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参数资料
| 型号： | SI9122EDQ-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM VM 20-TSSOP |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 95% |
| 电源电压： | 10.5 V ~ 13.2 V |
| 降压： | 无 |
| 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 ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
Si9122E
Vishay Siliconix
V CC
V I N
12 V
Pre-Reg u lator
V REF
Bandgap
Reference
3.3 V
V REG
9.1 V
+
–
9.1 V
V I N DET
C L_CO N T
+
–
V REF
V U V
V U V LO
+
–
8 . 8 V
High-Side
Primary
Dri v er
+
–
V SD
BST
R OSC
Fre qu ency
Fold b ack
OSC
V oltage
Feedfor w ard
550 m V
V SD
135 °C Temp
Protection
V U V V U V LO
High V oltage
Interface
DH
LX
Oscillator
Clock
OTP
EP
60 k
132 k
–
+
Clock
–
+
Logic
Logic
V CC
Lo w -Side
Primary
Dri v er
DL
V REF /2
P W M
Generator
PG N D
CS2
C u rrent
Control
+
Gain
Loop
Timer
V CC
Synchrono u s
CS1
C L_CO N T
–
100 m V
V CC
Control
Blanking
V CC
Dri v er
(High)
Synchrono u s
Dri v er
(Lo w )
SR H
SR L
SS
8V
20 μA
Soft-Start
Si9122E
SS Ena b le
BBM
G N D
Figure 4. Detailed Si9122E Block Diagram
DETAILED OPTION
Start-Up
When V INEXT rises above 0 V, the internal pre-regulator
begins to charge up the V CC capacitor. Current into the
external V CC capacitor is limited to typically 40 mA by the
internal DMOS device. When V CC exceeds the UVLO
voltage of 8.8 V a soft-start cycle of the switch mode supply
is initiated. The V CC supply continues to be charged by the
pre-regulator until V CC equals V REG . During this period,
between V UVLO and V REG , excessive load current will result
in V CC falling below V UVLO and stopping switch mode
operation. This situation is avoided by the hysteresis
between V REG and V UVLO and correct sizing of the V CC
capacitor, bootstrap capacitor and the soft-start capacitor.
The value of the V CC capacitor should therefore be chosen
to be capable of maintaining switch mode operation until the
required V CC current can be supplied from the external circuit
(e.g via a power transformer winding and zener regulator).
Feedback from the output of the switch mode supply charges
V CC above V REG and fully disconnects the pre-regulator,
www.vishay.com
8
isolating V CC from V IN . V CC is then maintained above V REG
for the duration of switch mode operation. In the event of an
over voltage condition on V CC , an internal voltage clamp
turns on at 14.5 V to shunt excessive current to GND.
Care needs to be taken if there is a delay prior to the external
circuit feeding back to the V CC supply. To prevent excessive
power dissipation within the IC it is advisable to use an
external PNP device. A pin has been incorporated on the IC,
(REG_COMP) to provide compensation when employing the
external device. In this case the V IN pin is connected to the
base of the PNP device and controls the current, while the
REG_COMP pin determines the frequency compensation of
the circuit. The value of the REG_COMP capacitor cannot be
too big, otherwise it will slow down the response of the
pre-regulator in the case that fault situations occur and
pre-regulator needs to be turned on again. To understand
the operation, please refer to figure 5.
Document Number: 73866
S-80112-Rev. D, 21-Jan-08
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