首页 > 产品中心 > 电源管理芯片 > DC-DC转换器 > 单相定时同步的PWM控制器CXSD62102驱动N通道mosfet瞬态响应和准确的直流电压以PFM或PWM模式输出

单相定时同步的PWM控制器CXSD62102驱动N通道mosfet瞬态响应和准确的直流电压以PFM或PWM模式输出

产品型号：	CXSD62102
产品类型：	DC-DC转换器
产品系列：	Buck降压型芯片
产品状态：	量产
浏览次数：	43 次

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产品简介

CXSD62102提供出色的瞬态响应和准确的直流电压以PFM或PWM模式输出。在脉冲频率模式（PFM）中，CXSD62102在轻到重负载的负载下提供非常高的效率-调制开关频率。在脉宽调制模式下，转换器几乎在用于低噪声要求的恒定频率

技术参数

输入电压范围 (VIN)	≤ 1.8~28V
输出电压 (VOUT)	ADJV
输出电流 (IOUT)	30A
工作频率	1500 Hz
转换效率	95%%
封装类型	TQFN3x3-16
Topology	Buck COT降压型芯片
Control method	No. of PWM Outputs:1
Switching frequency	1500
Protection	Phase: 1
Features	静态工作电流 Quiescent Current (typ)(uA):600
Application	Bias Voltage (typ) (V):5
Operating temp	-40℃~125℃
Reference design	反馈电压Reference Voltage(V):0.6

产品详细介绍

1.产品概述         2.产品特点
3.应用范围       4.下载产品资料PDF文档
5.产品封装图                     6.电路原理图
7.功能概述       8.相关产品

一,产品概述(General Description)
The CXSD62102 is a single-phase, constant on-time, synchronous PWM
controller, which drives N-channel MOSFETs. The CXSD62102 steps down high
voltage to generate low-voltage chipset or RAM supplies in notebook computers.
The CXSD62102 provides excellent transient response and accurate DC voltage
output in either PFM or PWM Mode.In Pulse Frequency Mode (PFM), theCXSD62102 provides very high efficiency over light to heavy loads with loading-
modulated switching frequencies. In PWM Mode, the converter works nearly at
constant frequency for low-noise requirements. CXSD62102 is built in remote
sense function for applications that require remote sense.The CXSD62102 is
equipped with accurate positive current limit, output under-voltage, and output
over-voltage protections, perfect for NB applications. The Power-On-Reset
function monitors the voltage on VCC to prevent wrong operation during
power-on. The CXSD62102 has a 1ms digital soft start and built-in an integrated
output discharge device for soft stop. An internal integrated soft-start ramps up
the output voltage with programmable slew rate to reduce the start-up current.
A soft-stop function actively discharges the output capacitors.
The CXSD62102 is available in 16pin TQFN3x3-16 package respectively.
二.产品特点(Features)
1.)Adjustable Output Voltage from +0.6V to +3.3V
- 0.6V Reference Voltage
- ±0.6% Accuracy Over-Temperature
2.)Operates from An Input Battery Voltage Range of +1.8V to +28V
3.)Remote Feedback Sense for Excellent Output Voltage
4.)REFIN Function for Over-clocking Purpose from 0.5V~2.5V range
5.)Power-On-Reset Monitoring on VCC pin
6.)Excellent line and load transient responses
7.)PFM mode for increased light load efficiency
8.)Programmable PWM Frequency from 100kHz to 500kHz
9.)Selectable Forced PWM or automatic PFM/PWM mode
10.)Built in 30A Output current driving capabilityIntegrate MOSFET Drivers
11.)Integrated Bootstrap Forward P-CH MOSFET
12.)Adjustable Integrated Soft-Start and Soft-Stop Power Good Monitoring
13.)70% Under-Voltage Protection
14.)125% Over-Voltage Protection TQFN3x3-16 Package
15.)Lead Free and Green Devices Available
三,应用范围 (Applications)
Notebook
Table PC
Hand-Held Portable
AIO PC
四.下载产品资料PDF文档

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五,产品封装图 (Package)

六.电路原理图

七,功能概述

Input Capacitor Selection (Cont.)
higher than the maximum input voltage. The maximum RMS current rating requirement is approximately IOUT/2,where IOUT is the load current. During power-up, the input capacitors have to handle great amount of surge current.For low-duty notebook appliactions, ceramic capacitor is recommended. The capacitors must be connected be-tween the drain of high-side MOSFET and the source of low-side MOSFET with very low-impeadance PCB layout.
MOSFET Selection
The application for a notebook battery with a maximum voltage of 24V, at least a minimum 30V MOSFETs should
be used. The design has to trade off the gate charge with the RDS(ON) of the MOSFET:For the low-side MOSFET, before it is turned on, the body diode has been conducting. The low-side MOSFET driver will not charge the miller capacitor of this MOSFET.
In the turning off process of the low-side MOSFET, the load current will shift to the body diode first. The high dv/dt of the phase node voltage will charge the miller capaci-tor through the low-side MOSFET driver sinking current path. This results in much less switching
loss of the low-side MOSFETs. The duty cycle is often very small in high battery voltage applications, and the low-side MOSFET will conduct most of the switching cycle; therefore, when using smaller RDS(ON) of the low-side MOSFET, the con-verter can reduce power loss. The gate charge for this MOSFET is usually the secondary consideration. The high-side MOSFET does not have this zero voltage switch-ing condition; in addition, it conducts for less time com-pared to the low-side MOSFET, so the switching loss tends to be dominant. Priority should be given to the MOSFETs with less gate charge, so that both the gate driver loss and switching loss will be minimized.
The selection of the N-channel power MOSFETs are determined by the R DS(ON), reversing transfer capaci-tance (CRSS) and maximum output current requirement.The losses in the MOSFETs have two components:
conduction loss and transition loss. For the high-side and low-side MOSFETs, the losses are approximately
given by the following equations:
Phigh-side = IOUT (1+ TC)(RDS(ON))D + (0.5)( IOUT)(VIN)( tSW)FSW
Plow-side = IOUT (1+ TC)(RDS(ON))(1-D) is the load current TC is the temperature dependency of RDS(ON)
FSW is the switching frequency tSW is the switching interval D is the duty cycleNote that both MOSFETs have conduction losses while the high-side MOSFET includes an additional transition loss.The switching interval, tSW, is the function of the reverse transfer capacitance CRSS. The (1+TC) term is a factor in the temperature dependency of the RDS(ON) and can be extracted from the “RDS(ON) vs. Temperature” curve of the power MOSFET.
Layout Consideration
In any high switching frequency converter, a correct layout is important to ensure proper operation of the regulator.
With power devices switching at higher frequency, the resulting current transient will cause voltage spike across
the interconnecting impedance and parasitic circuit elements. As an example, consider the turn-off transition
of the PWM MOSFET. Before turn-off condition, the MOSFET is carrying the full load current. During turn-off,
current stops flowing in the MOSFET and is freewheeling by the low side MOSFET and parasitic diode. Any parasitic
inductance of the circuit generates a large voltage spike during the switching interval. In general, using short and
wide printed circuit traces should minimize interconnect-ing impedances and the magnitude of voltage spike.
Besides, signal and power grounds are to be kept sepa-rating and finally combined using ground plane construc-
tion or single point grounding. The best tie-point between the signal ground and the power ground is at the nega-
tive side of the output capacitor on each channel, where there is less noise. Noisy traces beneath the IC are not

八,相关产品 更多同类产品......

Switching Regulator > Buck Controller
Part_No	Package	Archi tectu	Phase	No.of PWM Output	Output Current (A)	Input Voltage (V)		Reference Voltage (V)	Bias Voltage (V)	Quiescent Current (uA)
Part_No	Package	Archi tectu	Phase	No.of PWM Output	Output Current (A)	min	max	Reference Voltage (V)	Bias Voltage (V)	Quiescent Current (uA)
CXSD6273	SOP-14 QSOP-16 QFN4x4-16	VM	1	1	30	2.9	13.2	0.9	12	8000
CXSD6274	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6274C	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6275	QFN4x4-24	VM	2	1	60	3.1	13.2	0.6	12	5000
CXSD6276	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6276A	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6277/A/B	SOP8\|TSSOP8	VM	1	1	5	5	13.2	1.25\|0.8	5~12	3000
CXSD6278	SOP-8	VM	1	1	10	3.3	5.5	0.8	5	2100
CXSD6279B	SOP-14	VM	1	1	10	5	13.2	0.8	12	2000
CXSD6280	TSSOP-24 \|QFN5x5-32	VM	1	2	20	5	13.2	0.6	5~12	4000
CXSD6281N	SOP14 QSOP16 QFN-16	VM	1	1	30	2.9	13.2	0.9	12	4000
CXSD6282	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6282A	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6283	SOP-14	VM	1	1	25	2.2	13.2	0.8	12	5000
CXSD6284/A	LQFP7x7 48 TQFN7x7-48	VM	1	6	0.015	1.4	6.5	-	5	1800
CXSD6285	TSSOP-24P	VM	1	2	20	2.97	5.5	0.8	5~12	5000
CXSD6286	SOP-14	VM	1	1	10	5	13.2	0.8	12	3000
CXSD6287	SOP-8-P\|DIP-8	VM	1	1	30	2.9	13.2	1.2	12	3000
CXSD6288	SSOP28 QFN4x4-24	VM	1	2	20	5	24	0.9	5	1200
CXSD6289	SOP-20	VM	1	2	20	2.2	13.2	0.6	5~12	4000
CXSD6290	SOP8\|DFN3x3-10	VM	1	2	-	-	-	-	5~12	550
CXSD6291HC	DIP8\|SOP-8	VM	1	1	1	1.2	9	24	5	9 ~ 24
CXSD6292	SSOP16 QFN4x4-16 TQFN3x3-16	VM	1	1	25	3	25	0.6	5	1700
CXSD6293	TDFN3x3-10	COT	1	1	25	3	25	0.5	5	350
CXSD6294	QFN4x4-24	CM	2	1	40	4.5	13.2	0.6	5~12	4000
CXSD6295	SOP8P TDFN3x3-10	VM	1	1	20	3	13.2	0.8	5~12	2500
CXSD6296A\|B\|C\|D	SOP8P	VM	1	1	25	3	13.2	0.6\|0.8	5~12	1200
CXSD6297	TDFN3x3-10	VM	1	1	25	4	13.2	0.8	5~12	2000
CXSD6298	TDFN3x3-10	COT	1	1	25	4.5	25	0.6	5~12	80
CXSD6299\|A	SOP-8P	VM	1	1	25	4.5	13.2	0.8	5~12	16000
CXSD62100	TQFN3x3-10	VM	1	1	25	4.5	13.2	0.6	5~12	2500
CXSD62101\|L	TDFN3x3-10	COT	1	1	30	3	25	0.8	5~12	2000
CXSD62102	TQFN3x3-16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62102A	TQFN 3x3 16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62103	QFN4x4-24	VM	2	1	50	4.5	13.2	0.6	5~12	5000
CXSD62104	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62105	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62106\|A	TQFN4x4-4 TQFN3x3-20	COT	1	2	20	3	28	0.75	5	800
CXSD62107	TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62108	QFN3.5x3.5-14 TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62109	TQFN3x3-16	COT	1	2	20	1.8	28	0.75	5	400
CXSD62110	QFN3x3-20 TQFN3x3-16	COT	1	2	20	3	28	1.8\|1.5\|0.5	5	740
CXSD62111	TQFN4x4-24 \|QFN3x3-20	CM	1	2	15	5	28	0.5	N	3000
CXSD62112	TDFN3x3-10	COT	1	1	20	1.8	28	0.5	5	250
CXSD62113\|C	TQFN3x3-20	COT	1	2	15	6	25	2	N	550
CXSD62113E	TQFN 3x3 20	COT	2	2	11	6	25	2	N	550
CXSD62114	TQFN3x3-20	COT	2	2	11	5.5	25	2	N	280
CXSD62115	QFN4x4-24	VM	2	1	60	3.1	13.2	0.85	12	5000
CXSD62116A\|B\|C	SOP-8P	VM	1	1	20	2.9	13.2	0.8	12	16000
CXSD62117	SOP-20	VM	2	2	30	10	13.2	1	12	5000
CXSD62118	TDFN3x3-10	COT	1	1	25	1.8	28	0.7	5	250
CXSD62119	TQFN3x3-20	COT	2	1	40	1.8	25	REFIN Setting	5	700
CXSD62120	QFN 3x3 20 TQFN 3x3 16	COT	1	2	20	3	28	1.8\|1.5 1.35\|1.2 0.5	5	800
CXSD62121A	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121B	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121	TQFN3x3-20	COT	1	2	20	3	28	0.75	5	180

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下一篇：CXSD62102A单相定时同步的PWM控制器驱动N通道mosfet功率因数调制（PFM）或脉宽调制（PWM）模式下都能瞬态响应和准确的直流电压输出

单相定时同步的PWM控制器CXSD62102驱动N通道mosfet瞬态响应和准确的直流电压以PFM或PWM模式输出

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