参数资料
| 型号： | ISL6328ACRZ |
| 厂商： | Intersil |
| 文件页数： | 25/33页 |
| 文件大小： | 0K |
| 描述： | IC VOLTAGE REGULATOR |
| 标准包装： | 50 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页
ISL6328A
V IN
L
C OUT
In Equations 30 and 31, P Qg_Q1 is the total upper gate drive
power loss and P Qg_Q2 is the total lower gate drive power loss;
the gate charge (Q G1 and Q G2 ) is defined at the particular gate to
source drive voltage PVCC in the corresponding MOSFET data
sheet; I Q is the driver total quiescent current with no load at both
drive outputs; N Q1 and N Q2 are the number of upper and lower
MOSFETs per phase, respectively; N PHASE is the number of active
phases. The I Q* VCC product is the quiescent power of the
controller without capacitive load and is typically 75mW at
300kHz.
PVCC BOOT
Inductor DCR Current Sensing Component
Fine Tuning
I
n
UGATE(n)
L
MOSFET DCR V OUT
DRIVER LGATE(n) INDUCTOR
V L (s)
V C (s)
D
R 1
C
R HI1
UGATE
G
C GD
C DS
ISL6328A INTERNAL CIRCUIT
ISENn-
R 2
R LO1
R G1
R GI1
C GS
S
Q1
I n
+
-
ISENn+
V C (s)
R ISEN
PHASE
FIGURE 16. TYPICAL UPPER-GATE DRIVE TURN-ON PATH
I SEN
FIGURE 18. DCR SENSING CONFIGURATION
Due to errors in the inductance and/or DCR it may be necessary
PVCC
D
to adjust the value of R 1 and R 2 to match the time constants
correctly. The effects of time constant mismatch can be seen in
the form of droop overshoot or undershoot during the initial load
R HI2
R LO2
LGATE
G
R G2
C GD
R GI2
C GS
S
C DS
Q2
transient spike, as shown in Figure 19. Follow the steps below to
ensure the R-C and inductor L/DCR time constants are matched
accurately.
1. If the regulator is not utilizing droop, modify the circuit by
placing the frequency set resistor between FS and Ground for
the duration of this procedure.
2. Capture a transient event with the oscilloscope set to about
FIGURE 17. TYPICAL LOWER-GATE DRIVE TURN-ON PATH
The total gate drive power losses are dissipated among the resistive
components along the transition path and in the bootstrap diode. The
portion of the total power dissipated in the controller itself is the power
L/DCR/2 (sec/div). For example, with L = 1μH and
DCR = 1m Ω , set the oscilloscope to 500μs/div.
3. Record Δ V1 and Δ V2 as shown in Figure 19.
dissipated in the upper drive path resistance (P DR_UP ), the lower drive
path resistance (P DR_UP ), and in the boot strap diode (P BOOT ). The rest
of the power will be dissipated by the external gate resistors (R G1 and
R G2 ) and the internal gate resistors (R GI1 and R GI2 ) of the MOSFETs.
Figures 16 and 17 show the typical upper and lower gate drives turn-on
transition path. The total power dissipation in the controller itself, P DR ,
can be roughly estimated as:
Δ V 1
Δ V 2
V OUT
P DR = P DR_UP + P DR_LOW + P BOOT + ( I Q ? VCC )
P DR_UP = ? ----------------------------------- + ------------------------------------- ? ? -------------------
R HI1 + R EXT1 R LO1 + R EXT1 ?
?
P DR_LOW = ? ----------------------------------- + ------------------------------------- ? ? -------------------
R HI2 + R EXT2 R LO2 + R EXT2 ?
?
N Q2
N Q1
3
P Qg_Q1
P BOOT = -------------------
? R HI1 R LO1 ? P Qg_Q1
? R HI2 R LO2 ? P Qg_Q2
R GI1 R GI2
3
2
R EXT1 = R G1 + ------------ R EXT2 = R G2 + ------------
25
(EQ. 32)
I TRAN
Δ I
FIGURE 19. TIME CONSTANT MISMATCH BEHAVIOR
FN7986.0
April 6, 2012
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6566CRZR5184 | IC CTRLR PWM 3PHASE BUCK 40-QFN |
| ISL6566IRZAR5184 | IC CTRLR PWM 3PHASE BUCK 40-QFN |
| EBA40DTKN | CONN EDGECARD 80POS DIP .125 SLD |
| EBA40DTKH | CONN EDGECARD 80POS DIP .125 SLD |
| GCB35DHBS | CONN EDGECARD 70POS R/A .050 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6328ACRZ-T | 功能描述:IC VOLTAGE REGULATOR RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:* 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6328AIRZ | 功能描述:IC VOLTAGE REGULATOR RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:* 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6328AIRZ-T | 功能描述:IC VOLTAGE REGULATOR RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:* 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6328CRZ | 功能描述:IC CTRLR PWM SYNC BUCK DL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6328CRZ-T | 功能描述:IC CTRLR PWM SYNC BUCK DL 48QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。