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参数资料
| 型号： | LT3804EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 28-TSSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 570kHz |
| 占空比： | 80% |
| 电源电压： | 8 V ~ 25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
Final Electrical Specifications
LT3804
Secondary Side Dual
Output Controller with Opto Driver
FEATURES
DESCRIPTIO
June 2003
s
s
s
s
s
s
s
s
Regulates Two Secondary Outputs
Optocoupler Feedback Driver and Second Output
Synchronous Driver Controller
True Differential Remote Sensing Regulation
High Switching Frequency: up to 800kHz
Programmable Current Limit
Programmable Soft-Start and Power Good
Automatic Frequency Synchronization
Available in Thermally Enhanced 28-Lead TSSOP
The LT ? 3804 is a high efficiency step-down switching
regulator with optocoupler feedback control for regulating
multiple outputs in single-secondary winding isolated
power supplies.
The LT3804 contains an error amplifier and an optocoupler
driver to regulate the first (main) output. For the second
output regulation, the LT3804 contains a complete PWM
controller to drive dual synchronous N-channel MOSFETs.
With leading edge modulation, it operates with either
current or voltage mode control of the primary side. The
APPLICATIO S
LT3804 is synchronized to the falling edge of the trans-
former secondary winding and can be used in single-
s
s
s
s
48V Input Isolated DC/DC Converters
Multiple Output Power Supplies
Offline Converters
DC/DC Power Modules
, LTC and LT are registered trademarks of Linear Technology Corporation.
ended or double-ended isolated power converter topolo-
gies. A user selectable discontinuous conduction mode
improves light load efficiency.
True differential Kelvin sensing is used for each output
feedback amplifier to achieve high regulation accuracy
and design simplicity. Other features include soft start,
current limit and power good flags.
TYPICAL APPLICATIO
V OUT1
V IN
36V
TO 72V
V CC
BIAS
L1
1.8 μ H
0.003 ?
LT3804
CL1N SYNC
V OS1 +
V OS1 –
+
3.3V
AT 15A
C OUT1
?
?
Q4
OUT2
LTC1693-1
CL1P
V CC
TGATE
SW
Q1
L2
1.8 μ H
0.003 ?
+
V OUT2
1.8V
AT 15A
Q3
x2
OUT1
IN1 IN2
390pF
CSET
BGATE
Q2
x2
C OUT2
PGND
V OS1 –
GNDS1
TG
BG
?
?
604 ?
CL2P
CL2N
V C
LT3781
+
–
SG
V REF
V FB
?
?
V OS1 +
2.74k
V FB1
V AOUT1
OPTO
V AOUT2
V FB2
GNDS2
1.5k
3.01k
3804 F01
ISOLATION
BOUNDARY
C OUT1 , C OUT2 : SANYO POSCAP 4TPE680MF 680 μ F/4V
L1, L2: SUMIDA CEP125-IR8MC-H
Q1-Q4: SILICONIX Si7892DP
Figure 1. 250kHz, 3.3V and 1.8V Output Isolated DC/DC Converter (Simplified Schematic)
3804i
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
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