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參數(shù)資料
| 型號： | ISL6553CB |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM Controller with Wide Input Range 8-PDIP -25 to 85 |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, MS-012-AC, SOIC-16 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大小： | 182K |
| 代理商： | ISL6553CB |
6
Operation
Figure 1 shows a simplified diagram of the voltage regulation
and current control loops. Both voltage and current feedback
are used to precisely regulate voltage and tightly control
output currents, I
L1
and I
L2
, of the two power channels. The
voltage loop comprises the Error Amplifier, Comparators,
gate drivers and output MOSFETs. The Error Amplifier is
essentially connected as a voltage follower that has as an
input, the Programmable Reference DAC and an output that
is the CORE voltage.
Voltage Loop
Feedback from the CORE voltage is applied via resistor R
IN
to the inverting input of the error amplifier. This signal can
drive the error amplifier output either high or low, depending
upon the CORE voltage. Low CORE voltage makes the
amplifier output move towards a higher output voltage level.
Amplifier output voltage is applied to the positive inputs of
the comparators via the correction summing networks. Out-
of-phase sawtooth signals are applied to the two
comparators inverting inputs. Increasing error amplifier
voltage results in increased comparator output duty cycle.
This increased duty cycle signal is passed through the PWM
circuit with no phase reversal and on to the HIP6601, again
with no phase reversal for gate drive to the upper MOSFETs,
Q1 and Q3. Increased duty cycle or ON time for the
MOSFET transistors results in increased output voltage to
compensate for the low output voltage sensed.
Current Loop
The current control loop works in a similar fashion to the
voltage control loop, but with current control information
applied individually to each channel’s comparator. The
information used for this control is the voltage that is
developed across r
DS(ON)
of each lower MOSFET, Q2 and
Q4, when they are conducting. A single resistor converts
and scales the voltage across the MOSFETs to a current
that is applied to the current sensing circuit within the
ISL6553. Output from these sensing circuits is applied to the
current averaging circuit. Each PWM channel receives the
difference current signal from the summing circuit that
compares the average sensed current to the individual
channel current. When a power channel’s current is greater
FIGURE 1. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6553 VOLTAGE AND CURRENT CONTROL LOOPS FOR A TWO POWER
CHANNEL REGULATOR
CURRENT
SENSING
COMPARATOR
-
PWM
CIRCUIT
+
R
ISEN1
+
CORRECTION
ERROR
AMPLIFIER
FB
REFERENCE
DAC
ISEN1
R
IN
V
CORE
Q3
Q4
L2
PHASE
PWM1
I
L2
ISL6553
C
OUT
R
LOAD
V
IN
HIP6601
-
Q1
Q2
L1
PHASE
I
L1
V
IN
HIP6601
CURRENT
SENSING
COMPARATOR
PWM
CIRCUIT
CORRECTION
PWM2
-
I AVERAGE
+
+
+
-
PROGRAMMABLE
R
ISEN2
ISEN2
-
-
-
+
+
CURRENT
AVERAGING
∑
∑
∑
∑
ISL6553
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| ISL6553CB-T | 功能描述:IC REG CTRLR BUCK PWM 16-SOIC 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) |
| ISL6553CBZ | 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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) |
| ISL6553CBZA | 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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) |
| ISL6553CBZA-T | 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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) |
| ISL6553CBZ-T | 功能描述:IC REG CTRLR BUCK PWM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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) |
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