首页 > SI9136_11

SI9136_11

更新时间：2025-06-29 10:19:17
品牌：VISHAY
描述：Multi-Output Power-Supply Controller

PDF下载

中文翻译

免费 PCB/SMT

SI9136_11 概述

Multi-Output Power-Supply Controller 多路输出电源控制器

SI9136_11 数据手册

通过下载SI9136_11数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。

PDF下载
Not recommended for new designs, please refer to Si9138  
Si9136  
Vishay Siliconix  
Multi-Output Power-Supply Controller  
DESCRIPTION  
FEATURES  
•
•
•
•
•
•
•
•
Up to 95 % Efficiency  
The Si9136 is a current-mode PWM and PSM converter  
controller, with two synchronous buck converters (3.3 V and  
5 V) and a flyback (non-isolated buck-boost) converter  
(12 V). Designed for portable devices, it offers a total five  
power outputs (three tightly regulated dc/dc converter  
outputs, a precision 3.3 V reference and a 5 V LDO output).  
It requires minimum external components and is capable of  
achieving conversion efficiencies approaching 95 %.  
The Si9136 is available in a 28-pin SSOP package and  
specified to operate over the extended commercial (0 °C to  
90 °C) temperature range.  
3 % Total Regulation (Each Controller)  
5.5 V to 30 V Input Voltage Range  
3.3 V, 5 V, and 12 V Outputs  
200 kHz Low-Noise Fixed Frequency Operation  
Precision 3.3 V Reference Output  
30 mA Linear Regulator Output  
High Efficiency Pulse Skipping Mode Operation at  
Light Load  
•
•
•
•
•
Only Three Inductors Required - No Transformer  
LITTLE FOOT® Optimized Output Drivers  
Internal Soft-Start  
Minimal External Control Components  
28-Pin SSOP Package  
FUNCTIONAL BLOCK DIAGRAM  
V
IN  
5 V  
Linear  
Regulator  
3.3 V  
Voltage  
Reference  
V
REF  
(+ 3.3 V)  
V
L
(5.0 V)  
3.3 V  
SMPS  
5 V  
SMPS  
+ 3.3 V  
+ 5 V  
+ 12 V  
12 V SMPS  
Control  
Inputs  
Power-Up Control  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
1
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
ABSOLUTE MAXIMUM RATINGS  
Parameter  
Limit  
- 0.3 to + 36 V  
2
Unit  
V
IN to GND  
PGND to GND  
V
VL to GND  
- 0.3 to + 6.5 V  
- 0.3 V to + 36 V  
Continuous  
BST3, BST5, BSTFY to GND  
VL Short to GND  
LX3 to BST3; LX5 to BST5; LXFY to BST  
Inputs/Outputs to GND (CS3, CS5, CSP, CSN)  
5 ON/OFF, 3 ON/OFF, 12 ON/OFF  
DL3, DL5 to PGND  
- 6.5 V to 0.3 V  
- 0.3 V to (VL + 0.3 V)  
- 0.3 V to + 5.5 V  
- 0.3 V to (VL + 0.3 V)  
Input of Flyback  
- 0.3 V to (BSTX + 0.3 V)  
572  
V
DLFY to PGND  
DH3 to LX3, DH5 to LX5, DHFY to LXFY  
Continuous Power Dissipation (TA = 90 °C)a  
Operating Temperature Range  
V
28-Pin SSOPb  
mW  
0 °C to 90 °C  
- 40 °C to 125 °C  
300  
°C  
Storage Temperature Range  
Lead Temperature (Soldering, 10 Sec.)  
Notes:  
a. Device Mounted with all leads soldered or welded to PC board.  
b. Derate 9.25 mW/°C above 90 °C.  
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation  
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum  
rating conditions for extended periods may affect device reliability.  
SPECIFICATIONS  
Specific Test Conditions  
Limits  
Typ.b  
V
IN = 15 V , IVL = IREF = 0 mA  
Parameter  
Unit  
Min.a  
Max.a  
TA = 0 °C to 90 °C, All Converters ON  
3.3 V Buck Controller  
Total Regulation (Line, Load, and Temperature)  
Line Regulation  
V
V
IN = 6 to 30 V, 0 < VCS3 - VFB3 < 90 mV  
3.23  
3.33  
3.43  
0.5  
V
V
IN = 6 to 30 V  
0 < VCS3 - VFB3 < 90 mV  
CS3 - VFB3  
L = 10 µH, C = 330 µF  
SENSE = 20 m  
%
Load Regulation  
0.5  
Current Limit  
V
90  
125  
50  
160  
mV  
kHz  
°
Bandwidth  
Phase Margin  
R
65  
5 V Buck Controller  
Total Regulation (Line, Load, and Temperature)  
Line Regulation  
IN = 6 to 30 V, 0 < VCS5 - VFB5 < 90 mV  
IN = 6 to 30 V  
0 < VCS5 - VFB5 < 90 mV  
CS5 - VFB5  
L = 10 µH, C = 330 µF  
SENSE = 20 m  
4.88  
90  
5.03  
5.18  
0.5  
V
V
%
Load Regulation  
0.5  
Current Limit  
V
125  
50  
160  
mV  
kHz  
°
Bandwidth  
Phase Margin  
R
65  
12 V Flyback Controller  
Total Regulation (Line, Load, and Temperature)  
Line Regulation  
V
IN = 6 to 30 V, 0 < VCSP - VCSN < 300 mV  
IN = 6 to 30 V  
0 < VCSP - VFBN < 300 mV  
CSP - VCSN  
11.4  
330  
12.0  
12.6  
0.5  
V
V
%
Load Regulation  
0.5  
Current Limit  
V
410  
10  
500  
mV  
kHz  
°
Bandwidth  
L = 10 µH, C = 100 µF  
Phase Margin  
R
SENSE = 100 m, Ccomp = 120 pF  
65  
Internal Regulator  
VL Output  
All Converters OFF, VIN > 5.5, 0 < IL < 30 mA  
4.7  
3.6  
5.5  
4.2  
V
VL Fault Lockout Voltage  
VL Fault Lockout Hysteresis  
VL /FB5 Switchover Voltage  
VL /FB5 Switchover Hysteresis  
75  
75  
mV  
V
4.2  
4.7  
mV  
www.vishay.com  
2
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
SPECIFICATIONS  
Specific Test Conditions  
Limits  
Unit  
V
IN = 15 V , IVL = IREF = 0 mA  
Parameter  
Min.a  
Typ.b  
Max.a  
TA = 0 °C to 90 °C, All Converters ON  
Reference  
REF Output  
No External Load  
0 to 1 mA  
3.24  
3.30  
30  
3.36  
75  
V
REF Load Regulation  
Supply Current  
mV  
Supply Current-Shutdown  
Supply Current-Operation  
Oscillator  
All Converters OFF, No Load  
35  
60  
µA  
All Converters ON, No Load, FOCS = 200 kHz  
1100  
1800  
Oscillator Frequency  
180  
92  
200  
95  
220  
kHz  
%
Maximum Duty Cycle  
Outputs  
Gate Driver Sink/Source Current (Buck)  
Gate Driver On-Resistance (Buck)  
Gate Driver Sink/Source Current (Flyback)  
Gate Driver On-Resistance (Flyback)  
5 ON/OFF, 3 ON/OFF, and 12 ON/OFF  
VIL  
DL3, DH3, DL5, DH5 Forced to 2 V  
High or Low  
1
2
A
A
7
DHFY, DLFY Forced to 2 V  
High or Low  
0.2  
15  
0.8  
V
VIH  
2.4  
Notes:  
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.  
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.  
PIN CONFIGURATION  
SSOP-28  
ORDERING DESCRIPTION  
VOUT  
Part Number  
Temperature Range  
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
Si9136LG  
0 °C to 90 °C  
3.3 V, 5 V, 12 V  
3
Evaluation Board  
Temperature Range  
Board Type  
4
Si9136DB  
0 °C to 90 °C  
Surface Mount  
5
6
7
8
9
10  
11  
12  
12  
14  
Top View  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
3
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
PIN DESCRIPTION  
Pin Number  
Symbol  
Description  
CS3  
1
Current sense input for 3.3 V buck.  
2
FBFY  
BSTFY  
DHFY  
LXFY  
DLFY  
CSP  
Feedback for flyback.  
3
Boost capacitor connection for flyback converter.  
Gate-drive output for flyback high-side MOSFET.  
Inductor connection for flyback converter.  
Gate-drive output for flyback low-side MOSFET.  
Current sense positive input for flyback converter.  
4
5
6
7
8
CSN  
Current sense negative input for flyback converter.  
Analog ground.  
9
GND  
10  
11  
12  
13  
14  
15  
16  
17  
COMP  
REF  
Flyback compensation connection, if required.  
3.3 V internal reference.  
12 ON/OFF ON and OFF control input for 12 V flyback controller.  
3.3 ON/OFF ON and OFF control input for 3.3 V buck controller.  
5 ON/OFF ON and OFF control input for 5 V buck controller.  
CS5  
Current sense input for 5 V buck controller.  
Inductor connection for buck 5 V.  
DH5  
LX5  
Gate-drive output for 5 V buck high-side MOSFET.  
BST5  
18  
19  
20  
21  
Boost capacitor connection for 5 V buck converter.  
Gate-drive output for 5 V buck low-side MOSFET.  
Power ground.  
DL5  
PGND  
FB5  
Feedback for 5 V buck.  
VL  
22  
23  
24  
25  
26  
27  
28  
5 V logic supply voltage for internal circuitry.  
Input voltage  
VIN  
DL3  
Gate-drive output for 3.3 V buck low-side MOSFET.  
Boost capacitor connection for 3.3 V buck converter.  
Inductor connection for 3.3 V buck low-side MOSFET.  
Gate-drive output for 3.3 V buck high-side MOSFET.  
Feedback for 3.3 V buck.  
BST3  
LX3  
DH3  
FB3  
www.vishay.com  
4
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted)  
100  
100  
90  
Frequency = 200 kHz  
= 6 V  
Frequency = 200 kHz  
90  
V
IN  
V
IN  
= 6 V  
15 V  
15 V  
80  
70  
60  
80  
70  
60  
30 V  
30 V  
5 V On, 12 V Off  
3.3 V Off, 12 V Off  
50  
50  
0.001  
0.01  
0.1  
1
10  
0.001  
0.01  
0.1  
Current (A)  
Efficiency vs. 5.0 V Output Current  
1
10  
Current (A)  
Efficiency vs. 3.3 V Output Current  
85  
V
IN  
= 15 V  
Frequency = 200 kHz  
80  
75  
70  
65  
6 V  
30 V  
5 V On, 3.3 V Off  
60  
55  
0.001  
0.01  
Current (A)  
Efficiency vs. 12 V Output Current  
0.1  
1
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
5
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
TYPICAL WAVEFORMS  
Ch1: V  
OUT  
Ch1: V  
OUT  
Ch2: Load  
Current (1 A/div)  
Ch2: Load  
Current (1 A/div)  
PWM Unloading  
PWM Loading  
5 V Converter (VIN = 10 V)  
5 V Converter (VIN = 10 V)  
Ch1: V  
OUT  
Ch1: V  
OUT  
Ch2: Load  
Current (1 A/div)  
Ch2: Load  
Current (1 A/div)  
Õ
PSM PWM  
PWM Õ PSM  
5 V Converter (VIN = 10 V)  
5 V Converter (VIN = 10 V)  
Ch2: V  
OUT  
Ch2: V  
OUT  
Ch3: Inductor  
Node  
(L X5)  
Ch3: Inductor  
Node  
(L X5)  
Ch4: Inductor  
Current (1A/div)  
Ch4: Inductor  
Current (1A/div)  
PWM Operation  
PSM Operation  
5 V Converter (VIN = 10 V)  
5 V Converter (VIN = 10 V)  
www.vishay.com  
6
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
TYPICAL WAVEFORMS  
Ch1: V  
Ch1: V  
OUT  
OUT  
Ch2: Load  
Current (1 A/div)  
Ch2: Load  
Current (1 A/div)  
PWM, Loading  
PWM, Unloading  
3 V Converter (VIN = 10 V)  
3 V Converter (VIN = 10 V)  
Ch1:  
Ch1:  
V
OUT  
V
OUT  
Ch2: Load  
Current (1 A/div)  
Ch2: Load  
Current (1 A/div)  
PWM Õ PSM  
PSM Õ PWM  
3 V Converter (VIN = 10 V)  
3 V Converter (VIN = 10 V)  
3.3 V Output  
5 V Output  
Ch1: V  
OUT  
12 V Output  
Inductor Current,  
5 V Converter  
(2 A/div)  
Ch4: Load  
Current  
(100 mA/div)  
250 mA Transient  
12 V Converter (VIN = 10 V)  
Start-Up  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
7
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
STANDARD APPLICATION CIRCUIT  
V
IN  
+ 5 V up to 30 mA  
C7  
33 µF  
D1  
CMPD2836  
D2  
CMPD2836  
C5  
4.7 µF  
C4  
33 µF  
V
IN  
V
L
C1  
0.1 µF  
C2  
0.1 µF  
BST  
BST  
3
5
Q2  
Si4416DY  
L1, 10 µH  
R
7
DH5  
LX  
R
cs1  
Q1  
Si4416DY  
0.02 Ω  
+ 5 V  
DH3  
LX  
5
C3  
330 µF  
3
Q4  
Si4812DY  
R
1
L2  
10 µH  
R
cs2  
DL5  
0.02 Ω  
+ 3.3 V  
Q3  
Si4812DY  
DL3  
CS  
FB  
5
C6  
330 µF  
5
D3  
CMPD2836  
C8  
CS  
3
C9  
4.7 µF  
BSTFY  
0.1 µF  
Q5  
DHFY  
LXFY  
Si2304DS  
+ 12 V 0 to  
250 mA  
L3, 10 µH  
D4, D1FS4  
C10  
100 µF  
D5, D1FS4  
FB3  
Q6  
Si2304DS  
DLFY  
CSP  
5 ON/OFF  
R
R
6
cs3  
3.3 ON/OFF  
12 ON/OFF  
CSN  
FBFY  
+ 3.3 V up  
to 1 mA  
REF  
COMP  
PGND  
GND  
C11  
1 µF  
C12  
120 pF  
Figure 1.  
www.vishay.com  
8
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
TIMING DIAGRAMS  
The converter is enabled  
ON/OFF  
V
IN  
is applied  
V
IN  
LDO is activated  
after V is applied  
IN  
V
L
REF circuit is activated  
after V becomes  
available  
2.4 V  
L
V
REF  
After V  
goes above  
REF  
2.4 V, the converter is  
turned on  
OSC EN  
(Sysmon EN)  
Oscillator is activated  
OSC  
Slow soft-start gradually  
increases the maximum  
inductor current  
4 ms  
f
(SS)  
DH  
max  
High-side gate drive duty  
ratio gradually increases  
to maximum  
t
BBM  
Low-side gate drive  
D
L
Figure 2. Converter is Enabled Before VIN is Applied  
The converter is  
enabled  
ON/OFF  
V
IN  
is applied  
V
IN  
LDO is activated  
after V is applied  
IN  
V
L
REF circuit is activated  
after V becomes  
available  
L
2.4 V  
V
REF  
After V  
goes above  
REF  
2.4 V, the converter is  
turned on  
OSC EN  
(Sysmon EN)  
Oscillator is activated  
OSC  
4 ms  
Slow soft-start gradually  
increases the maximum  
inductor current  
f
(SS)  
DH  
DL  
max  
Figure 3. Converter is Enabled After VIN is Applied  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
9
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
TIMING DIAGRAMS  
V
IN  
≈
V (V )  
L
V
L
4 V  
3.4 V  
RESET  
V
REF  
OSC EN  
(Sysmon EN)  
OSC  
D
H
D
L
f
(SS)  
max  
Figure 4. Power Off Sequence  
www.vishay.com  
10  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
DETAIL FUNCTIONAL BLOCK DIAGRAM  
FB  
5
CS_  
FB_  
+
-
1X  
R
R
X
Internal voltage  
divider is only  
used on 5 V  
output.  
Error  
Amplifier  
Y
-
5/3 ON/OFF_  
BST_  
PWMCMP  
+
REF  
-
DH  
DH  
+
Logic  
Control  
Pulse  
Skipping  
Control  
LX_  
SLC  
BBM  
DL  
20 mV  
V
L
Current  
Limit  
DL  
V
Soft-Start  
SYNC  
Rectifier Control  
t
Figure 5. Buck Block Diagram  
FBFY  
R1  
R2  
ON/OFF  
Error  
Amplifier  
PWM  
Comparator  
BSTY  
-
-
Logic  
Control  
DH  
REF  
+
+
LXFY  
COMP  
DHFY  
DLFY  
C/S  
Amplifier  
Pulse  
Skipping  
Control  
DL  
ICSP  
ICSN  
-
+
-
100 mV  
+
Current Limit  
V
Soft-Start  
t
Figure 6. PWM Flyback Block Diagram  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
DETAIL FUNCTIONAL BLOCK DIAGRAM  
5 V  
Linear  
Regulator  
V
IN  
FB  
5
CS  
5
5 V  
Buck  
BST  
5
5 ON/OFF  
3 ON/OFF  
12 ON/OFF  
Controller  
DH5  
LX  
5
V
L
4.5 V  
DL5  
4 V  
FB  
3
CS  
3
Logic  
3.3 V  
Buck  
Controller  
Control  
BST  
3.3 V  
3
Reference  
DH3  
LX  
2.4 V  
3
DL3  
FYBFY  
ICSP  
12 V  
Flyback  
Controller  
ICSN  
BSTFY  
DHFY  
LXFY  
DLFY  
Figure 7. Complete Si9136 Block Diagram  
DESCRIPTION OF OPERATION  
Start-up Sequence  
Switch-mode supply output current capabilities depend on  
external components (can be selected to exceed 10 A). In  
the standard application circuit illustrated in Figure 1, each  
buck converter is capable of delivering 5 A, with the flyback  
converter delivering 250 mA. The recommended load  
currents for the precision 3.3 V reference output is less than  
1 mA, and the 5 V LDO output is less than 30 mA. In order to  
maximize power efficiency of the converter, when the 5 V  
buck converter output (FB5) voltage is above 4.5 V, the  
internal 5 V LDO is turned off and VL is supplied by the 5 V  
converter output.  
Si9136’s outputs are controlled by three specific input control  
lines; 3.3 ON/OFF, 5 ON/OFF, and 12 ON/OFF. Once VIN is  
applied, the VL, the 5 V LDO will come up within its tolerance.  
When any one of these control lines becomes logic high, the  
precision 3.3 V reference will also come up. Immediately  
afterwards, the oscillator will begin and the corresponding  
converter will come up with its own tolerance. In the event of  
all three converters are turned off, the oscillator and the  
reference output will be turned off, and the total system will  
only draw 35 µA of supply current.  
Buck Converter Operation:  
Each converter can soft-start independently. This internal  
soft-start circuitry for each converter will gradually increases  
the inductor maximum peak current during the soft-start  
period (approximately 4 ms), preventing excessive currents  
from being drawn from the input.  
The 3.3 V and 5 V buck converters are both current-mode  
PWM and PSM (during light load operation) regulators using  
high-side bootstrap N-Channel and low-side N-Channel  
MOSFETs. At light load conditions, the converters switch at  
a lower frequency than the clock frequency, seen like some  
clock pulses between the actual switching are skipped, this  
operating condition is defined as pulse-skipping. The  
operation of the converter(s) switching at clock frequency is  
defined as normal operation.  
Si9136 converts a 5.5 V to 30 V input voltage to five different  
output voltages; two buck (step-down) high current, PWM,  
switch-mode supplies of 3.3 V and 5 V, one "flyback" PWM  
switch-mode supply of 12 V, one precision 3.3 V reference  
and one 5 V low drop out (LDO) linear regulator output.  
www.vishay.com  
12  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
DESCRIPTION OF OPERATION (CONT’D)  
Normal Operation: Buck Converters  
It consists of two N-Channel MOSFET switches that are  
turned on and off in phase, and two diodes. Similar to the  
buck converter, during the light load conditions, the flyback  
converter will switch at a frequency lower than the internal  
clock frequency, which can be defined as pulse skipping  
mode (PSM); otherwise, it is operating in normal PWM mode.  
In normal operation, the buck converter high-side MOSFET  
is turned on with a delay (known as break-before-make time  
- tBBM), after the rising edge of the clock. After a certain on  
time, the high-side MOSFET is turned off and then after a  
delay (tBBM), the low-side MOSFET is turned on until the next  
rising edge of the clock, or the inductor current reaches zero.  
The tBBM (approximately 25 ns to 60 ns), has been optimized  
to guarantee the efficiency is not adversely affected at the  
high switching frequency and a specified minimum to  
account for variations of possible MOSFET gate  
capacitances.  
Normal Operation: Flyback Converter  
In normal operation mode, the two MOSFETs are turned on  
at the rising edge of the clock, and then turned off. The on  
time is controlled internally to provide excellent load, line,  
and temperature regulation. The flyback converter has load,  
line and temperature regulation well within 0.5 %.  
During the normal operation, the high-side MOSFET switch  
on-time is controlled internally to provide excellent line and  
load regulation over temperature. Both buck converters  
should have load, line, regulation to within 0.5 % tolerance.  
Pulse Skipping: Flyback Converter  
Under the light load conditions, similar to the buck converter,  
the flyback converter will enter pulse skipping mode. The  
MOSFETs will be turned on until the inductor current  
increases to such a level that the voltage across the pin CSP  
and pin CSN reaches 100 mV, or the on time reaches the  
maximum duty cycle. After the MOSFETs are turned off, the  
inductor current will conduct through two diodes until it  
reaches zero. At this point, the flyback converter output will  
rise slightly above the regulation level, and the converter will  
stay idle for one or several clock cycle(s) until the output falls  
back slightly below the regulation level. The switching losses  
are reduced by skipping pulses and so the efficiency during  
light load is preserved.  
Pulse Skipping: Buck Converters  
When the buck converter switching frequency is less than  
the internal clock frequency, its operation mode is defined as  
pulse skipping mode. During this mode, the high-side  
MOSFET is turned on until VCS-VFB reaches 20 mV, or the  
on time reaches its maximum duty ratio. After the high-side  
MOSFET is turned off, the low-side MOSFET is turned on  
after the tBBM delay, which will remain on until the inductor  
current reaches zero. The output voltage will rise slightly  
above the regulation voltage after this sequence, causing the  
controller to stay idle for the next one, or several clock cycles.  
When the output voltage falls slightly below the regulation  
level, the high-side MOSFET will be turned on again at the  
next clock cycle. With the converter remaining idle during  
some clock cycles, the switching losses are reduced in order  
to preserve conversion efficiency during the light output  
current condition.  
Current Limit: Flyback Converter  
Similar to the buck converter; when the voltage across pin  
CSP and pin CSN exceeds 410 mV typical, the two  
MOSFETs will be turned off regardless of the input and  
output conditions.  
Current Limit: Buck Converters  
Flyback Lowside Drive  
When the buck converter inductor current is too high, the  
voltage across pin CS3(5) and pin FB3(5) exceeds  
approximately 120 mV, the high-side MOSFET would be  
turned off instantaneously regardless of the input, or output  
condition. The Si9136 features clock cycle by clock cycle  
current limiting capability.  
Unlike the gate drive for the two buck converters, the flyback  
lowside gate drive DLFY is powered by a voltage that can be  
as high as 15 V with 20 V input for the flyback converter. If  
this poses concerns on the MOSFET VGS rating, a simple  
resistor-zener circuit can be used: a resistor series with gate  
and zener diode across the gate and source to clamp its  
voltage. A 100 , 10 V combination works well.  
Flyback Converter Operation:  
Designed mainly for PCMCIA or EEPROM programming, the  
Si9136 has a 12 V output non-isolated buck boost converter,  
called for brevity a flyback.  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
www.vishay.com  
13  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Si9136  
Vishay Siliconix  
DESCRIPTION OF OPERATION (CONT’D)  
Grounding:  
efficiency. The converters are current mode control, with a  
bandwidth substantially higher than the LC tank dominant  
pole frequency of the output filter. To ensure stability, the  
minimum capacitance and maximum ESR values are:  
There are two separate grounds on the Si9136, analog  
signal ground (GND) and power ground (PGND). The  
purpose of two separate grounds is to prevent the high  
currents on the power devices (both external and internal)  
from interfering with the analog signals. The internal  
components of Si9136 have their grounds tied (internally)  
together. These two grounds are then tied together  
(externally) at a single point, to ensure Si9136 noise  
immunity.  
VREF  
VOUT x Rcs  
CLOAD  
≥
≤
ESR  
2π x  
x RCS x BW  
VOUT  
VREF  
Where VREF  
= 3.3 V, VOUT is the output voltage  
This separation of grounds should be maintained in the  
external circuitry, with the power ground of all power devices  
being returned directly to the input capacitors, and the small  
signal ground being returned to the GND pin of Si9136.  
(5 V or 3.3 V), Rcs is the current sensing resistor in ohms  
and BW = 50 khz  
With the components specified in the application circuit  
(L = 10 µH, RCS = 0.02 , COUT = 330 µF, ESR  
approximately 0.1 , the converter should have a bandwidth  
at approximately 50 kHz, with minimum phase margin of 65°,  
and dc gain above 50 dB.  
ON/OFF Function  
Logic-low shuts off the appropriate section by disabling the  
gate drive stage. High-side and low-side gate drivers are  
turned off when ON/OFF pins are logic-low. Logic-high  
enables the DH and DL pins.  
Other Outputs  
The Si9136 also provides a 3.3 V reference which can be  
external loaded up to 1 mA, as well as, a 5 V LDO output  
which can be loaded 30 mA, or even more depending on the  
system application. When the 5 V buck converter is turned  
on, the 5 V LDO output is shorted with the 5 V buck converter  
output, so its loading capability is substantially increased.  
For stability, the 3.3 V reference output requires a 1 µF  
capacitor, and 5 V LDO output requires a 4.7 µF capacitor.  
Stability:  
Buck Converters:  
In order to simplify designs, the Si9136 requires no specified  
external components except load capacitors for stability  
control. Meanwhile, it achieves excellent regulation and  
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon  
Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and  
reliability data, see www.vishay.com/ppg?70818.  
www.vishay.com  
14  
Document Number: 70818  
S11-0975-Rev. D, 16-May-11  
This document is subject to change without notice.  
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000  
Package Information  
Vishay Siliconix  
SSOP: 28-LEAD (5.3 MM) (POWER IC ONLY)  
28  
15  
−B−  
E
1
E
1
14  
−A−  
D
e
GAUGE PLANE  
R
c
A
2
A
1
A
−C−  
L
SEATING PLANE  
ꢀ
SEATING PLANE  
0.076  
C
L
1
b
S
M
0.12  
A
B
C
MILLIMETERS  
Dim  
A
A1  
A2  
b
c
D
E
E1  
e
Min  
Nom  
1.88  
Max  
1.99  
0.21  
1.78  
0.38  
0.20  
10.33  
8.00  
5.40  
1.73  
0.05  
1.68  
0.25  
0.09  
10.07  
7.60  
5.20  
0.13  
1.75  
0.30  
0.15  
10.20  
7.80  
5.30  
0.65 BSC  
0.75  
0.63  
0.95  
L
1.25 BSC  
0.15  
L1  
R
0.09  
− − −  
0_  
4_  
8_  
ꢀ
ECN: S-40080—Rev. A, 02-Feb-04  
DWG: 5915  
Document Number: 72810  
28-Jan-04  
www.vishay.com  
1
Legal Disclaimer Notice  
Vishay  
Disclaimer  
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE  
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.  
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,  
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other  
disclosure relating to any product.  
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or  
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all  
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,  
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular  
purpose, non-infringement and merchantability.  
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical  
requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements  
about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular  
product with the properties described in the product specification is suitable for use in a particular application. Parameters  
provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All  
operating parameters, including typical parameters, must be validated for each customer application by the customer’s  
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,  
including but not limited to the warranty expressed therein.  
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining  
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.  
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree  
to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and  
damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay  
or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to  
obtain written terms and conditions regarding products designed for such applications.  
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by  
any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.  
Document Number: 91000  
Revision: 11-Mar-11  
www.vishay.com  
1

SI9136_11 相关器件

型号 制造商 描述 价格 文档
SI9137 VISHAY Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications 获取价格
SI9137DB VISHAY Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications 获取价格
SI9137LG VISHAY Multi-Output, Sequence Selectable Power-Supply Controller for Mobile Applications 获取价格
SI9137LG-T1 VISHAY IC SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO28, SSOP-28, Switching Regulator or Controller 获取价格
SI9138 VISHAY Multi-Output, Individual On/Off Control Power-Supply Controller 获取价格
SI9138DB VISHAY Multi-Output, Individual On/Off Control Power-Supply Controller 获取价格
SI9138LG VISHAY Multi-Output, Individual On/Off Control Power-Supply Controller 获取价格
SI9138LG-E3 VISHAY Switching Regulator/Controller, Current-mode, 0.03A, 330kHz Switching Freq-Max, PDSO28, 获取价格
SI9139 VISHAY Multi-Output, Individual On/Off Control Power-Supply Controller 获取价格
SI9139DG VISHAY Multi-Output, Individual On/Off Control Power-Supply Controller 获取价格

SI9136_11 相关文章

  • 探究法拉电容：如何精准计算存储电量
    2025-07-02
    4
  • 2025 年内存行业：关键战役打响，谁能脱颖而出
    2025-07-02
    9
  • 突破光刻限制：更大光罩引领半导体制造新变革
    2025-07-01
    53
  • 台积电、三星逐鹿 1nm 工艺，半导体产业风云变幻
    2025-07-01
    25

    • 热门型号

  • 1N5930
  • 1N5942B
  • 1N4001
  • MBR3050CT
  • RTA02-8D
  • 4116T
  • 5KP43A/4
  • 1N5260A
  • MC79L05
  • BZX85C30
  • 9510-G
  • W2PE-54WZ-P
  • 1N6063
  • 2SA673
  • 20IMX35
    • Hi,有什么可以帮您？ 在线客服 或 微信扫码咨询
  • 概述
  • 数据手册
    • 2025 ICPDF网 联系我们和版权申明:QQ 272164286