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LT3804EFE Datasheet

  • LT3804EFE

  • Secondary Side Dual Output Controller with Opto Driver

  • 16頁(yè)

  • LINER

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Final Electrical Specifications
LT3804
Secondary Side Dual
Output Controller with Opto Driver
FEATURES
s
s
DESCRIPTIO
June 2003
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
廬
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
LT3804 is synchronized to the falling edge of the trans-
former secondary winding and can be used in single-
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.
APPLICATIO S
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.
TYPICAL APPLICATIO
V
IN
36V
TO 72V
V
CC
BIAS
L1
1.8碌H
0.003鈩?/div>
LT3804
SYNC
CL1N
CL1P
V
CC
CSET
390pF
PGND
TGATE
SW
BGATE
Q2
x2
Q1
L2
1.8碌H
0.003鈩?/div>
鈥?/div>
鈥?/div>
Q4
OUT2
LTC1693-1
Q3
x2
OUT1
IN1 IN2
V
OS1
鈥?/div>
TG
BG
GNDS1
604鈩?/div>
CL2P
CL2N
V
AOUT2
2.74k
V
FB1
V
FB2
V
AOUT1
OPTO
GNDS2
3804 F01
鈥?/div>
鈥?/div>
V
OS1
+
LT3781
SG
鈥?/div>
V
C
+
鈥?/div>
V
REF
V
FB
鈥?/div>
1.5k
ISOLATION
BOUNDARY
C
OUT1
, C
OUT2
: SANYO POSCAP 4TPE680MF 680碌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.
U
V
OS1
+
V
OS1
鈥?/div>
U
U
+
V
OUT1
3.3V
AT 15A
C
OUT1
+
V
OUT2
1.8V
AT 15A
C
OUT2
3.01k
1

LT3804EFE 產(chǎn)品屬性

  • LT3804

  • 50

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流/電壓模式

  • 2

  • 570kHz

  • 80%

  • 8 V ~ 25 V

  • 是

  • 無

  • 無

  • 無

  • 無

  • 無

  • 無

  • 是

  • -40°C ~ 125°C

  • 28-SOIC（0.173"，4.40mm 寬）裸露焊盤

  • 管件

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