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參數(shù)資料
| 型號： | ISL6232 |
| 廠商： | Intersil Corporation |
| 英文描述： | Octal D-Type Transparent Latches With 3-State Outputs 20-SOIC -40 to 85 |
| 中文描述： | 高效率系統(tǒng)電源控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 746K |
| 代理商： | ISL6232 |
15
FN9116.0
April 18, 2005
drivers. The low side drivers are directly powered from LDO5
and the high side drivers are indirectly powered from LDO5
through the internal Schottky diode and external bootstrap
capacitor. Only after soft-start is finished and when OUT5 is
above 4.75V, an automatic switch-over circuit turns off the
internal LDO5 regulator and powers the device from OUT5.
This prevents the LDO5 and LDO3 from a voltage dip during
the switch-over. It switches back to LDO5 when OUT5 is
disabled for EN5 = 0. Similary, only after soft-start is finished
and when OUT3 is above 3.0V, it turns off the 3.3V LDO3
regulator and powers the device from OUT3. It switches
back to LDO3 just before OUT3 is disabled.
ISL6232 has internal soft-start to control the inrush current.
This soft-stop feature avoids negative output voltage for
undervoltage protection and overcurrent protection so that
the part can be shut down by first discharging OUT3 or
OUT5 through an internal 20
switch and damping the
inductor current. Finally, thermal shutdown is included in
ISL6232 to protect the part from over-heating.
PWM Controller
The two-buck controllers are nearly identical. The only
difference is the fixed output voltage, 3.3V versus 5V. Both
buck controllers use a peak current-mode PWM control
scheme. For peak current mode control, the system can be
unstable when the duty cycle is higher than 0.5. A slope
compensation signal is used to stabilize the system. A PWM
comparator compares the integrated voltage feedback signal
(COMP) with the sum of the amplified current-sense signal
and the slope-compensation ramp. At each rising edge of
the internal clock, the high side MOSFET turns on until the
PWM comparator trips. During this on-time, current ramps
up through the inductor, sourcing current to the output and
storing energy in the inductor. The current-mode feedback
system regulates the peak inductor current as a function of
BOOT
UGATE
LGATE
LDO5
CS
OUT
FB
OUT
PHASE
+
+
20
x16
+
+
OCP
1.0V
0.2V
SKIP
+
Cross
+
+
NCSA
x8
NOCP
CLK
UV
OV
+
+
+
+
Slope
Comp
DC
OFFSET
0.8V
EAMP
COMP
COMP
+
0.2V
+
0.72V
+
0.9V
OV
+
0.6V
UV
PGOOD
Blanking
SKIP#
CSA
0.06V
Zero
0.1V
PWM/SKIP
LOGIC
CONTROLLER
20ms
Soft
Start
FIGURE 31. SYNCHRONOUS BUCK PWM CONTROLLER BLOCK DIAGRAM
ISL6232
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| ISL6232CAZA-T | 功能描述:熱插拔功率分布 W/ANEAL HI EFF SYSTM PWR SUPPLY CONTR RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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