- 您现在的位置：买卖IC网 > PDF目录69003 > L6598 (STMICROELECTRONICS) SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP16 PDF资料下载
参数资料
| 型号： | L6598 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 6/24页 |
| 文件大小： | 359K |
| 代理商： | L6598 |
Block diagram description
L6598
14/24
Doc ID 6554 Rev 7
The bootstrap driver introduces a voltage drop during the recharging of the capacitor Cboot
(i.e. when the low side driver is on), which increases with the frequency and with the size of
the external power MOS. It is the sum of the drop across the RDSON and of the diode
threshold voltage. At low frequency this drop is very small and can be neglected. Anyway
increasing the frequency it must be taken in to account. In fact the drop, reducing the
amplitude of the driving signal, can significantly increase the RDSON of the external power
MOS (and so the dissipation).
To be considered that in resonant power supplies the current which flows in the power MOS
decreases increasing the switching frequency and generally the increases of RDSON is not a
problem because power dissipation is negligible. The following equation is useful to
compute the drop on the bootstrap driver:
Equation 8
where Qg is the gate charge of the external power MOS, Rdson is the on resistance of the
bootstrap DMOS, and Tcharge is the time in which the bootstrap driver remains on (about the
semi-period of the switching frequency minus the dead time). The typical resistance value of
the bootstrap DMOS is 150
Ω. For example using a power MOS with a total gate charge of
30 nC the drop on the bootstrap driver is about 3 V, at a switching frequency of 200 kHz. In
fact:
Equation 9
To summaries, if a significant drop on the bootstrap driver (at high switching frequency when
large power MOS are used) represents a problem, an external diode can be used, avoiding
the drop on the RDSON of the DMOS.
5.4
Op amp section
The integrated op amp is designed to offer low output impedance, wide band, high input
impedance and wide common mode range. It can be readily used to implement protection
features or a closed loop control. For this purpose the op amp output can be properly
connected to Rfmin pin to adjust the oscillation frequency.
V
drop
I
ch
e
arg Rdson
V
diode
V
drop
→
+
Q
g
T
ch
e
arg
-------------------R
dson
V
diode
+
==
V
drop
30nC
2.23
μs
------------------150
Ω 0.6V 2.6V
+
=
相关PDF资料 |
PDF描述 |
|---|---|
| L6598D013TR | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16 |
| L6710 | 2 A SWITCHING CONTROLLER, PQFP44 |
| L6710TR | 2 A SWITCHING CONTROLLER, PQFP44 |
| L6713ATR | 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PQFP64 |
| L6716TR | DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6598_04 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH VOLTAGE RESONANT CONTROLLER |
| L6598D | 功能描述:PMIC 解决方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| L6598D013TR | 功能描述:PMIC 解决方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| L6598D016TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High voltage resonant controller |
| L6599 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:High-voltage resonant controller |
发布紧急采购，3分钟左右您将得到回复。