The ISL6269 is a hybrid of fixed frequency PWM control, and
variable frequency hysteretic control. The term “Ripple” in
the name “Robust-Ripple-Regulator” refers to the converter
output inductor ripple current, not the converter output ripple
voltage. The output voltage is regulated to 600mV at the FB
pin with respect to the GND pin. The FB pin is the inverting
input of the error amplifier. The frequency response of the
feedback control loop is tuned with a type-two compensation
network connected across the FB pin and COMP pin.
The R
3
modulator synthesizes an AC signal V
R
, which is an
ideal representation of the output inductor ripple current. The
duty-cycle of V
R
is derived from the voltage measured at the
VIN pin and VO pin with respect to the GND pin.
Transconductance amplifiers convert the VIN and VO
voltages into currents that charge and discharge the ripple
capacitor C
R
. The positive slope of V
R
can be written as:
V
RPOS
gm
V
IN
V
O
–
=
The negative slope of V
R
can be written as:
V
RNEG
gm V
O
=
A voltage V
W
is referenced with respect to the error amplifier
output voltage V
COMP
, creating a window-voltage envelope
into which voltage V
R
is compared. The V
R,
V
COMP,
and V
W
signals feed into a hysteretic window comparator in which
V
COMP
is the lower threshold voltage and V
W
is the higher
threshold voltage. PWM pulses are generated as V
R
traverses the V
W
and V
COMP
thresholds. The charging and
discharging rates of capacitor C
R
determine the PWM
switching frequency for a given amplitude of V
W
with respect
to V
COMP
. The R
3
regulator simultaneously affects switching
frequency and duty cycle because it modulates both edges
of the PWM pulses.
(
)
(
)
(EQ. 1)
(EQ. 2)
FIGURE 3. MODULATOR WAVEFORMS DURING LOAD TRANSIENT
μs
V
RIPPLE CAPACITOR VOLTAGE C
R
PWM
ERROR AMPLIFIER VOLTAGE V
COMP
WINDOW VOLTAGE V
W
ISL6269
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6269_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High-Performance Notebook PWM Controller with Bias Regulator and Audio-Frequency Clamp |
| ISL6269A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:High-Performance Notebook PWM Controller |
| ISL6269ACRZ | 功能描述:IC REG CTRLR BUCK PWM 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:Robust Ripple Regulator™ (R³) 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6269ACRZ-T | 功能描述:IC REG CTRLR BUCK PWM 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:Robust Ripple Regulator™ (R³) 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:275kHz 占空比:50% 電源電壓:18 V ~ 110 V 降壓:無 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:-40°C ~ 85°C 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) |
| ISL6269ACRZ-TR5453 | 制造商:Intersil Corporation 功能描述:STD. ISL6269ACRZ-T WITH GOLD BOND WIRE ONLY, T&R - Tape and Reel |
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