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RT7736DGE 其他数据使用手册 - Richtek（立锜）
制造商:
Richtek（立锜）
分类:
DC/DC转换器
封装:
SOT-23-6
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3D模型
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RT7736DGE数据手册
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5
DS7736-04 September 2014
RT7736
www.richtek.com
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Figure 2. Block Diagram for RT7736B, RT7736D and RT7736F
Counter
VDD
GATE
LEB
R
S
Q
X3
Slope
Ramp
Burst Switching Green
Mode
COMP
V
BURH
V
BURL
PWM
Comparator
Shutdown
Logic
COMP Open
Sensing
Dmax
Oscillator
POR
27V
Bias &
Bandgap
UVLO
OVP
9V/14.5V
Constant
Power
Soft Driver
+
-
+
-
+
-
-
+
-
2V
Secondary Rectifier
Short Protection
COMP
CS
BNO
GND
V
DD
5.2V
OTP
V
BIN_TH
/V
BNO_TH
OLP
+
-
T
OLP
: 56ms (RT7736B)
T
OLP
: 88ms (RT7736D)
T
OLP
: 64ms (RT7736F)
Operation
Burst Switching Green Mode
The burst mode is designed to reduce switching loss.
When the output load reduces, and the V
COMP
drops and
reaches V
BURL
, the controller will cease switching. After
output voltage decreases and the V
COMP
goes up to V
BURH
,
the switching will be resumed.
VDD Holdup Mode
Under very light load conditions, the V
DD
may drop down
to turn-off threshold voltage. To avoid this situation when
V
DD
drops to a set threshold, V
DD_ET
, the hysteresis
comparator will bypass PWM and burst mode loop, and
then force switching at a very low level to supply energy
to VDD pin. VDD holdup mode is also improved to hold up
V
DD
by less switching cycles. This mode is very useful
for reducing start-up resistor loss and keeping start-up
time within specification. This function makes bias winding
design and transient design easier.
Oscillator
The oscillator runs at 65kHz and features frequency
jittering function. Its jittering depth is Δf with about T
JIT
envelope frequency at f
OSC
. It also generates slope
compensation saw-tooth, maximum duty cycle pulse and
overload protection slope.
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